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predefined schemas for jdk collections and maps
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//========================================================================
//Copyright 2007-2010 David Yu [email protected]
//------------------------------------------------------------------------
//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 com.dyuproject.protostuff;

import java.io.IOException;
import java.util.Map;

/**
 * A schema for a {@link Map} with {@link Message} or pojo keys.
 * The key and value can be null (depending on the particular map impl).
 *
 * @author David Yu
 * @created Jun 26, 2010
 */
public final class MessageMapSchema extends MapSchema
{
    
    /**
     * The schema of the message key.
     */
    public final Schema kSchema;
    /**
     * The schema of the message value.
     */
    public final Schema vSchema;
    /**
     * The pipe schema of the message key.
     */
    public final Pipe.Schema kPipeSchema;
    /**
     * The pipe schema of the message value.
     */
    public final Pipe.Schema vPipeSchema;
    
    public MessageMapSchema(Schema kSchema, Schema vSchema)
    {
        this(kSchema, vSchema, null, null);
    }
    
    public MessageMapSchema(Schema kSchema, Schema vSchema, 
            Pipe.Schema kPipeSchema, Pipe.Schema vPipeSchema)
    {
        this.kSchema = kSchema;
        this.vSchema = vSchema;
        this.kPipeSchema = kPipeSchema;
        this.vPipeSchema = vPipeSchema;
    }

    protected K readKeyFrom(Input input, MapWrapper wrapper) throws IOException
    {
        return input.mergeObject(null, kSchema);
    }

    protected void putValueFrom(Input input, MapWrapper wrapper, K key) 
    throws IOException
    {
        wrapper.put(key, input.mergeObject(null, vSchema));
    }

    protected void writeKeyTo(Output output, int fieldNumber, K value, boolean repeated) 
    throws IOException
    {
        output.writeObject(fieldNumber, value, kSchema, repeated);
    }

    protected void writeValueTo(Output output, int fieldNumber, V value, boolean repeated) 
    throws IOException
    {
        output.writeObject(fieldNumber, value, vSchema, repeated);
    }

    protected void transferKey(Pipe pipe, Input input, Output output, int number, 
            boolean repeated) throws IOException
    {
        if(kPipeSchema == null)
        {
            throw new RuntimeException("No pipe schema for key: " + 
                    kSchema.typeClass().getName());
        }
        
        output.writeObject(number, pipe, kPipeSchema, repeated);
    }

    protected void transferValue(Pipe pipe, Input input, Output output, int number, 
            boolean repeated) throws IOException
    {
        if(vPipeSchema == null)
        {
            throw new RuntimeException("No pipe schema for value: " + 
                    vSchema.typeClass().getName());
        }
        
        output.writeObject(number, pipe, vPipeSchema, repeated);
    }

}