# MapType.java

    /*
     * Copyright (c) 2009, Rickard Öberg. All Rights Reserved.
     *
     * 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.qi4j.api.type;

    import java.lang.reflect.Type;
    import java.util.Map;
    import org.qi4j.api.util.Classes;

    /**
     * Map ValueType.
     * <p>This handles instances of Map.</p>
     */
    public final class MapType
        extends ValueType
    {

        private ValueType keyType;
        private ValueType valueType;
        private final Serialization.Variant variant;

        public static boolean isMap( Type type )
        {
            Class<?> cl = Classes.RAW_CLASS.map( type );
            return Map.class.isAssignableFrom( cl );
        }

        public static MapType of( Class<?> keyType, Class<?> valueType )
        {
            return new MapType( Map.class, ValueType.of( keyType ), ValueType.of( valueType ) );
        }

        public static MapType of( Class<?> keyType, Class<?> valueType, Serialization.Variant variant )
        {
            return new MapType( Map.class, ValueType.of( keyType ), ValueType.of( valueType ), variant );
        }

        public MapType( Class<?> type, ValueType keyType, ValueType valueType )
        {
            this( type, keyType, valueType, Serialization.Variant.entry );
        }

        public MapType( Class<?> type, ValueType keyType, ValueType valueType, Serialization.Variant variant )
        {
            super( type );
            this.keyType = keyType;
            this.valueType = valueType;
            this.variant = variant;
            if( !isMap( type ) )
            {
                throw new IllegalArgumentException( type + " is not a Map." );
            }
        }

        public ValueType keyType()
        {
            return keyType;
        }

        public ValueType valueType()
        {
            return valueType;
        }

        public Serialization.Variant variant()
        {
            return variant;
        }

        @Override
        public String toString()
        {
            return super.toString() + "<" + keyType + "," + valueType + ">";
        }
    }