/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* The abstract class <code>URLConnection</code> is the superclass
* of all classes that represent a communications link between the
* application and a URL. Instances of this class can be used both to
* read from and to write to the resource referenced by the URL. In
* general, creating a connection to a URL is a multistep process:
* <p>
* <center><table border=2 summary="Describes the process of creating a connection to a URL: openConnection() and connect() over time.">
* <tr><th><code>openConnection()</code></th>
* <th><code>connect()</code></th></tr>
* <tr><td>Manipulate parameters that affect the connection to the remote
* resource.</td>
* <td>Interact with the resource; query header fields and
* contents.</td></tr>
* </table>
* ---------------------------->
* <br>time</center>
*
* <ol>
* <li>The connection object is created by invoking the
* <code>openConnection</code> method on a URL.
* <li>The setup parameters and general request properties are manipulated.
* <li>The actual connection to the remote object is made, using the
* <code>connect</code> method.
* <li>The remote object becomes available. The header fields and the contents
* of the remote object can be accessed.
* </ol>
* <p>
* The setup parameters are modified using the following methods:
* <ul>
* <li><code>setAllowUserInteraction</code>
* <li><code>setDoInput</code>
* <li><code>setDoOutput</code>
* <li><code>setIfModifiedSince</code>
* <li><code>setUseCaches</code>
* </ul>
* <p>
* and the general request properties are modified using the method:
* <ul>
* <li><code>setRequestProperty</code>
* </ul>
* <p>
* Default values for the <code>AllowUserInteraction</code> and
* <code>UseCaches</code> parameters can be set using the methods
* <code>setDefaultAllowUserInteraction</code> and
* <code>setDefaultUseCaches</code>.
* <p>
* Each of the above <code>set</code> methods has a corresponding
* <code>get</code> method to retrieve the value of the parameter or
* general request property. The specific parameters and general
* request properties that are applicable are protocol specific.
* <p>
* The following methods are used to access the header fields and
* the contents after the connection is made to the remote object:
* <ul>
* <li><code>getContent</code>
* <li><code>getHeaderField</code>
* <li><code>getInputStream</code>
* <li><code>getOutputStream</code>
* </ul>
* <p>
* Certain header fields are accessed frequently. The methods:
* <ul>
* <li><code>getContentEncoding</code>
* <li><code>getContentLength</code>
* <li><code>getContentType</code>
* <li><code>getDate</code>
* <li><code>getExpiration</code>
* <li><code>getLastModifed</code>
* </ul>
* <p>
* provide convenient access to these fields. The
* <code>getContentType</code> method is used by the
* <code>getContent</code> method to determine the type of the remote
* object; subclasses may find it convenient to override the
* <code>getContentType</code> method.
* <p>
* In the common case, all of the pre-connection parameters and
* general request properties can be ignored: the pre-connection
* parameters and request properties default to sensible values. For
* most clients of this interface, there are only two interesting
* methods: <code>getInputStream</code> and <code>getContent</code>,
* which are mirrored in the <code>URL</code> class by convenience methods.
* <p>
* More information on the request properties and header fields of
* an <code>http</code> connection can be found at:
* <blockquote><pre>
* </pre></blockquote>
*
* Note about <code>fileNameMap</code>: In versions prior to JDK 1.1.6,
* field <code>fileNameMap</code> of <code>URLConnection</code> was public.
* In JDK 1.1.6 and later, <code>fileNameMap</code> is private; accessor
* and mutator methods {@link #getFileNameMap() getFileNameMap} and
* {@link #setFileNameMap(java.net.FileNameMap) setFileNameMap} are added
* to access it. This change is also described on the <a href=
* Compatibility</a> page.
*
* Invoking the <tt>close()</tt> methods on the <tt>InputStream</tt> or <tt>OutputStream</tt> of an
* <tt>URLConnection</tt> after a request may free network resources associated with this
* instance, unless particular protocol specifications specify different behaviours
* for it.
*
* @author James Gosling
* @see java.net.URL#openConnection()
* @see java.net.URLConnection#connect()
* @see java.net.URLConnection#getContent()
* @see java.net.URLConnection#getContentEncoding()
* @see java.net.URLConnection#getContentLength()
* @see java.net.URLConnection#getContentType()
* @see java.net.URLConnection#getDate()
* @see java.net.URLConnection#getExpiration()
* @see java.net.URLConnection#getHeaderField(int)
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @see java.net.URLConnection#getInputStream()
* @see java.net.URLConnection#getLastModified()
* @see java.net.URLConnection#getOutputStream()
* @see java.net.URLConnection#setAllowUserInteraction(boolean)
* @see java.net.URLConnection#setDefaultUseCaches(boolean)
* @see java.net.URLConnection#setDoInput(boolean)
* @see java.net.URLConnection#setDoOutput(boolean)
* @see java.net.URLConnection#setIfModifiedSince(long)
* @see java.net.URLConnection#setRequestProperty(java.lang.String, java.lang.String)
* @see java.net.URLConnection#setUseCaches(boolean)
* @since JDK1.0
*/
public abstract class URLConnection {
/**
* The URL represents the remote object on the World Wide Web to
* which this connection is opened.
* <p>
* The value of this field can be accessed by the
* <code>getURL</code> method.
* <p>
* The default value of this variable is the value of the URL
* argument in the <code>URLConnection</code> constructor.
*
* @see java.net.URLConnection#getURL()
* @see java.net.URLConnection#url
*/
/**
* This variable is set by the <code>setDoInput</code> method. Its
* value is returned by the <code>getDoInput</code> method.
* <p>
* <code>doInput</code> flag to <code>true</code> indicates that
* the application intends to read data from the URL connection.
* <p>
* The default value of this field is <code>true</code>.
*
* @see java.net.URLConnection#getDoInput()
* @see java.net.URLConnection#setDoInput(boolean)
*/
protected boolean doInput = true;
/**
* This variable is set by the <code>setDoOutput</code> method. Its
* value is returned by the <code>getDoOutput</code> method.
* <p>
* <code>doOutput</code> flag to <code>true</code> indicates
* that the application intends to write data to the URL connection.
* <p>
* The default value of this field is <code>false</code>.
*
* @see java.net.URLConnection#getDoOutput()
* @see java.net.URLConnection#setDoOutput(boolean)
*/
protected boolean doOutput = false;
private static boolean defaultAllowUserInteraction = false;
/**
* If <code>true</code>, this <code>URL</code> is being examined in
* a context in which it makes sense to allow user interactions such
* as popping up an authentication dialog. If <code>false</code>,
* then no user interaction is allowed.
* <p>
* The value of this field can be set by the
* <code>setAllowUserInteraction</code> method.
* Its value is returned by the
* <code>getAllowUserInteraction</code> method.
* Its default value is the value of the argument in the last invocation
* of the <code>setDefaultAllowUserInteraction</code> method.
*
* @see java.net.URLConnection#getAllowUserInteraction()
* @see java.net.URLConnection#setAllowUserInteraction(boolean)
* @see java.net.URLConnection#setDefaultAllowUserInteraction(boolean)
*/
private static boolean defaultUseCaches = true;
/**
* If <code>true</code>, the protocol is allowed to use caching
* whenever it can. If <code>false</code>, the protocol must always
* try to get a fresh copy of the object.
* <p>
* This field is set by the <code>setUseCaches</code> method. Its
* value is returned by the <code>getUseCaches</code> method.
* <p>
* Its default value is the value given in the last invocation of the
* <code>setDefaultUseCaches</code> method.
*
* @see java.net.URLConnection#setUseCaches(boolean)
* @see java.net.URLConnection#getUseCaches()
* @see java.net.URLConnection#setDefaultUseCaches(boolean)
*/
/**
* Some protocols support skipping the fetching of the object unless
* the object has been modified more recently than a certain time.
* <p>
* A nonzero value gives a time as the number of milliseconds since
* January 1, 1970, GMT. The object is fetched only if it has been
* modified more recently than that time.
* <p>
* This variable is set by the <code>setIfModifiedSince</code>
* method. Its value is returned by the
* <code>getIfModifiedSince</code> method.
* <p>
* The default value of this field is <code>0</code>, indicating
* that the fetching must always occur.
*
* @see java.net.URLConnection#getIfModifiedSince()
* @see java.net.URLConnection#setIfModifiedSince(long)
*/
/**
* If <code>false</code>, this connection object has not created a
* communications link to the specified URL. If <code>true</code>,
* the communications link has been established.
*/
protected boolean connected = false;
/**
* @since 1.5
*/
private int connectTimeout;
private int readTimeout;
/**
* @since 1.6
*/
/**
* @since JDK1.1
*/
/**
* @since 1.2.2
*/
private static boolean fileNameMapLoaded = false;
/**
* Loads filename map (a mimetable) from a data file. It will
* first try to load the user-specific table, defined
* by "content.types.user.table" property. If that fails,
* it tries to load the default built-in table at
* lib/content-types.properties under java home.
*
* @return the FileNameMap
* @since 1.2
* @see #setFileNameMap(java.net.FileNameMap)
*/
fileNameMapLoaded = true;
}
return new FileNameMap() {
}
};
}
/**
* Sets the FileNameMap.
* <p>
* If there is a security manager, this method first calls
* the security manager's <code>checkSetFactory</code> method
* to ensure the operation is allowed.
* This could result in a SecurityException.
*
* @param map the FileNameMap to be set
* @exception SecurityException if a security manager exists and its
* <code>checkSetFactory</code> method doesn't allow the operation.
* @see SecurityManager#checkSetFactory
* @see #getFileNameMap()
* @since 1.2
*/
fileNameMap = map;
}
/**
* Opens a communications link to the resource referenced by this
* URL, if such a connection has not already been established.
* <p>
* If the <code>connect</code> method is called when the connection
* has already been opened (indicated by the <code>connected</code>
* field having the value <code>true</code>), the call is ignored.
* <p>
* URLConnection objects go through two phases: first they are
* created, then they are connected. After being created, and
* before being connected, various options can be specified
* (e.g., doInput and UseCaches). After connecting, it is an
* error to try to set them. Operations that depend on being
* connected, like getContentLength, will implicitly perform the
* connection, if necessary.
*
* @throws SocketTimeoutException if the timeout expires before
* the connection can be established
* @exception IOException if an I/O error occurs while opening the
* connection.
* @see java.net.URLConnection#connected
* @see #getConnectTimeout()
* @see #setConnectTimeout(int)
*/
/**
* Sets a specified timeout value, in milliseconds, to be used
* when opening a communications link to the resource referenced
* by this URLConnection. If the timeout expires before the
* connection can be established, a
* java.net.SocketTimeoutException is raised. A timeout of zero is
* interpreted as an infinite timeout.
* <p> Some non-standard implmentation of this method may ignore
* the specified timeout. To see the connect timeout set, please
* call getConnectTimeout().
*
* @param timeout an <code>int</code> that specifies the connect
* timeout value in milliseconds
* @throws IllegalArgumentException if the timeout parameter is negative
*
* @see #getConnectTimeout()
* @see #connect()
* @since 1.5
*/
if (timeout < 0) {
throw new IllegalArgumentException("timeout can not be negative");
}
}
/**
* Returns setting for connect timeout.
* <p>
* 0 return implies that the option is disabled
* (i.e., timeout of infinity).
*
* @return an <code>int</code> that indicates the connect timeout
* value in milliseconds
* @see #setConnectTimeout(int)
* @see #connect()
* @since 1.5
*/
public int getConnectTimeout() {
return connectTimeout;
}
/**
* Sets the read timeout to a specified timeout, in
* milliseconds. A non-zero value specifies the timeout when
* reading from Input stream when a connection is established to a
* resource. If the timeout expires before there is data available
* for read, a java.net.SocketTimeoutException is raised. A
* timeout of zero is interpreted as an infinite timeout.
*
*<p> Some non-standard implementation of this method ignores the
* specified timeout. To see the read timeout set, please call
* getReadTimeout().
*
* @param timeout an <code>int</code> that specifies the timeout
* value to be used in milliseconds
* @throws IllegalArgumentException if the timeout parameter is negative
*
* @see #getReadTimeout()
* @see InputStream#read()
* @since 1.5
*/
if (timeout < 0) {
throw new IllegalArgumentException("timeout can not be negative");
}
}
/**
* Returns setting for read timeout. 0 return implies that the
* option is disabled (i.e., timeout of infinity).
*
* @return an <code>int</code> that indicates the read timeout
* value in milliseconds
*
* @see #setReadTimeout(int)
* @see InputStream#read()
* @since 1.5
*/
public int getReadTimeout() {
return readTimeout;
}
/**
* Constructs a URL connection to the specified URL. A connection to
* the object referenced by the URL is not created.
*
* @param url the specified URL.
*/
}
/**
* Returns the value of this <code>URLConnection</code>'s <code>URL</code>
* field.
*
* @return the value of this <code>URLConnection</code>'s <code>URL</code>
* field.
* @see java.net.URLConnection#url
*/
return url;
}
/**
* Returns the value of the <code>content-length</code> header field.
* <P>
* <B>Note</B>: {@link #getContentLengthLong() getContentLengthLong()}
* should be preferred over this method, since it returns a {@code long}
* instead and is therefore more portable.</P>
*
* @return the content length of the resource that this connection's URL
* references, {@code -1} if the content length is not known,
* or if the content length is greater than Integer.MAX_VALUE.
*/
public int getContentLength() {
long l = getContentLengthLong();
return -1;
return (int) l;
}
/**
* Returns the value of the <code>content-length</code> header field as a
* long.
*
* @return the content length of the resource that this connection's URL
* references, or <code>-1</code> if the content length is
* not known.
* @since 7.0
*/
public long getContentLengthLong() {
}
/**
* Returns the value of the <code>content-type</code> header field.
*
* @return the content type of the resource that the URL references,
* or <code>null</code> if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
*/
return getHeaderField("content-type");
}
/**
* Returns the value of the <code>content-encoding</code> header field.
*
* @return the content encoding of the resource that the URL references,
* or <code>null</code> if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
*/
return getHeaderField("content-encoding");
}
/**
* Returns the value of the <code>expires</code> header field.
*
* @return the expiration date of the resource that this URL references,
* or 0 if not known. The value is the number of milliseconds since
* January 1, 1970 GMT.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
*/
public long getExpiration() {
}
/**
* Returns the value of the <code>date</code> header field.
*
* @return the sending date of the resource that the URL references,
* or <code>0</code> if not known. The value returned is the
* number of milliseconds since January 1, 1970 GMT.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
*/
public long getDate() {
}
/**
* Returns the value of the <code>last-modified</code> header field.
* The result is the number of milliseconds since January 1, 1970 GMT.
*
* @return the date the resource referenced by this
* <code>URLConnection</code> was last modified, or 0 if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
*/
public long getLastModified() {
}
/**
* Returns the value of the named header field.
* <p>
* If called on a connection that sets the same header multiple times
* with possibly different values, only the last value is returned.
*
*
* @param name the name of a header field.
* @return the value of the named header field, or <code>null</code>
* if there is no such field in the header.
*/
return null;
}
/**
* Returns an unmodifiable Map of the header fields.
* The Map keys are Strings that represent the
* response-header field names. Each Map value is an
* unmodifiable List of Strings that represents
* the corresponding field values.
*
* @return a Map of header fields
* @since 1.4
*/
return Collections.EMPTY_MAP;
}
/**
* Returns the value of the named field parsed as a number.
* <p>
* This form of <code>getHeaderField</code> exists because some
* connection types (e.g., <code>http-ng</code>) have pre-parsed
* headers. Classes for that connection type can override this method
* and short-circuit the parsing.
*
* @param name the name of the header field.
* @param Default the default value.
* @return the value of the named field, parsed as an integer. The
* <code>Default</code> value is returned if the field is
* missing or malformed.
*/
try {
} catch (Exception e) { }
return Default;
}
/**
* Returns the value of the named field parsed as a number.
* <p>
* This form of <code>getHeaderField</code> exists because some
* connection types (e.g., <code>http-ng</code>) have pre-parsed
* headers. Classes for that connection type can override this method
* and short-circuit the parsing.
*
* @param name the name of the header field.
* @param Default the default value.
* @return the value of the named field, parsed as a long. The
* <code>Default</code> value is returned if the field is
* missing or malformed.
* @since 7.0
*/
try {
} catch (Exception e) { }
return Default;
}
/**
* Returns the value of the named field parsed as date.
* The result is the number of milliseconds since January 1, 1970 GMT
* represented by the named field.
* <p>
* This form of <code>getHeaderField</code> exists because some
* connection types (e.g., <code>http-ng</code>) have pre-parsed
* headers. Classes for that connection type can override this method
* and short-circuit the parsing.
*
* @param name the name of the header field.
* @param Default a default value.
* @return the value of the field, parsed as a date. The value of the
* <code>Default</code> argument is returned if the field is
* missing or malformed.
*/
try {
} catch (Exception e) { }
return Default;
}
/**
* Returns the key for the <code>n</code><sup>th</sup> header field.
* It returns <code>null</code> if there are fewer than <code>n+1</code> fields.
*
* @param n an index, where n>=0
* @return the key for the <code>n</code><sup>th</sup> header field,
* or <code>null</code> if there are fewer than <code>n+1</code>
* fields.
*/
return null;
}
/**
* Returns the value for the <code>n</code><sup>th</sup> header field.
* It returns <code>null</code> if there are fewer than
* <code>n+1</code>fields.
* <p>
* This method can be used in conjunction with the
* {@link #getHeaderFieldKey(int) getHeaderFieldKey} method to iterate through all
* the headers in the message.
*
* @param n an index, where n>=0
* @return the value of the <code>n</code><sup>th</sup> header field
* or <code>null</code> if there are fewer than <code>n+1</code> fields
* @see java.net.URLConnection#getHeaderFieldKey(int)
*/
return null;
}
/**
* Retrieves the contents of this URL connection.
* <p>
* This method first determines the content type of the object by
* calling the <code>getContentType</code> method. If this is
* the first time that the application has seen that specific content
* type, a content handler for that content type is created:
* <ol>
* <li>If the application has set up a content handler factory instance
* using the <code>setContentHandlerFactory</code> method, the
* <code>createContentHandler</code> method of that instance is called
* with the content type as an argument; the result is a content
* handler for that content type.
* <li>If no content handler factory has yet been set up, or if the
* factory's <code>createContentHandler</code> method returns
* <code>null</code>, then the application loads the class named:
* <blockquote><pre>
* sun.net.www.content.<<i>contentType</i>>
* </pre></blockquote>
* where <<i>contentType</i>> is formed by taking the
* content-type string, replacing all slash characters with a
* <code>period</code> ('.'), and all other non-alphanumeric characters
* with the underscore character '<code>_</code>'. The alphanumeric
* characters are specifically the 26 uppercase ASCII letters
* '<code>A</code>' through '<code>Z</code>', the 26 lowercase ASCII
* letters '<code>a</code>' through '<code>z</code>', and the 10 ASCII
* digits '<code>0</code>' through '<code>9</code>'. If the specified
* class does not exist, or is not a subclass of
* <code>ContentHandler</code>, then an
* <code>UnknownServiceException</code> is thrown.
* </ol>
*
* @return the object fetched. The <code>instanceof</code> operator
* should be used to determine the specific kind of object
* returned.
* @exception IOException if an I/O error occurs while
* getting the content.
* @exception UnknownServiceException if the protocol does not support
* the content type.
* @see java.net.ContentHandlerFactory#createContentHandler(java.lang.String)
* @see java.net.URLConnection#getContentType()
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
*/
// Must call getInputStream before GetHeaderField gets called
// so that FileNotFoundException has a chance to be thrown up
// from here without being caught.
return getContentHandler().getContent(this);
}
/**
* Retrieves the contents of this URL connection.
*
* @param classes the <code>Class</code> array
* indicating the requested types
* @return the object fetched that is the first match of the type
* specified in the classes array. null if none of
* the requested types are supported.
* The <code>instanceof</code> operator should be used to
* determine the specific kind of object returned.
* @exception IOException if an I/O error occurs while
* getting the content.
* @exception UnknownServiceException if the protocol does not support
* the content type.
* @see java.net.URLConnection#getContent()
* @see java.net.ContentHandlerFactory#createContentHandler(java.lang.String)
* @see java.net.URLConnection#getContent(java.lang.Class[])
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
* @since 1.3
*/
// Must call getInputStream before GetHeaderField gets called
// so that FileNotFoundException has a chance to be thrown up
// from here without being caught.
}
/**
* Returns a permission object representing the permission
* necessary to make the connection represented by this
* object. This method returns null if no permission is
* required to make the connection. By default, this method
* returns <code>java.security.AllPermission</code>. Subclasses
* should override this method and return the permission
* that best represents the permission required to make a
* a connection to the URL. For example, a <code>URLConnection</code>
* representing a <code>file:</code> URL would return a
* <code>java.io.FilePermission</code> object.
*
* <p>The permission returned may dependent upon the state of the
* connection. For example, the permission before connecting may be
* different from that after connecting. For example, an HTTP
* sever, say foo.com, may redirect the connection to a different
* host, say bar.com. Before connecting the permission returned by
* the connection will represent the permission needed to connect
* to foo.com, while the permission returned after connecting will
* be to bar.com.
*
* <p>Permissions are generally used for two purposes: to protect
* caches of objects obtained through URLConnections, and to check
* the right of a recipient to learn about a particular URL. In
* the first case, the permission should be obtained
* <em>after</em> the object has been obtained. For example, in an
* HTTP connection, this will represent the permission to connect
* to the host from which the data was ultimately fetched. In the
* second case, the permission should be obtained and tested
* <em>before</em> connecting.
*
* @return the permission object representing the permission
* necessary to make the connection represented by this
* URLConnection.
*
* @exception IOException if the computation of the permission
* requires network or file I/O and an exception occurs while
* computing it.
*/
return SecurityConstants.ALL_PERMISSION;
}
/**
* Returns an input stream that reads from this open connection.
*
* A SocketTimeoutException can be thrown when reading from the
* returned input stream if the read timeout expires before data
* is available for read.
*
* @return an input stream that reads from this open connection.
* @exception IOException if an I/O error occurs while
* creating the input stream.
* @exception UnknownServiceException if the protocol does not support
* input.
* @see #setReadTimeout(int)
* @see #getReadTimeout()
*/
throw new UnknownServiceException("protocol doesn't support input");
}
/**
* Returns an output stream that writes to this connection.
*
* @return an output stream that writes to this connection.
* @exception IOException if an I/O error occurs while
* creating the output stream.
* @exception UnknownServiceException if the protocol does not support
* output.
*/
throw new UnknownServiceException("protocol doesn't support output");
}
/**
* Returns a <code>String</code> representation of this URL connection.
*
* @return a string representation of this <code>URLConnection</code>.
*/
}
/**
* Sets the value of the <code>doInput</code> field for this
* <code>URLConnection</code> to the specified value.
* <p>
* flag to true if you intend to use the URL connection for input,
* false if not. The default is true.
*
* @param doinput the new value.
* @throws IllegalStateException if already connected
* @see java.net.URLConnection#doInput
* @see #getDoInput()
*/
if (connected)
throw new IllegalStateException("Already connected");
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>doInput</code> flag.
*
* @return the value of this <code>URLConnection</code>'s
* <code>doInput</code> flag.
* @see #setDoInput(boolean)
*/
public boolean getDoInput() {
return doInput;
}
/**
* Sets the value of the <code>doOutput</code> field for this
* <code>URLConnection</code> to the specified value.
* <p>
* flag to true if you intend to use the URL connection for output,
* false if not. The default is false.
*
* @param dooutput the new value.
* @throws IllegalStateException if already connected
* @see #getDoOutput()
*/
if (connected)
throw new IllegalStateException("Already connected");
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>doOutput</code> flag.
*
* @return the value of this <code>URLConnection</code>'s
* <code>doOutput</code> flag.
* @see #setDoOutput(boolean)
*/
public boolean getDoOutput() {
return doOutput;
}
/**
* Set the value of the <code>allowUserInteraction</code> field of
* this <code>URLConnection</code>.
*
* @param allowuserinteraction the new value.
* @throws IllegalStateException if already connected
* @see #getAllowUserInteraction()
*/
if (connected)
throw new IllegalStateException("Already connected");
}
/**
* Returns the value of the <code>allowUserInteraction</code> field for
* this object.
*
* @return the value of the <code>allowUserInteraction</code> field for
* this object.
* @see #setAllowUserInteraction(boolean)
*/
public boolean getAllowUserInteraction() {
return allowUserInteraction;
}
/**
* Sets the default value of the
* <code>allowUserInteraction</code> field for all future
* <code>URLConnection</code> objects to the specified value.
*
* @param defaultallowuserinteraction the new value.
* @see #getDefaultAllowUserInteraction()
*/
}
/**
* Returns the default value of the <code>allowUserInteraction</code>
* field.
* <p>
* Ths default is "sticky", being a part of the static state of all
* URLConnections. This flag applies to the next, and all following
* URLConnections that are created.
*
* @return the default value of the <code>allowUserInteraction</code>
* field.
* @see #setDefaultAllowUserInteraction(boolean)
*/
public static boolean getDefaultAllowUserInteraction() {
return defaultAllowUserInteraction;
}
/**
* Sets the value of the <code>useCaches</code> field of this
* <code>URLConnection</code> to the specified value.
* <p>
* Some protocols do caching of documents. Occasionally, it is important
* to be able to "tunnel through" and ignore the caches (e.g., the
* "reload" button in a browser). If the UseCaches flag on a connection
* is true, the connection is allowed to use whatever caches it can.
* If false, caches are to be ignored.
* The default value comes from DefaultUseCaches, which defaults to
* true.
*
* @param usecaches a <code>boolean</code> indicating whether
* or not to allow caching
* @throws IllegalStateException if already connected
* @see #getUseCaches()
*/
if (connected)
throw new IllegalStateException("Already connected");
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>useCaches</code> field.
*
* @return the value of this <code>URLConnection</code>'s
* <code>useCaches</code> field.
* @see #setUseCaches(boolean)
*/
public boolean getUseCaches() {
return useCaches;
}
/**
* Sets the value of the <code>ifModifiedSince</code> field of
* this <code>URLConnection</code> to the specified value.
*
* @param ifmodifiedsince the new value.
* @throws IllegalStateException if already connected
* @see #getIfModifiedSince()
*/
if (connected)
throw new IllegalStateException("Already connected");
}
/**
* Returns the value of this object's <code>ifModifiedSince</code> field.
*
* @return the value of this object's <code>ifModifiedSince</code> field.
* @see #setIfModifiedSince(long)
*/
public long getIfModifiedSince() {
return ifModifiedSince;
}
/**
* Returns the default value of a <code>URLConnection</code>'s
* <code>useCaches</code> flag.
* <p>
* Ths default is "sticky", being a part of the static state of all
* URLConnections. This flag applies to the next, and all following
* URLConnections that are created.
*
* @return the default value of a <code>URLConnection</code>'s
* <code>useCaches</code> flag.
* @see #setDefaultUseCaches(boolean)
*/
public boolean getDefaultUseCaches() {
return defaultUseCaches;
}
/**
* Sets the default value of the <code>useCaches</code> field to the
* specified value.
*
* @param defaultusecaches the new value.
* @see #getDefaultUseCaches()
*/
}
/**
* Sets the general request property. If a property with the key already
* exists, overwrite its value with the new value.
*
* <p> NOTE: HTTP requires all request properties which can
* legally have multiple instances with the same key
* to use a comma-seperated list syntax which enables multiple
* properties to be appended into a single property.
*
* @param key the keyword by which the request is known
* (e.g., "<code>Accept</code>").
* @param value the value associated with it.
* @throws IllegalStateException if already connected
* @throws NullPointerException if key is <CODE>null</CODE>
* @see #getRequestProperty(java.lang.String)
*/
if (connected)
throw new IllegalStateException("Already connected");
throw new NullPointerException ("key is null");
requests = new MessageHeader();
}
/**
* Adds a general request property specified by a
* key-value pair. This method will not overwrite
* existing values associated with the same key.
*
* @param key the keyword by which the request is known
* (e.g., "<code>Accept</code>").
* @param value the value associated with it.
* @throws IllegalStateException if already connected
* @throws NullPointerException if key is null
* @see #getRequestProperties()
* @since 1.4
*/
if (connected)
throw new IllegalStateException("Already connected");
throw new NullPointerException ("key is null");
requests = new MessageHeader();
}
/**
* Returns the value of the named general request property for this
* connection.
*
* @param key the keyword by which the request is known (e.g., "Accept").
* @return the value of the named general request property for this
* connection. If key is null, then null is returned.
* @throws IllegalStateException if already connected
* @see #setRequestProperty(java.lang.String, java.lang.String)
*/
if (connected)
throw new IllegalStateException("Already connected");
return null;
}
/**
* Returns an unmodifiable Map of general request
* properties for this connection. The Map keys
* are Strings that represent the request-header
* field names. Each Map value is a unmodifiable List
* of Strings that represents the corresponding
* field values.
*
* @return a Map of the general request properties for this connection.
* @throws IllegalStateException if already connected
* @since 1.4
*/
if (connected)
throw new IllegalStateException("Already connected");
return Collections.EMPTY_MAP;
}
/**
* Sets the default value of a general request property. When a
* <code>URLConnection</code> is created, it is initialized with
* these properties.
*
* @param key the keyword by which the request is known
* (e.g., "<code>Accept</code>").
* @param value the value associated with the key.
*
* @see java.net.URLConnection#setRequestProperty(java.lang.String,java.lang.String)
*
* @deprecated The instance specific setRequestProperty method
* should be used after an appropriate instance of URLConnection
* is obtained. Invoking this method will have no effect.
*
* @see #getDefaultRequestProperty(java.lang.String)
*/
}
/**
* Returns the value of the default request property. Default request
* properties are set for every connection.
*
* @param key the keyword by which the request is known (e.g., "Accept").
* @return the value of the default request property
* for the specified key.
*
* @see java.net.URLConnection#getRequestProperty(java.lang.String)
*
* @deprecated The instance specific getRequestProperty method
* should be used after an appropriate instance of URLConnection
* is obtained.
*
* @see #setDefaultRequestProperty(java.lang.String, java.lang.String)
*/
return null;
}
/**
* The ContentHandler factory.
*/
/**
* Sets the <code>ContentHandlerFactory</code> of an
* application. It can be called at most once by an application.
* <p>
* The <code>ContentHandlerFactory</code> instance is used to
* construct a content handler from a content type
* <p>
* If there is a security manager, this method first calls
* the security manager's <code>checkSetFactory</code> method
* to ensure the operation is allowed.
* This could result in a SecurityException.
*
* @param fac the desired factory.
* @exception Error if the factory has already been defined.
* @exception SecurityException if a security manager exists and its
* <code>checkSetFactory</code> method doesn't allow the operation.
* @see java.net.ContentHandlerFactory
* @see java.net.URLConnection#getContent()
* @see SecurityManager#checkSetFactory
*/
throw new Error("factory already defined");
}
}
}
/**
* Gets the Content Handler appropriate for this connection.
* @param connection the connection to use.
*/
throws UnknownServiceException
{
if (contentType == null)
throw new UnknownServiceException("no content-type");
try {
return handler;
} catch(Exception e) {
}
try {
} catch(Exception e) {
e.printStackTrace();
}
}
return handler;
}
/*
* For looking up the content handler, we should ignore those
* parameters.
*/
{
if (contentType == null)
return null;
if (index > 0)
else
return contentType;
}
/**
* Looks for a content handler in a user-defineable set of places.
* By default it looks in sun.net.www.content, but users can define a
* vertical-bar delimited set of class prefixes to search through in
* addition by defining the java.content.handler.pkgs property.
* The class name must be of the form:
* <pre>
* {package-prefix}.{major}.{minor}
* e.g.
* YoyoDyne.experimental.text.plain
* </pre>
*/
while (packagePrefixIter.hasMoreTokens()) {
try {
try {
} catch (ClassNotFoundException e) {
}
}
return handler;
}
} catch(Exception e) {
}
}
return UnknownContentHandler.INSTANCE;
}
/**
* Utility function to map a MIME content type into an equivalent
* be returned as "text.html"
*/
// make sure we canonicalize the class name: all lower case
for (int i = 0; i < len; i++) {
char c = nm[i];
if (c == '/') {
nm[i] = '.';
} else if (!('A' <= c && c <= 'Z' ||
'a' <= c && c <= 'z' ||
'0' <= c && c <= '9')) {
nm[i] = '_';
}
}
}
/**
* Returns a vertical bar separated list of package prefixes for potential
* content handlers. Tries to get the java.content.handler.pkgs property
* to use as a set of package prefixes to search. Whether or not
* that property has been defined, the sun.net.www.content is always
* the last one on the returned package list.
*/
if (packagePrefixList != "") {
packagePrefixList += "|";
}
return packagePrefixList + contentClassPrefix;
}
/**
* Tries to determine the content type of an object, based
* on the specified "file" component of a URL.
* This is a convenience method that can be used by
* subclasses that override the <code>getContentType</code> method.
*
* @param fname a filename.
* @return a guess as to what the content type of the object is,
* based upon its file name.
* @see java.net.URLConnection#getContentType()
*/
}
/**
* Tries to determine the type of an input stream based on the
* characters at the beginning of the input stream. This method can
* be used by subclasses that override the
* <code>getContentType</code> method.
* <p>
* Ideally, this routine would not be needed. But many
* <code>http</code> servers return the incorrect content type; in
* addition, there are many nonstandard extensions. Direct inspection
* of the bytes to determine the content type is often more accurate
* than believing the content type claimed by the <code>http</code> server.
*
* @param is an input stream that supports marks.
* @return a guess at the content type, or <code>null</code> if none
* can be determined.
* @exception IOException if an I/O error occurs while reading the
* input stream.
* @see java.io.InputStream#mark(int)
* @see java.io.InputStream#markSupported()
* @see java.net.URLConnection#getContentType()
*/
throws IOException {
// If we can't read ahead safely, just give up on guessing
if (!is.markSupported())
return null;
return "application/java-vm";
}
// next two bytes are version number, currently 0x00 0x05
return "application/x-java-serialized-object";
}
if (c1 == '<') {
if (c2 == '!'
}
return "application/xml";
}
}
// big and little (identical) endian UTF-8 encodings, with BOM
return "application/xml";
}
}
// big and little endian UTF-16 encodings, with byte order mark
return "application/xml";
}
}
return "application/xml";
}
}
// big and little endian UTF-32 encodings, with BOM
return "application/xml";
}
}
return "application/xml";
}
}
}
}
}
}
if (c4 == 0xE0) {
}
/**
* File format used by digital cameras to store images.
* Exif Format can be read by any application supporting
* JPEG. Exif Spec can be found at:
*/
if ((c4 == 0xE1) &&
c11 == 0)) {
}
if (c4 == 0xEE) {
}
}
/* Above is signature of Microsoft Structured Storage.
* Below this, could have tests for various SS entities.
* For now, just test for FlashPix.
*/
}
}
}
}
/* I don't know if this is official but evidence
* suggests that .wav files start with "RIFF" - brown
*/
}
return null;
}
/**
* Check for FlashPix image data in InputStream is. Return true if
* the stream has FlashPix data, false otherwise. Before calling this
* method, the stream should have already been checked to be sure it
* contains Microsoft Structured Storage data.
*/
/* Test for FlashPix image data in Microsoft Structured Storage format.
* In general, should do this with calls to an SS implementation.
* Lacking that, need to dig via offsets to get to the FlashPix
* ClassID. Details:
*
* Offset to Fpx ClsID from beginning of stream should be:
*
* FpxClsidOffset = rootEntryOffset + clsidOffset
*
* where: clsidOffset = 0x50.
* rootEntryOffset = headerSize + sectorSize*sectDirStart
* + 128*rootEntryDirectory
*
* where: headerSize = 0x200 (always)
* sectorSize = 2 raised to power of uSectorShift,
* which is found in the header at
* offset 0x1E.
* sectDirStart = found in the header at offset 0x30.
* rootEntryDirectory = in general, should search for
* directory labelled as root.
* We will assume value of 0 (i.e.,
* rootEntry is in first directory)
*/
// Mark the stream so we can reset it. 0x100 is enough for the first
// few reads, but the mark will have to be reset and set again once
// the offset to the root directory entry is computed. That offset
// can be very large and isn't know until the stream has been read from
// Get the byte ordering located at 0x1E. 0xFE is Intel,
// 0xFF is other
long toSkip = (long)0x1C;
long posn;
return false;
}
int c[] = new int[16];
return false;
}
int byteOrder = c[0];
posn+=2;
int uSectorShift;
return false;
}
if(byteOrder == 0xFE) {
uSectorShift = c[0];
}
else {
uSectorShift += c[1];
}
posn += 2;
long skipped = 0;
return false;
}
return false;
}
int sectDirStart;
if(byteOrder == 0xFE) {
sectDirStart = c[0];
} else {
sectDirStart += c[3];
}
posn += 4;
// Sanity check!
if (toSkip < 0) {
return false;
}
/*
* How far can we skip? Is there any performance problem here?
* This skip can be fairly long, at least 0x4c650 in at least
* one case. Have to assume that the skip will fit in an int.
* Leave room to read whole root dir
*/
return false;
}
/* should be at beginning of ClassID, which is as follows
* (in Intel byte order):
* 00 67 61 56 54 C1 CE 11 85 53 00 AA 00 A1 F9 5B
*
* This is stored from Windows as long,short,short,char[8]
* so for byte order changes, the order only changes for
* the first 8 bytes in the ClassID.
*
* Test against this, ignoring second byte (Intel) since
* this could change depending on part of Fpx file we have.
*/
return false;
}
// intel byte order
if (byteOrder == 0xFE &&
c[0] == 0x00 && c[2] == 0x61 && c[3] == 0x56 &&
c[4] == 0x54 && c[5] == 0xC1 && c[6] == 0xCE &&
c[7] == 0x11 && c[8] == 0x85 && c[9] == 0x53 &&
c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 &&
c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) {
return true;
}
// non-intel byte order
else if (c[3] == 0x00 && c[1] == 0x61 && c[0] == 0x56 &&
c[5] == 0x54 && c[4] == 0xC1 && c[7] == 0xCE &&
c[6] == 0x11 && c[8] == 0x85 && c[9] == 0x53 &&
c[10]== 0x00 && c[11]== 0xAA && c[12]== 0x00 &&
c[13]== 0xA1 && c[14]== 0xF9 && c[15]== 0x5B) {
return true;
}
return false;
}
/**
* Tries to read the specified number of bytes from the stream
* Returns -1, If EOF is reached before len bytes are read, returns 0
* otherwise
*/
throws IOException {
return -1;
}
// fill the passed in int array
for (int i = 0; i < len; i++) {
c[i] = buf[i] & 0xff;
}
return 0;
}
/**
* Skips through the specified number of bytes from the stream
* until either EOF is reached, or the specified
* number of bytes have been skipped
*/
throws IOException {
long eachSkip = 0;
long skipped = 0;
// check if EOF is reached
if (eachSkip <= 0) {
return skipped ;
} else {
skipped++;
}
}
}
return skipped;
}
}
return uc.getInputStream();
}
}