/*
 * ModeShape (http://www.modeshape.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.infinispan.schematic.document;

import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Set;
import org.infinispan.commons.marshall.SerializeWith;
import org.infinispan.commons.util.Util;
import org.infinispan.schematic.internal.SchematicExternalizer;
import org.infinispan.schematic.internal.marshall.Ids;

@Immutable
@SerializeWith( MinKey.Externalizer.class )
public class MinKey {

    private static final String MIN_KEY_VALUE = "";

    protected static final MinKey INSTANCE = new MinKey();

    public static final MinKey getInstance() {
        return INSTANCE;
    }

    private MinKey() {
        // prevent instantiation
    }

    @Override
    public int hashCode() {
        return MIN_KEY_VALUE.hashCode();
    }

    @Override
    public boolean equals( Object obj ) {
        return obj == this || obj instanceof MinKey;
    }

    @Override
    public String toString() {
        return "MaxKey";
    }

    public static class Externalizer extends SchematicExternalizer<MinKey> {
        private static final long serialVersionUID = 1L;

        @Override
        public void writeObject( ObjectOutput output,
                                 MinKey value ) {
        }

        @Override
        public MinKey readObject( ObjectInput input ) {
            return MinKey.INSTANCE;
        }

        @Override
        public Integer getId() {
            return Ids.SCHEMATIC_VALUE_MINKEY;
        }

        @SuppressWarnings( "unchecked" )
        @Override
        public Set<Class<? extends MinKey>> getTypeClasses() {
            return Util.<Class<? extends MinKey>>asSet(MinKey.class);
        }
    }
}
