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/*
* Copyright 2002,2004 Apache Software Foundation
*
* Licensed 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.tools.ant.util.depend.bcel;
import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.tools.ant.util.depend.AbstractAnalyzer;
/**
* A dependency analyzer which returns superclass and superinterface
* dependencies.
*
* @author Conor MacNeill
*/
public class AncestorAnalyzer extends AbstractAnalyzer {
/**
* Default constructor
*
* Causes the BCEL classes to load to ensure BCEL dependencies can
* be satisfied
*/
public AncestorAnalyzer() {
// force BCEL classes to load now
try {
new ClassParser("force");
} catch (IOException e) {
// ignore
}
}
/**
* Determine the dependencies of the configured root classes.
*
* @param files a vector to be populated with the files which contain
* the dependency classes
* @param classes a vector to be populated with the names of the
* depencency classes.
*/
protected void determineDependencies(Vector files, Vector classes) {
// we get the root classes and build up a set of
// classes upon which they depend
Hashtable dependencies = new Hashtable();
Hashtable containers = new Hashtable();
Hashtable toAnalyze = new Hashtable();
Hashtable nextAnalyze = new Hashtable();
for (Enumeration e = getRootClasses(); e.hasMoreElements();) {
String classname = (String) e.nextElement();
toAnalyze.put(classname, classname);
}
int count = 0;
int maxCount = isClosureRequired() ? MAX_LOOPS : 2;
while (toAnalyze.size() != 0 && count++ < maxCount) {
nextAnalyze.clear();
for (Enumeration e = toAnalyze.keys(); e.hasMoreElements();) {
String classname = (String) e.nextElement();
dependencies.put(classname, classname);
try {
File container = getClassContainer(classname);
if (container == null) {
continue;
}
containers.put(container, container);
ClassParser parser = null;
if (container.getName().endsWith(".class")) {
parser = new ClassParser(container.getPath());
} else {
parser = new ClassParser(container.getPath(),
classname.replace('.', '/') + ".class");
}
JavaClass javaClass = parser.parse();
String[] interfaces = javaClass.getInterfaceNames();
for (int i = 0; i < interfaces.length; ++i) {
String interfaceName = interfaces[i];
if (!dependencies.containsKey(interfaceName)) {
nextAnalyze.put(interfaceName, interfaceName);
}
}
if (javaClass.isClass()) {
String superClass = javaClass.getSuperclassName();
if (!dependencies.containsKey(superClass)) {
nextAnalyze.put(superClass, superClass);
}
}
} catch (IOException ioe) {
// ignore
}
}
Hashtable temp = toAnalyze;
toAnalyze = nextAnalyze;
nextAnalyze = temp;
}
files.removeAllElements();
for (Enumeration e = containers.keys(); e.hasMoreElements();) {
files.addElement((File) e.nextElement());
}
classes.removeAllElements();
for (Enumeration e = dependencies.keys(); e.hasMoreElements();) {
classes.addElement((String) e.nextElement());
}
}
/**
* Indicate if this analyzer can determine dependent files.
*
* @return true if the analyzer provides dependency file information.
*/
protected boolean supportsFileDependencies() {
return true;
}
}
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