| /* |
| * 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.tools.ant.taskdefs.optional.depend; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Vector; |
| import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ClassCPInfo; |
| import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ConstantPool; |
| import org.apache.tools.ant.taskdefs.optional.depend.constantpool.ConstantPoolEntry; |
| |
| /** |
| * A ClassFile object stores information about a Java class. The class may |
| * be read from a DataInputStream.and written to a DataOutputStream. These |
| * are usually streams from a Java class file or a class file component of a |
| * Jar file. |
| * |
| */ |
| public class ClassFile { |
| |
| /** The Magic Value that marks the start of a Java class file */ |
| private static final int CLASS_MAGIC = 0xCAFEBABE; |
| |
| /** This class' constant pool. */ |
| private ConstantPool constantPool; |
| |
| /** The class name for this class. */ |
| private String className; |
| |
| /** |
| * Read the class from a data stream. This method takes an InputStream |
| * as input and parses the class from the stream. <p> |
| * |
| * |
| * |
| * @param stream an InputStream from which the class will be read |
| * @exception IOException if there is a problem reading from the given |
| * stream. |
| * @exception ClassFormatError if the class cannot be parsed correctly |
| */ |
| public void read(InputStream stream) throws IOException, ClassFormatError { |
| DataInputStream classStream = new DataInputStream(stream); |
| |
| if (classStream.readInt() != CLASS_MAGIC) { |
| throw new ClassFormatError("No Magic Code Found " |
| + "- probably not a Java class file."); |
| } |
| |
| // right we have a good looking class file. |
| /* int minorVersion = */ classStream.readUnsignedShort(); |
| /* int majorVersion = */ classStream.readUnsignedShort(); |
| |
| // read the constant pool in and resolve it |
| constantPool = new ConstantPool(); |
| |
| constantPool.read(classStream); |
| constantPool.resolve(); |
| |
| /* int accessFlags = */ classStream.readUnsignedShort(); |
| int thisClassIndex = classStream.readUnsignedShort(); |
| /* int superClassIndex = */ classStream.readUnsignedShort(); |
| ClassCPInfo classInfo |
| = (ClassCPInfo) constantPool.getEntry(thisClassIndex); |
| className = classInfo.getClassName(); |
| } |
| |
| |
| /** |
| * Get the classes which this class references. |
| * |
| * @return a vector of class names which this class references |
| */ |
| public Vector getClassRefs() { |
| |
| Vector classRefs = new Vector(); |
| |
| for (int i = 0; i < constantPool.size(); ++i) { |
| ConstantPoolEntry entry = constantPool.getEntry(i); |
| |
| if (entry != null |
| && entry.getTag() == ConstantPoolEntry.CONSTANT_CLASS) { |
| ClassCPInfo classEntry = (ClassCPInfo) entry; |
| |
| if (!classEntry.getClassName().equals(className)) { |
| classRefs.addElement( |
| ClassFileUtils.convertSlashName(classEntry.getClassName())); |
| } |
| } |
| } |
| |
| return classRefs; |
| } |
| |
| /** |
| * Get the class' fully qualified name in dot format. |
| * |
| * @return the class name in dot format (eg. java.lang.Object) |
| */ |
| public String getFullClassName() { |
| return ClassFileUtils.convertSlashName(className); |
| } |
| } |
| |