001 // Copyright 2004, 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. 014 015 package org.apache.tapestry.html; 016 017 import java.io.IOException; 018 import java.io.LineNumberReader; 019 import java.io.Reader; 020 import java.io.StringReader; 021 022 import org.apache.hivemind.ApplicationRuntimeException; 023 import org.apache.tapestry.AbstractComponent; 024 import org.apache.tapestry.IMarkupWriter; 025 import org.apache.tapestry.IRequestCycle; 026 027 /** 028 * Inserts formatted text (possibly collected using a {@link org.apache.tapestry.form.TextArea} 029 * component. [<a href="../../../../../ComponentReference/InsertText.html">Component Reference</a>] 030 * <p> 031 * To maintain the line breaks provided originally, this component will break the input into 032 * individual lines and insert additional HTML to make each line seperate. 033 * <p> 034 * This can be down more simply, using the <pre> HTML element, but that usually renders the 035 * text in a non-proportional font. 036 * 037 * @author Howard Lewis Ship 038 */ 039 040 public abstract class InsertText extends AbstractComponent 041 { 042 protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) 043 { 044 if (cycle.isRewinding()) 045 return; 046 047 String value = getValue(); 048 049 if (value == null) 050 return; 051 052 StringReader reader = null; 053 LineNumberReader lineReader = null; 054 InsertTextMode mode = getMode(); 055 boolean raw = getRaw(); 056 057 try 058 { 059 reader = new StringReader(value); 060 061 lineReader = new LineNumberReader(reader); 062 063 int lineNumber = 0; 064 065 while (true) 066 { 067 String line = lineReader.readLine(); 068 069 // Exit loop at end of file. 070 071 if (line == null) 072 break; 073 074 mode.writeLine(lineNumber, line, writer, raw); 075 076 lineNumber++; 077 } 078 079 } 080 catch (IOException ex) 081 { 082 throw new ApplicationRuntimeException(HTMLMessages.textConversionError(ex), this, null, 083 ex); 084 } 085 finally 086 { 087 close(lineReader); 088 close(reader); 089 } 090 091 } 092 093 private void close(Reader reader) 094 { 095 if (reader == null) 096 return; 097 098 try 099 { 100 reader.close(); 101 } 102 catch (IOException e) 103 { 104 } 105 } 106 107 /** Parameter */ 108 public abstract InsertTextMode getMode(); 109 110 public abstract void setMode(InsertTextMode mode); 111 112 /** Parameter */ 113 114 public abstract String getValue(); 115 116 /** Parameter */ 117 118 public abstract boolean getRaw(); 119 120 /** 121 * Sets the mode parameter property to its default, {@link InsertTextMode#BREAK}. 122 * 123 * @since 3.0 124 */ 125 protected void finishLoad() 126 { 127 setMode(InsertTextMode.BREAK); 128 } 129 130 }