    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.classfile;
    019
    020import java.io.DataInput;
    021import java.io.DataOutputStream;
    022import java.io.IOException;
    023
    024import org.apache.bcel.Const;
    025
    026/**
    027 * This class is derived from the abstract {@link Constant}
    028 * and represents a reference to a method type.
    029 *
    030 * @see     Constant
    031 * @since 6.0
    032 */
    033public final class ConstantMethodType extends Constant {
    034
    035    private int descriptor_index;
    036
    037
    038    /**
    039     * Initialize from another object.
    040     */
    041    public ConstantMethodType(final ConstantMethodType c) {
    042        this(c.getDescriptorIndex());
    043    }
    044
    045
    046    /**
    047     * Initialize instance from file data.
    048     *
    049     * @param file Input stream
    050     * @throws IOException
    051     */
    052    ConstantMethodType(final DataInput file) throws IOException {
    053        this(file.readUnsignedShort());
    054    }
    055
    056
    057    public ConstantMethodType(final int descriptor_index) {
    058        super(Const.CONSTANT_MethodType);
    059        this.descriptor_index = descriptor_index;
    060    }
    061
    062
    063    /**
    064     * Called by objects that are traversing the nodes of the tree implicitly
    065     * defined by the contents of a Java class. I.e., the hierarchy of methods,
    066     * fields, attributes, etc. spawns a tree of objects.
    067     *
    068     * @param v Visitor object
    069     */
    070    @Override
    071    public void accept( final Visitor v ) {
    072        v.visitConstantMethodType(this);
    073    }
    074
    075
    076    /**
    077     * Dump name and signature index to file stream in binary format.
    078     *
    079     * @param file Output file stream
    080     * @throws IOException
    081     */
    082    @Override
    083    public void dump( final DataOutputStream file ) throws IOException {
    084        file.writeByte(super.getTag());
    085        file.writeShort(descriptor_index);
    086    }
    087
    088
    089    public int getDescriptorIndex() {
    090        return descriptor_index;
    091    }
    092
    093
    094    public void setDescriptorIndex(final int descriptor_index) {
    095        this.descriptor_index = descriptor_index;
    096    }
    097
    098
    099    /**
    100     * @return String representation
    101     */
    102    @Override
    103    public String toString() {
    104        return super.toString() + "(descriptor_index = " + descriptor_index + ")";
    105    }
    106}