/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.vinci.transport.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.vinci.debug.FatalException;
import org.apache.vinci.transport.Transportable;
import org.apache.vinci.transport.TransportableFactory;
/**
* Provides utility method for converting between differing transportable types.
*/
public class TransportableConverter {
/**
* Utility class -- not meant to be instantiated.
*/
private TransportableConverter() {
}
/**
* Convert a transportable to the type of transportable returned by a factory.
*
* @param convert_me
* The transportable to get converted. Must implement toStream().
* @param factory
* The factory used to create the return Transportable, which must implement
* fromStream().
*
* @pre convert_me != null
* @pre factory != null
*/
static public Transportable convert(Transportable convert_me, TransportableFactory factory) {
Transportable return_me = factory.makeTransportable();
convert(convert_me, return_me);
return return_me;
}
/**
* Copy the contents of one transportable into the other transportable.
*
* @param convert_me
* The transportable to get converted. Must implement toStream().
* @param into_me
* The transportable to get populated. Must implement fromStream().
*
* @pre convert_me != null
* @pre into_me != null
*/
static public void convert(Transportable convert_me, Transportable into_me) {
try {
ByteArrayOutputStream byte_out = new ByteArrayOutputStream();
try {
convert_me.toStream(byte_out);
} finally {
byte_out.close();
}
ByteArrayInputStream byte_in = new ByteArrayInputStream(byte_out.toByteArray());
try {
byte_out = null; // allow GC
into_me.fromStream(byte_in);
} finally {
byte_in.close();
}
} catch (IOException e) {
throw new FatalException(e); // this should not arise.
}
}
} // class