    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    public ConstantMethodType(final ConstantMethodType c) {
    039        this(c.getDescriptorIndex());
    040    }
    041
    042    /**
    043     * Initialize instance from file data.
    044     *
    045     * @param file Input stream
    046     * @throws IOException if an I/O error occurs.
    047     */
    048    ConstantMethodType(final DataInput file) throws IOException {
    049        this(file.readUnsignedShort());
    050    }
    051
    052    public ConstantMethodType(final int descriptorIndex) {
    053        super(Const.CONSTANT_MethodType);
    054        this.descriptorIndex = descriptorIndex;
    055    }
    056
    057    /**
    058     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class. I.e.,
    059     * the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    060     *
    061     * @param v Visitor object
    062     */
    063    @Override
    064    public void accept(final Visitor v) {
    065        v.visitConstantMethodType(this);
    066    }
    067
    068    /**
    069     * Dump name and signature index to file stream in binary format.
    070     *
    071     * @param file Output file stream
    072     * @throws IOException if an I/O error occurs.
    073     */
    074    @Override
    075    public void dump(final DataOutputStream file) throws IOException {
    076        file.writeByte(super.getTag());
    077        file.writeShort(descriptorIndex);
    078    }
    079
    080    public int getDescriptorIndex() {
    081        return descriptorIndex;
    082    }
    083
    084    public void setDescriptorIndex(final int descriptorIndex) {
    085        this.descriptorIndex = descriptorIndex;
    086    }
    087
    088    /**
    089     * @return String representation
    090     */
    091    @Override
    092    public String toString() {
    093        return super.toString() + "(descriptorIndex = " + descriptorIndex + ")";
    094    }
    095}