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protobuf serialization for pre-existing objects
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//========================================================================
//Copyright 2007-2011 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.runtime;

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

import com.dyuproject.protostuff.Input;
import com.dyuproject.protostuff.MapSchema;
import com.dyuproject.protostuff.Output;
import com.dyuproject.protostuff.Pipe;
import com.dyuproject.protostuff.MapSchema.MapWrapper;
import com.dyuproject.protostuff.MapSchema.MessageFactory;
import com.dyuproject.protostuff.Tag;
import com.dyuproject.protostuff.WireFormat.FieldType;
import com.dyuproject.protostuff.runtime.MappedSchema.Field;

/**
 * A runtime field for a {@link Map}.
 * Allows null keys and values. 
 *
 * @author David Yu
 * @created Jan 21, 2011
 */
abstract class RuntimeMapField extends Field
{
    
    /**
     * Since we cannot inherit multiple classes, we create this Map schema simply 
     * to delegate to the wrapping class' abstract methods.
     */
    protected final MapSchema schema;
    
    public RuntimeMapField(FieldType type, int number, String name, Tag tag, 
            MessageFactory messageFactory)
    {
        super(type, number, name, false, tag);
        schema = new MapSchema(messageFactory)
        {
            protected K readKeyFrom(Input input, MapWrapper wrapper) 
            throws IOException
            {
                return kFrom(input, wrapper);
            }
            protected void putValueFrom(Input input, MapWrapper wrapper, K key) 
            throws IOException
            {
                vPutFrom(input, wrapper, key);
            }
            protected void writeKeyTo(Output output, int fieldNumber, K key, 
                    boolean repeated) throws IOException
            {
                kTo(output, fieldNumber, key, repeated);
            }
            protected void writeValueTo(Output output, int fieldNumber, V val, 
                    boolean repeated) throws IOException
            {
                vTo(output, fieldNumber, val, repeated);
            }
            protected void transferKey(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException
            {
                kTransfer(pipe, input, output, number, repeated);
            }
            protected void transferValue(Pipe pipe, Input input, Output output, int number, boolean repeated) throws IOException
            {
                vTransfer(pipe, input, output, number, repeated);
            }
        };
    }
    
    protected abstract K kFrom(Input input, MapWrapper wrapper) throws IOException;
    
    protected abstract void vPutFrom(Input input, MapWrapper wrapper, K key) 
    throws IOException;
    
    protected abstract void kTo(Output output, int fieldNumber, K key, boolean repeated) 
    throws IOException;

    protected abstract void vTo(Output output, int fieldNumber, V value, boolean repeated) 
    throws IOException;
    
    protected abstract void kTransfer(Pipe pipe, Input input, Output output, int number, 
            boolean repeated) throws IOException;
    
    protected abstract void vTransfer(Pipe pipe, Input input, Output output, int number, 
            boolean repeated) throws IOException;

}