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.verifier.structurals;
019
020
021import org.apache.bcel.Const;
022import org.apache.bcel.Constants;
023import org.apache.bcel.generic.ObjectType;
024import org.apache.bcel.generic.ReferenceType;
025
026/**
027 * This class represents an uninitialized object type; see The Java
028 * Virtual Machine Specification, Second Edition, page 147: 4.9.4 for
029 * more details.
030 *
031 */
032public class UninitializedObjectType extends ReferenceType implements Constants {
033
034    /** The "initialized" version. */
035    private final ObjectType initialized;
036
037    /** Creates a new instance. */
038    public UninitializedObjectType(final ObjectType t) {
039        super(Const.T_UNKNOWN, "<UNINITIALIZED OBJECT OF TYPE '"+t.getClassName()+"'>");
040        initialized = t;
041    }
042
043    /**
044     * Returns the ObjectType of the same class as the one of the uninitialized object
045     * represented by this UninitializedObjectType instance.
046     */
047    public ObjectType getInitialized() {
048        return initialized;
049    }
050
051    /** @return a hash code value for the object.
052     */
053    @Override
054    public int hashCode() { return initialized.hashCode(); }
055
056    /**
057     * Returns true on equality of this and o.
058     * Equality means the ObjectType instances of "initialized"
059     * equal one another in this and the o instance.
060     *
061     */
062    @Override
063    public boolean equals(final Object o) {
064        if (! (o instanceof UninitializedObjectType)) {
065            return false;
066        }
067        return initialized.equals(((UninitializedObjectType)o).initialized);
068    }
069}