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 * @version $Id: UninitializedObjectType.java 1749600 2016-06-21 20:43:38Z ggregory $
032 */
033public class UninitializedObjectType extends ReferenceType implements Constants {
034
035    /** The "initialized" version. */
036    private final ObjectType initialized;
037
038    /** Creates a new instance. */
039    public UninitializedObjectType(final ObjectType t) {
040        super(Const.T_UNKNOWN, "<UNINITIALIZED OBJECT OF TYPE '"+t.getClassName()+"'>");
041        initialized = t;
042    }
043
044    /**
045     * Returns the ObjectType of the same class as the one of the uninitialized object
046     * represented by this UninitializedObjectType instance.
047     */
048    public ObjectType getInitialized() {
049        return initialized;
050    }
051
052    /** @return a hash code value for the object.
053     */
054    @Override
055    public int hashCode() { return initialized.hashCode(); }
056
057    /**
058     * Returns true on equality of this and o.
059     * Equality means the ObjectType instances of "initialized"
060     * equal one another in this and the o instance.
061     *
062     */
063    @Override
064    public boolean equals(final Object o) {
065        if (! (o instanceof UninitializedObjectType)) {
066            return false;
067        }
068        return initialized.equals(((UninitializedObjectType)o).initialized);
069    }
070}