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/*
 * jabsorb - a Java to JavaScript Advanced Object Request Broker
 * http://www.jabsorb.org
 *
 * Copyright 2007-2009 The jabsorb team
 *
 * based on original code from
 * JSON-RPC-Java - a JSON-RPC to Java Bridge with dynamic invocation
 *
 * Copyright Metaparadigm Pte. Ltd. 2004.
 * Michael Clark 
 *
 * 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 org.jabsorb.serializer.impl;

import java.math.BigDecimal;

import org.jabsorb.serializer.AbstractSerializer;
import org.jabsorb.serializer.MarshallException;
import org.jabsorb.serializer.ObjectMatch;
import org.jabsorb.serializer.SerializerState;
import org.jabsorb.serializer.UnmarshallException;

/**
 * Serialises numeric values
 */
public class NumberSerializer extends AbstractSerializer
{
  /**
   * Unique serialisation id.
   */
  private final static long serialVersionUID = 2;

  /**
   * Classes that this can serialise.
   */
  private static Class[] _serializableClasses = new Class[] { Integer.class,
      Byte.class, Short.class, Long.class, Float.class, Double.class,
      BigDecimal.class };

  /**
   * Classes that this can serialise to.
   */
  private static Class[] _JSONClasses = new Class[] { Integer.class,
      Byte.class, Short.class, Long.class, Float.class, Double.class,
      BigDecimal.class, String.class };

  public Class[] getSerializableClasses()
  {
    return _serializableClasses;
  }

  public Class[] getJSONClasses()
  {
    return _JSONClasses;
  }

  /**
   * Converts a javascript object to a Java number
   * 
   * @param clazz The class of the Java object that it should be converted to
   * @param jso The javascript object
   * @return A Java primitive type in its java.lang wrapper.
   * @throws NumberFormatException If clazz is numeric and jso does not parse
   *           into a number.
   */
  public Object toNumber(Class clazz, Object jso) throws NumberFormatException
  {
    // TODO: isn't this largely a dupe of PrimitiveSerialiser.toPrimitive()?
    // We should probably have just one method that does this, or have one use
    // the other
    if (clazz == Integer.class)
    {
      if (jso instanceof String)
      {
        return new Integer((String) jso);
      }
      return new Integer(((Number) jso).intValue());
    }
    else if (clazz == Long.class)
    {
      if (jso instanceof String)
      {
        return new Long((String) jso);
      }
      return new Long(((Number) jso).longValue());
    }
    else if (clazz == Short.class)
    {
      if (jso instanceof String)
      {
        return new Short((String) jso);
      }
      return new Short(((Number) jso).shortValue());
    }
    else if (clazz == Byte.class)
    {
      if (jso instanceof String)
      {
        return new Byte((String) jso);
      }
      return new Byte(((Number) jso).byteValue());
    }
    else if (clazz == Float.class)
    {
      if (jso instanceof String)
      {
        return new Float((String) jso);
      }
      return new Float(((Number) jso).floatValue());
    }
    else if (clazz == Double.class)
    {
      if (jso instanceof String)
      {
        return new Double((String) jso);
      }
      return new Double(((Number) jso).doubleValue());
    }
    else if (clazz == BigDecimal.class)
    {
      if (jso instanceof String)
      {
        return new BigDecimal((String) jso);
      }
      return new BigDecimal(((Number) jso).doubleValue()); // hmmm?
    }
    return null;
  }

  public ObjectMatch tryUnmarshall(SerializerState state, Class clazz,
      Object jso) throws UnmarshallException
  {
    try
    {
      toNumber(clazz, jso);
    }
    catch (NumberFormatException e)
    {
      throw new UnmarshallException("not a number", e);
    }
    state.setSerialized(jso, ObjectMatch.OKAY);
    return ObjectMatch.OKAY;
  }

  public Object unmarshall(SerializerState state, Class clazz, Object jso)
      throws UnmarshallException
  {
    try
    {
      if (jso == null || "".equals(jso))
      {
        return null;
      }
      Object num = toNumber(clazz, jso);
      state.setSerialized(jso, num);
      return num;
    }
    catch (NumberFormatException e)
    {
      throw new UnmarshallException("cannot convert object " + jso
          + " to type " + clazz.getName(), e);
    }
  }

  public Object marshall(SerializerState state, Object p, Object o)
      throws MarshallException
  {
    return o;
  }

}