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protobuf serialization for pre-existing objects

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//========================================================================
//Copyright 2012 David Yu
//------------------------------------------------------------------------
//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 com.dyuproject.protostuff.Input;
import com.dyuproject.protostuff.Output;
import com.dyuproject.protostuff.Pipe;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.MappedSchema.Field;

/**
 * Runtime pipe schema.
 * 
 * @author David Yu
 * @created Nov 9, 2012
 */
public final class RuntimePipeSchema extends Pipe.Schema
{
    
    final Field[] fieldsByNumber;
    
    public RuntimePipeSchema(Schema schema, Field[] fieldsByNumber)
    {
        super(schema);
        
        this.fieldsByNumber = fieldsByNumber;
    }

    protected void transfer(Pipe pipe, Input input, Output output) throws IOException
    {
        for(int number = input.readFieldNumber(wrappedSchema); number != 0; 
                number = input.readFieldNumber(wrappedSchema))
        {
            final Field field = number < fieldsByNumber.length ? 
                    fieldsByNumber[number] : null;
            
            if(field == null)
                input.handleUnknownField(number, wrappedSchema);
            else
                field.transfer(pipe, input, output, field.repeated);
        }
    }
}