001// Copyright 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.tapestry.contrib.components; 016 017import java.io.BufferedOutputStream; 018import java.io.CharArrayWriter; 019import java.io.ObjectOutputStream; 020 021import org.apache.tapestry.AbstractComponent; 022import org.apache.tapestry.IMarkupWriter; 023import org.apache.tapestry.IRequestCycle; 024import org.apache.tapestry.util.io.BinaryDumpOutputStream; 025 026/** 027 * Used to dump out an object's serialized representation in a mix of hex and ascii. The output is 028 * formatted for a fixed width font, typically should be enclosed in <pre> tags. 029 * 030 * @see org.apache.tapestry.util.io.BinaryDumpOutputStream 031 * @author Howard M. Lewis Ship 032 * @since 4.0 033 */ 034 035public abstract class DumpObject extends AbstractComponent 036{ 037 // Parameters: 038 039 public abstract Object getObject(); 040 041 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 042 { 043 if (cycle.isRewinding()) 044 return; 045 046 String asText = convert(getObject()); 047 048 writer.print(asText); 049 } 050 051 String convert(Object object) 052 { 053 try 054 { 055 CharArrayWriter writer = new CharArrayWriter(); 056 BinaryDumpOutputStream bdos = new BinaryDumpOutputStream(writer); 057 ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bdos)); 058 059 oos.writeObject(object); 060 061 oos.close(); 062 063 return writer.toString(); 064 } 065 catch (Exception ex) 066 { 067 return ex.toString(); 068 } 069 } 070}