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*
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* 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
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*
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/*
*******************************************************************************
* (C) Copyright IBM Corp. and others, 1996-2009 - All Rights Reserved *
* *
* The original version of this source code and documentation is copyrighted *
* and owned by IBM, These materials are provided under terms of a License *
* Agreement between IBM and Sun. This technology is protected by multiple *
* US and International patents. This notice and attribution to IBM may not *
* to removed. *
*******************************************************************************
* file name: UBiDiProps.java
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2005jan16
* created by: Markus W. Scherer
*
* Low-level Unicode bidi/shaping properties access.
* Java port of ubidi_props.h/.c.
*/
package sun.text.normalizer;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.InputStream;
import java.io.IOException;
public final class UBiDiProps {
// constructors etc. --------------------------------------------------- ***
// port of ubidi_openProps()
public UBiDiProps() throws IOException{
InputStream is=ICUData.getStream(DATA_FILE_NAME);
BufferedInputStream b=new BufferedInputStream(is, 4096 /* data buffer size */);
readData(b);
b.close();
is.close();
}
private void readData(InputStream is) throws IOException {
DataInputStream inputStream=new DataInputStream(is);
// read the header
ICUBinary.readHeader(inputStream, FMT, new IsAcceptable());
// read indexes[]
int i, count;
count=inputStream.readInt();
if(count<IX_INDEX_TOP) {
throw new IOException("indexes[0] too small in "+DATA_FILE_NAME);
}
indexes=new int[count];
indexes[0]=count;
for(i=1; i<count; ++i) {
indexes[i]=inputStream.readInt();
}
// read the trie
trie=new CharTrie(inputStream, null);
// read mirrors[]
count=indexes[IX_MIRROR_LENGTH];
if(count>0) {
mirrors=new int[count];
for(i=0; i<count; ++i) {
mirrors[i]=inputStream.readInt();
}
}
// read jgArray[]
count=indexes[IX_JG_LIMIT]-indexes[IX_JG_START];
jgArray=new byte[count];
for(i=0; i<count; ++i) {
jgArray[i]=inputStream.readByte();
}
}
// implement ICUBinary.Authenticate
private final class IsAcceptable implements ICUBinary.Authenticate {
public boolean isDataVersionAcceptable(byte version[]) {
return version[0]==1 &&
version[2]==Trie.INDEX_STAGE_1_SHIFT_ && version[3]==Trie.INDEX_STAGE_2_SHIFT_;
}
}
// UBiDiProps singleton
private static UBiDiProps gBdp=null;
// port of ubidi_getSingleton()
public static final synchronized UBiDiProps getSingleton() throws IOException {
if(gBdp==null) {
gBdp=new UBiDiProps();
}
return gBdp;
}
// UBiDiProps dummy singleton
private static UBiDiProps gBdpDummy=null;
private UBiDiProps(boolean makeDummy) { // ignore makeDummy, only creates a unique signature
indexes=new int[IX_TOP];
indexes[0]=IX_TOP;
trie=new CharTrie(0, 0, null); // dummy trie, always returns 0
}
/**
* Get a singleton dummy object, one that works with no real data.
* This can be used when the real data is not available.
* Using the dummy can reduce checks for available data after an initial failure.
* Port of ucase_getDummy().
*/
public static final synchronized UBiDiProps getDummy() {
if(gBdpDummy==null) {
gBdpDummy=new UBiDiProps(true);
}
return gBdpDummy;
}
public final int getClass(int c) {
return getClassFromProps(trie.getCodePointValue(c));
}
// data members -------------------------------------------------------- ***
private int indexes[];
private int mirrors[];
private byte jgArray[];
private CharTrie trie;
// data format constants ----------------------------------------------- ***
private static final String DATA_FILE_NAME = "/sun/text/resources/ubidi.icu";
/* format "BiDi" */
private static final byte FMT[]={ 0x42, 0x69, 0x44, 0x69 };
/* indexes into indexes[] */
private static final int IX_INDEX_TOP=0;
private static final int IX_MIRROR_LENGTH=3;
private static final int IX_JG_START=4;
private static final int IX_JG_LIMIT=5;
private static final int IX_TOP=16;
private static final int CLASS_MASK= 0x0000001f;
private static final int getClassFromProps(int props) {
return props&CLASS_MASK;
}
}