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* The Apache Software License, Version 1.1
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* Copyright (c) 2000 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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* 4. The names "The Jakarta Project", "Ant", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.tools.ant.taskdefs.optional.depend;
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import java.lang.reflect.Modifier;
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import org.apache.tools.ant.taskdefs.optional.depend.constantpool.*;
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* A ClassFile object stores information about a Java class.
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* The class may be read from a DataInputStream.and written
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* to a DataOutputStream. These are usually streams from a Java
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* class file or a class file component of a Jar file.
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* @author Conor MacNeill
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public class ClassFile {
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* The Magic Value that marks the start of a Java class file
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static private final int CLASS_MAGIC = 0xCAFEBABE;
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* This class' constant pool.
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private ConstantPool constantPool;
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* The class name for this class.
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private String className;
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* Read the class from a data stream.
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* This method takes an InputStream as input and
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* parses the class from the stream.
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* @param stream an InputStream from which the class will be read
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* @throws IOException if there is a problem reading from the given stream.
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* @throws ClassFormatError if the class cannot be parsed correctly
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public void read(InputStream stream) throws IOException, ClassFormatError {
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DataInputStream classStream = new DataInputStream(stream);
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if (classStream.readInt() != CLASS_MAGIC) {
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throw new ClassFormatError("No Magic Code Found - probably not a Java class file.");
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// right we have a good looking class file.
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int minorVersion = classStream.readUnsignedShort();
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int majorVersion = classStream.readUnsignedShort();
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// read the constant pool in and resolve it
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constantPool = new ConstantPool();
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constantPool.read(classStream);
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constantPool.resolve();
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int accessFlags = classStream.readUnsignedShort();
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int thisClassIndex = classStream.readUnsignedShort();
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int superClassIndex = classStream.readUnsignedShort();
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className = ((ClassCPInfo) constantPool.getEntry(thisClassIndex)).getClassName();
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* Get the classes which this class references.
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public Vector getClassRefs() {
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Vector classRefs = new Vector();
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for (int i = 0; i < constantPool.size(); ++i) {
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ConstantPoolEntry entry = constantPool.getEntry(i);
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if (entry != null && entry.getTag() == ConstantPoolEntry.CONSTANT_Class) {
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ClassCPInfo classEntry = (ClassCPInfo) entry;
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if (!classEntry.getClassName().equals(className)) {
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classRefs.addElement(ClassFileUtils.convertSlashName(classEntry.getClassName()));
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* Get the class' fully qualified name in dot format.
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* @return the class name in dot format (eg. java.lang.Object)
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public String getFullClassName() {
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return ClassFileUtils.convertSlashName(className);