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