| /* |
| * 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(). |
| * @return - |
| * @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 |