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Ant example source code file (ClassCPInfo.java)

This example Ant source code file (ClassCPInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

class, classcpinfo, classcpinfo, constant, constantpoolentry, entry, entry, io, ioexception, pool, string, string, utf8cpinfo, utf8cpinfo

The ClassCPInfo.java source code

/*
 *  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.constantpool;

import java.io.DataInputStream;
import java.io.IOException;

/**
 * The constant pool entry which stores class information.
 *
 */
public class ClassCPInfo extends ConstantPoolEntry {

    /**
     * The class' name. This will be only valid if the entry has been
     * resolved against the constant pool.
     */
    private String className;

    /**
     * The index into the constant pool where this class' name is stored. If
     * the class name is changed, this entry is invalid until this entry is
     * connected to a constant pool.
     */
    private int index;

    /**
     * Constructor. Sets the tag value for this entry to type Class
     */
    public ClassCPInfo() {
        super(CONSTANT_CLASS, 1);
    }

    /**
     * Read the entry from a stream.
     *
     * @param cpStream the stream containing the constant pool entry to be
     *      read.
     * @exception IOException thrown if there is a problem reading the entry
     *      from the stream.
     */
    public void read(DataInputStream cpStream) throws IOException {
        index = cpStream.readUnsignedShort();
        className = "unresolved";
    }

    /**
     * Generate a string readable version of this entry
     *
     * @return string representation of this constant pool entry
     */
    public String toString() {
        return "Class Constant Pool Entry for " + className + "[" + index + "]";
    }

    /**
     * Resolve this class info against the given constant pool.
     *
     * @param constantPool the constant pool with which to resolve the
     *      class.
     */
    public void resolve(ConstantPool constantPool) {
        className = ((Utf8CPInfo) constantPool.getEntry(index)).getValue();

        super.resolve(constantPool);
    }

    /**
     * Get the class name of this entry.
     *
     * @return the class' name.
     */
    public String getClassName() {
        return className;
    }

}

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