| /* |
| * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0, which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package com.sun.codemodel.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.text.ParseException; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import com.sun.codemodel.JClass; |
| import com.sun.codemodel.JPackage; |
| import com.sun.codemodel.JResourceFile; |
| import com.sun.codemodel.JTypeVar; |
| |
| /** |
| * Statically generated Java soruce file. |
| * |
| * <p> |
| * This {@link JResourceFile} implementation will generate a Java source |
| * file by copying the source code from a resource. |
| * <p> |
| * 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. |
| * <p> |
| * 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. |
| * <p> |
| * 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 ResourceLoader source; |
| private final JStaticClass clazz; |
| private final LineFilter filter; |
| |
| public JStaticJavaFile(JPackage _pkg, String _className, Class<?> loadingClass, LineFilter _filter) { |
| super(_className + ".java"); |
| if (loadingClass == null) throw new NullPointerException(); |
| this.pkg = _pkg; |
| this.clazz = new JStaticClass(); |
| this.className = _className; |
| this.source = new ResourceLoader(_className, loadingClass); |
| this.filter = _filter; |
| } |
| |
| /** |
| * Returns a class object that represents a statically generated code. |
| */ |
| public JClass getJClass() { |
| return clazz; |
| } |
| |
| @Override |
| protected boolean isResource() { |
| return false; |
| } |
| |
| @Override |
| protected void build(OutputStream os) throws IOException { |
| int lineNumber=1; |
| try ( |
| InputStream is = source.getResourceAsStream(); |
| BufferedReader r = new BufferedReader(new InputStreamReader(is)); |
| PrintWriter w = new PrintWriter(new BufferedWriter(new OutputStreamWriter(os))) |
| ) { |
| LineFilter filter = createLineFilter(); |
| 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()); |
| } |
| } |
| |
| /** |
| * Creates a {@link LineFilter}. |
| * <p> |
| * 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() { |
| @Override |
| 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. |
| * <p> |
| * 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; |
| } |
| @Override |
| 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]; |
| } |
| |
| @Override |
| public String name() { |
| return className; |
| } |
| |
| @Override |
| public String fullName() { |
| if(pkg.isUnnamed()) |
| return className; |
| else |
| return pkg.name()+'.'+className; |
| } |
| |
| @Override |
| public JPackage _package() { |
| return pkg; |
| } |
| |
| @Override |
| public JClass _extends() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Iterator<JClass> _implements() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean isInterface() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean isAbstract() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public JTypeVar[] typeParams() { |
| return typeParams; |
| } |
| |
| @Override |
| protected JClass substituteParams(JTypeVar[] variables, List<JClass> bindings) { |
| return this; |
| } |
| } |
| |
| static class ResourceLoader { |
| Class<?> loadingClass; |
| String shortName; |
| |
| ResourceLoader(String shortName, Class<?> loadingClass) { |
| this.loadingClass = loadingClass; |
| this.shortName = shortName; |
| } |
| |
| InputStream getResourceAsStream() { |
| // some people didn't like our jars to contain files with .java extension, |
| // so when we build jars, we'' use ".java_". But when we run from the workspace, |
| // we want the original source code to be used, so we check both here. |
| // see bug 6211503. |
| InputStream stream = loadingClass.getResourceAsStream(shortName + ".java"); |
| if (stream == null) { |
| stream = loadingClass.getResourceAsStream(shortName + ".java_"); |
| } |
| if (stream == null) { |
| throw new InternalError("Unable to load source code of " + loadingClass.getName() + " as a resource"); |
| } |
| return stream; |
| } |
| |
| } |
| |
| } |