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