src/web/org/codehaus/groovy/grails/web/pages/GSPWriter.java

   1 /*
   2  * Copyright 2004-2005 the original author or authors.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.codehaus.groovy.grails.web.pages;
  17
  18 import java.io.PrintWriter;
  19 import java.io.Writer;
  20
  21 /**
  22  * A PrintWriter used in the generation of GSP pages that allows printing to the target output stream and
  23  * maintains a record of the current line number during usage.
  24  *
  25  * @author Graeme Rocher
  26  * @since 13-Jan-2006
  27  */
  28 public class GSPWriter extends PrintWriter {
  29     private int lineNumber = 1;
  30     private int[] lineNumbers = new int[1000];
  31     //private static final Pattern LINE_BREAK = Pattern.compile("\\r\\n|\\n|\\r");
  32     private Parse parse;
  33
  34     public GSPWriter(Writer out, Parse parse) {
  35         super(out);
  36         this.parse = parse;
  37     }
  38
  39     public void write(char buf[], int off, int len) {
  40         super.write(buf, off, len);
  41     }
  42
  43     public void printlnToResponse(String s) {
  44         if(s == null) s = "''";
  45         super.print("out.print(");
  46         super.print(s);
  47         super.print(")");
  48         println();
  49     }
  50
  51     public void printlnToBuffer(String s, int index) {
  52         if(s == null) s = "''";
  53         super.print("buf"+index+" << ");
  54         super.print(s);
  55         println();
  56     }
  57
  58     public void println() {
  59         if(lineNumber >= lineNumbers.length) {
  60             lineNumbers = (int[])resizeArray(lineNumbers, lineNumbers.length * 2);
  61         }
  62         else {
  63             lineNumbers[lineNumber - 1] = parse.getCurrentOutputLineNumber();
  64             lineNumber++;
  65         }
  66         super.println();
  67     }
  68
  69     private Object resizeArray (Object oldArray, int newSize) {
  70        int oldSize = java.lang.reflect.Array.getLength(oldArray);
  71        Class elementType = oldArray.getClass().getComponentType();
  72        Object newArray = java.lang.reflect.Array.newInstance(
  73              elementType,newSize);
  74        int preserveLength = Math.min(oldSize,newSize);
  75        if (preserveLength > 0)
  76           System.arraycopy (oldArray,0,newArray,0,preserveLength);
  77        return newArray;
  78    }
  79
  80     public int getCurrentLineNumber() {
  81         return this.lineNumber;
  82     }
  83
  84     public int[] getLineNumbers() {
  85         return lineNumbers;
  86     }
  87 }