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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 io.protostuff.runtime;

import java.io.IOException;
import java.util.Collection;

import io.protostuff.CollectionSchema;
import io.protostuff.CollectionSchema.MessageFactory;
import io.protostuff.Input;
import io.protostuff.Output;
import io.protostuff.Pipe;
import io.protostuff.Tag;
import io.protostuff.WireFormat.FieldType;

/**
 * A runtime field for a {@link Collection}. Null values are not written.
 * 
 * @author David Yu
 * @created Jan 26, 2011
 */
abstract class RuntimeCollectionField extends Field
{

    /**
     * Since we cannot inherit multiple classes, we create this Collection schema simply to delegate to the wrapping
     * class' abstract methods.
     */
    protected final CollectionSchema schema;

    public RuntimeCollectionField(FieldType type, int number, String name,
            Tag tag, MessageFactory messageFactory)
    {
        super(type, number, name, false, tag);
        schema = new CollectionSchema(messageFactory)
        {
            @Override
            protected void addValueFrom(Input input, Collection collection)
                    throws IOException
            {
                RuntimeCollectionField.this.addValueFrom(input, collection);
            }

            @Override
            protected void writeValueTo(Output output, int fieldNumber,
                    V value, boolean repeated) throws IOException
            {
                RuntimeCollectionField.this.writeValueTo(output, fieldNumber,
                        value, repeated);
            }

            @Override
            protected void transferValue(Pipe pipe, Input input, Output output,
                    int number, boolean repeated) throws IOException
            {
                RuntimeCollectionField.this.transferValue(pipe, input, output,
                        number, repeated);
            }
        };
    }

    protected abstract void addValueFrom(Input input, Collection collection)
            throws IOException;

    protected abstract void writeValueTo(Output output, int fieldNumber,
            V value, boolean repeated) throws IOException;

    protected abstract void transferValue(Pipe pipe, Input input,
            Output output, int number, boolean repeated) throws IOException;

}