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.verifier.structurals;
018
019import org.apache.bcel.Const;
020import org.apache.bcel.Constants;
021import org.apache.bcel.generic.ObjectType;
022import org.apache.bcel.generic.ReferenceType;
023
024/**
025 * This class represents an uninitialized object type; see The Java Virtual Machine Specification, Second Edition, page
026 * 147: 4.9.4 for more details.
027 */
028public class UninitializedObjectType extends ReferenceType implements Constants {
029
030    /** The "initialized" version. */
031    private final ObjectType initialized;
032
033    /**
034     * Creates a new instance.
035     *
036     * @param objectType uninitialized object type.
037     */
038    public UninitializedObjectType(final ObjectType objectType) {
039        super(Const.T_UNKNOWN, "<UNINITIALIZED OBJECT OF TYPE '" + objectType.getClassName() + "'>");
040        initialized = objectType;
041    }
042
043    /**
044     * Returns true on equality of this and o. Equality means the ObjectType instances of "initialized" equal one another in
045     * this and the o instance.
046     */
047    @Override
048    public boolean equals(final Object o) {
049        if (!(o instanceof UninitializedObjectType)) {
050            return false;
051        }
052        return initialized.equals(((UninitializedObjectType) o).initialized);
053    }
054
055    /**
056     * Returns the ObjectType of the same class as the one of the uninitialized object represented by this
057     * UninitializedObjectType instance.
058     *
059     * @return the ObjectType.
060     */
061    public ObjectType getInitialized() {
062        return initialized;
063    }
064
065    /**
066     * @return a hash code value for the object.
067     */
068    @Override
069    public int hashCode() {
070        return initialized.hashCode();
071    }
072}