/* * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * 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. */ package com.sun.codemodel.internal.fmt; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.URL; import java.text.ParseException; import java.util.Iterator; import java.util.List; import com.sun.codemodel.internal.JClass; import com.sun.codemodel.internal.JPackage; import com.sun.codemodel.internal.JResourceFile; import com.sun.codemodel.internal.JTypeVar; /** * Statically generated Java soruce file. * *
* This {@link JResourceFile} implementation will generate a Java source * file by copying the source code from a resource. *
* While copying a resource, we look for a package declaration and * replace it with the target package name. This allows the static Java * source code to have an arbitrary package declaration. *
* You can also use the getJClass method to obtain a {@link JClass} * object that represents the static file. This allows the client code * to refer to the class from other CodeModel generated code. *
* Note that because we don't parse the static Java source code, * the returned {@link JClass} object doesn't respond to methods like * "isInterface" or "_extends", * * @author * Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com) */ public final class JStaticJavaFile extends JResourceFile { private final JPackage pkg; private final String className; private final URL source; private final JStaticClass clazz; private final LineFilter filter; public JStaticJavaFile(JPackage _pkg, String className, String _resourceName) { this( _pkg, className, JStaticJavaFile.class.getClassLoader().getResource(_resourceName), null ); } public JStaticJavaFile(JPackage _pkg, String _className, URL _source, LineFilter _filter ) { super(_className+".java"); if(_source==null) throw new NullPointerException(); this.pkg = _pkg; this.clazz = new JStaticClass(); this.className = _className; this.source = _source; this.filter = _filter; } /** * Returns a class object that represents a statically generated code. */ public final JClass getJClass() { return clazz; } protected boolean isResource() { return false; } protected void build(OutputStream os) throws IOException { InputStream is = source.openStream(); BufferedReader r = new BufferedReader(new InputStreamReader(is)); PrintWriter w = new PrintWriter(new BufferedWriter(new OutputStreamWriter(os))); LineFilter filter = createLineFilter(); int lineNumber=1; try { String line; while((line=r.readLine())!=null) { line = filter.process(line); if(line!=null) w.println(line); lineNumber++; } } catch( ParseException e ) { throw new IOException("unable to process "+source+" line:"+lineNumber+"\n"+e.getMessage()); } w.close(); r.close(); } /** * Creates a {@link LineFilter}. *
* A derived class can override this method to process * the contents of the source file. */ private LineFilter createLineFilter() { // this filter replaces the package declaration. LineFilter f = new LineFilter() { public String process(String line) { if(!line.startsWith("package ")) return line; // replace package decl if( pkg.isUnnamed() ) return null; else return "package "+pkg.name()+";"; } }; if( filter!=null ) return new ChainFilter(filter,f); else return f; } /** * Filter that alters the Java source code. *
* By implementing this interface, derived classes
* can modify the Java source file before it's written out.
*/
public interface LineFilter {
/**
* @param line
* a non-null valid String that corresponds to one line.
* No '\n' included.
* @return
* null to strip the line off. Otherwise the returned
* String will be written out. Do not add '\n' at the end
* of this string.
*
* @exception ParseException
* when for some reason there's an error in the line.
*/
String process(String line) throws ParseException;
}
/**
* A {@link LineFilter} that combines two {@link LineFilter}s.
*/
public final static class ChainFilter implements LineFilter {
private final LineFilter first,second;
public ChainFilter( LineFilter first, LineFilter second ) {
this.first=first;
this.second=second;
}
public String process(String line) throws ParseException {
line = first.process(line);
if(line==null) return null;
return second.process(line);
}
}
private class JStaticClass extends JClass {
private final JTypeVar[] typeParams;
JStaticClass() {
super(pkg.owner());
// TODO: allow those to be specified
typeParams = new JTypeVar[0];
}
public String name() {
return className;
}
public String fullName() {
if(pkg.isUnnamed())
return className;
else
return pkg.name()+'.'+className;
}
public JPackage _package() {
return pkg;
}
public JClass _extends() {
throw new UnsupportedOperationException();
}
public Iterator