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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 com.dyuproject.protostuff.Input;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.Tag;
import com.dyuproject.protostuff.WireFormat.FieldType;
import com.dyuproject.protostuff.runtime.MappedSchema.Field;


/**
 * A runtime field w/c represents an abstract class, interface or a base type with 
 * many possible subclasses.
 * 
 * The type metadata is written for the deserializer to know the actual/exact schema to 
 * use upon deserialization.
 * 
 * Limitations:
 * The number of fields are limited to 126 (127 is the usual limit anyway).
 * The order of the fields being written must be preserved.
 * It will not work if the message serialized is coming from the browser 
 * since the fields will most likey be out-of-order 
 * (unless you have control of the json serialization).
 *
 * @author David Yu
 * @created Jan 16, 2011
 */
abstract class RuntimeDerivativeField extends Field
{

    /**
     * The schema of the polymorphic pojo.
     */
    public final DerivativeSchema schema;
    
    /**
     * The class of the message field.
     */
    public final Class