    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 */
    017package org.apache.bcel.classfile;
    018
    019import java.io.DataInput;
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022
    023import org.apache.bcel.Const;
    024
    025/**
    026 * This class is derived from the abstract {@link Constant} and represents a reference to a method type.
    027 *
    028 * @see Constant
    029 * @since 6.0
    030 */
    031public final class ConstantMethodType extends Constant {
    032
    033    private int descriptorIndex;
    034
    035    /**
    036     * Initialize from another object.
    037     *
    038     * @param c Source to copy.
    039     */
    040    public ConstantMethodType(final ConstantMethodType c) {
    041        this(c.getDescriptorIndex());
    042    }
    043
    044    /**
    045     * Initialize instance from file data.
    046     *
    047     * @param file Input stream
    048     * @throws IOException if an I/O error occurs.
    049     */
    050    ConstantMethodType(final DataInput file) throws IOException {
    051        this(file.readUnsignedShort());
    052    }
    053
    054    public ConstantMethodType(final int descriptorIndex) {
    055        super(Const.CONSTANT_MethodType);
    056        this.descriptorIndex = descriptorIndex;
    057    }
    058
    059    /**
    060     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e.,
    061     * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    062     *
    063     * @param v Visitor object
    064     */
    065    @Override
    066    public void accept(final Visitor v) {
    067        v.visitConstantMethodType(this);
    068    }
    069
    070    /**
    071     * Dump name and signature index to file stream in binary format.
    072     *
    073     * @param file Output file stream
    074     * @throws IOException if an I/O error occurs.
    075     */
    076    @Override
    077    public void dump(final DataOutputStream file) throws IOException {
    078        file.writeByte(super.getTag());
    079        file.writeShort(descriptorIndex);
    080    }
    081
    082    public int getDescriptorIndex() {
    083        return descriptorIndex;
    084    }
    085
    086    public void setDescriptorIndex(final int descriptorIndex) {
    087        this.descriptorIndex = descriptorIndex;
    088    }
    089
    090    /**
    091     * @return String representation
    092     */
    093    @Override
    094    public String toString() {
    095        return super.toString() + "(descriptorIndex = " + descriptorIndex + ")";
    096    }
    097}