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/*
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.codemodel.internal.fmt;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.text.ParseException;
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import java.util.Iterator;
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import java.util.List;
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import com.sun.codemodel.internal.JClass;
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import com.sun.codemodel.internal.JPackage;
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import com.sun.codemodel.internal.JResourceFile;
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import com.sun.codemodel.internal.JTypeVar;
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/**
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* Statically generated Java soruce file.
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*
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* <p>
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* This {@link JResourceFile} implementation will generate a Java source
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* file by copying the source code from a resource.
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* <p>
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* While copying a resource, we look for a package declaration and
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* replace it with the target package name. This allows the static Java
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* source code to have an arbitrary package declaration.
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* <p>
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* You can also use the getJClass method to obtain a {@link JClass}
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* object that represents the static file. This allows the client code
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* to refer to the class from other CodeModel generated code.
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* <p>
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* Note that because we don't parse the static Java source code,
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* the returned {@link JClass} object doesn't respond to methods like
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* "isInterface" or "_extends",
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*
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* @author
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* Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
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*/
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public final class JStaticJavaFile extends JResourceFile {
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private final JPackage pkg;
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private final String className;
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private final ResourceLoader source;
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private final JStaticClass clazz;
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private final LineFilter filter;
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public JStaticJavaFile(JPackage _pkg, String _className, Class<?> loadingClass, LineFilter _filter) {
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super(_className + ".java");
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if (loadingClass == null) throw new NullPointerException();
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this.pkg = _pkg;
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this.clazz = new JStaticClass();
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this.className = _className;
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this.source = new ResourceLoader(_className, loadingClass);
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this.filter = _filter;
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}
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/**
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* Returns a class object that represents a statically generated code.
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*/
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public final JClass getJClass() {
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return clazz;
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}
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protected boolean isResource() {
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return false;
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}
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protected void build(OutputStream os) throws IOException {
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int lineNumber=1;
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try (
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InputStream is = source.getResourceAsStream();
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BufferedReader r = new BufferedReader(new InputStreamReader(is));
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PrintWriter w = new PrintWriter(new BufferedWriter(new OutputStreamWriter(os)));
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) {
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LineFilter filter = createLineFilter();
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String line;
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while((line=r.readLine())!=null) {
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line = filter.process(line);
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if(line!=null)
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w.println(line);
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lineNumber++;
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}
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} catch( ParseException e ) {
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throw new IOException("unable to process "+source+" line:"+lineNumber+"\n"+e.getMessage());
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}
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}
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/**
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* Creates a {@link LineFilter}.
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* <p>
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* A derived class can override this method to process
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* the contents of the source file.
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*/
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private LineFilter createLineFilter() {
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// this filter replaces the package declaration.
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LineFilter f = new LineFilter() {
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public String process(String line) {
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if(!line.startsWith("package ")) return line;
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// replace package decl
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if( pkg.isUnnamed() )
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return null;
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else
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return "package "+pkg.name()+";";
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}
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};
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if( filter!=null )
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return new ChainFilter(filter,f);
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else
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return f;
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}
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/**
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* Filter that alters the Java source code.
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* <p>
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* By implementing this interface, derived classes
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* can modify the Java source file before it's written out.
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*/
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public interface LineFilter {
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/**
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* @param line
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* a non-null valid String that corresponds to one line.
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* No '\n' included.
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* @return
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* null to strip the line off. Otherwise the returned
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* String will be written out. Do not add '\n' at the end
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* of this string.
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*
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* @exception ParseException
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* when for some reason there's an error in the line.
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*/
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String process(String line) throws ParseException;
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}
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/**
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* A {@link LineFilter} that combines two {@link LineFilter}s.
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*/
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public final static class ChainFilter implements LineFilter {
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private final LineFilter first,second;
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public ChainFilter( LineFilter first, LineFilter second ) {
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this.first=first;
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this.second=second;
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}
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public String process(String line) throws ParseException {
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line = first.process(line);
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if(line==null) return null;
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return second.process(line);
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}
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}
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private class JStaticClass extends JClass {
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private final JTypeVar[] typeParams;
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JStaticClass() {
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super(pkg.owner());
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// TODO: allow those to be specified
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typeParams = new JTypeVar[0];
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}
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public String name() {
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return className;
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}
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public String fullName() {
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if(pkg.isUnnamed())
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return className;
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else
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return pkg.name()+'.'+className;
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}
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public JPackage _package() {
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return pkg;
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}
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public JClass _extends() {
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throw new UnsupportedOperationException();
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}
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public Iterator<JClass> _implements() {
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throw new UnsupportedOperationException();
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}
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public boolean isInterface() {
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throw new UnsupportedOperationException();
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}
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public boolean isAbstract() {
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throw new UnsupportedOperationException();
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}
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public JTypeVar[] typeParams() {
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return typeParams;
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}
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protected JClass substituteParams(JTypeVar[] variables, List<JClass> bindings) {
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return this;
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}
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}
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static class ResourceLoader {
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Class<?> loadingClass;
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String shortName;
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ResourceLoader(String shortName, Class<?> loadingClass) {
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this.loadingClass = loadingClass;
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this.shortName = shortName;
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}
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InputStream getResourceAsStream() {
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// some people didn't like our jars to contain files with .java extension,
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// so when we build jars, we'' use ".java_". But when we run from the workspace,
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// we want the original source code to be used, so we check both here.
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// see bug 6211503.
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InputStream stream = loadingClass.getResourceAsStream(shortName + ".java");
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if (stream == null) {
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stream = loadingClass.getResourceAsStream(shortName + ".java_");
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}
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if (stream == null) {
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throw new InternalError("Unable to load source code of " + loadingClass.getName() + " as a resource");
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}
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return stream;
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}
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}
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}
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