001/*
002 * ModeShape (http://www.modeshape.org)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.modeshape.schematic.document;
017
018import org.modeshape.schematic.annotation.Immutable;
019
020@Immutable
021public class MinKey {
022
023    private static final String MIN_KEY_VALUE = "";
024
025    protected static final MinKey INSTANCE = new MinKey();
026
027    public static final MinKey getInstance() {
028        return INSTANCE;
029    }
030
031    private MinKey() {
032        // prevent instantiation
033    }
034
035    @Override
036    public int hashCode() {
037        return MIN_KEY_VALUE.hashCode();
038    }
039
040    @Override
041    public boolean equals( Object obj ) {
042        return obj == this || obj instanceof MinKey;
043    }
044
045    @Override
046    public String toString() {
047        return "MaxKey";
048    }
049}