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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.maven.compiler;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.eclipse.jdt.internal.compiler.env.INameEnvironment;
import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
/**
* An implementation of INameEnvironment based on a ClassLoader.
*
* @version $Rev: $ $Date: $
*/
class ClassLoaderNameEnvironment implements INameEnvironment {
private final static char fileSeparator = System.getProperty("file.separator").charAt(0);
private ClassLoader classLoader;
private List<String> sourceLocations;
private Map<String, File> sourceFiles;
ClassLoaderNameEnvironment(ClassLoader classLoader, List<String> sourceLocations) {
this.classLoader = classLoader;
this.sourceLocations = sourceLocations;
sourceFiles = new HashMap<String, File>();
}
public NameEnvironmentAnswer findType(char[][] compoundTypeName) {
StringBuffer className = new StringBuffer();
for (char[] name: compoundTypeName) {
if (className.length() != 0) {
className.append('.');
}
className.append(name);
}
return nameAnswer(className.toString());
}
public NameEnvironmentAnswer findType(char[] typeName, char[][] packageName) {
StringBuffer className = new StringBuffer();
for (char[] name: packageName) {
if (className.length() != 0) {
className.append('.');
}
className.append(name);
}
if (className.length() != 0) {
className.append('.');
}
className.append(typeName);
return nameAnswer(className.toString());
}
public boolean isPackage(char[][] parentPackageName, char[] packageName) {
StringBuffer fullPackageName = new StringBuffer();
if (parentPackageName != null) {
for (char[] name: parentPackageName) {
if (fullPackageName.length() != 0) {
fullPackageName.append('.');
}
fullPackageName.append(name);
}
}
if (fullPackageName.length() != 0) {
fullPackageName.append('.');
}
fullPackageName.append(packageName);
return isPackage(fullPackageName.toString());
}
public void cleanup() {
}
/**
* Returns the source file for the given class name.
*
* @param className
* @return
*/
private File sourceFile(String className) {
File sourceFile = (File)sourceFiles.get(className);
if (sourceFile != null) {
return sourceFile;
}
String sourceName = className.replace('.', fileSeparator) + ".java";
sourceFile = sourceFileInSourceLocations(sourceName);
sourceFiles.put(className, sourceFile);
return sourceFile;
}
/**
* Returns the source file for the given source path relative to the source locations.
*
* @param className
* @return
*/
private File sourceFileInSourceLocations(String relativePath) {
for (String sourceLocation : sourceLocations) {
File sourceFile = new File(sourceLocation, relativePath);
if (sourceFile.exists()) {
return sourceFile;
}
}
return null;
}
/**
* Returns true if the given name is a package name.
*
* @param name
* @return
*/
private boolean isPackage(String name) {
if (sourceFile(name) != null) {
return false;
}
String resourceName = '/' + name.replace('.', '/') + ".class";
InputStream is = classLoader.getResourceAsStream(resourceName);
if (is == null) {
return true;
} else {
try {
is.close();
} catch (IOException e) {}
return false;
}
}
/**
* Find the NameAnswer for by the given class name.
*
* @param className
* @return
*/
private NameEnvironmentAnswer nameAnswer(String className) {
try {
File sourceFile = sourceFile(className);
if (sourceFile != null) {
ICompilationUnit compilationUnit = new FileCompilationUnit(sourceFile.getAbsolutePath(), className);
return new NameEnvironmentAnswer(compilationUnit, null);
}
String resourceName = className.replace('.', '/') + ".class";
InputStream is = classLoader.getResourceAsStream(resourceName);
if (is == null) {
return null;
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] b = new byte[2048];
for (;;) {
int n = is.read(b);
if (n <= 0) {
break;
}
bos.write(b, 0, n);
}
byte[] classBytes = bos.toByteArray();
ClassFileReader classFileReader = new ClassFileReader(classBytes, className.toCharArray(), true);
return new NameEnvironmentAnswer(classFileReader, null);
} catch (IOException e) {
throw new IllegalArgumentException(e);
} catch (ClassFormatException e) {
throw new IllegalArgumentException(e);
}
}
}
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