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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2009 Eric Lafortune (eric (at) graphics.cornell.edu)
      6  *
      7  * This program is free software; you can redistribute it and/or modify it
      8  * under the terms of the GNU General Public License as published by the Free
      9  * Software Foundation; either version 2 of the License, or (at your option)
     10  * any later version.
     11  *
     12  * This program is distributed in the hope that it will be useful, but WITHOUT
     13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
     15  * more details.
     16  *
     17  * You should have received a copy of the GNU General Public License along
     18  * with this program; if not, write to the Free Software Foundation, Inc.,
     19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
     20  */
     21 package proguard.classfile.editor;
     22 
     23 import proguard.classfile.attribute.*;
     24 
     25 /**
     26  * This class can add line numbers to a given line number table attribute.
     27  * Line numbers to be added must have been filled out beforehand.
     28  *
     29  * @author Eric Lafortune
     30  */
     31 public class LineNumberTableAttributeEditor
     32 {
     33     private LineNumberTableAttribute targetLineNumberTableAttribute;
     34 
     35 
     36     /**
     37      * Creates a new LineNumberTableAttributeEditor that will edit line numbers
     38      * in the given line number table attribute.
     39      */
     40     public LineNumberTableAttributeEditor(LineNumberTableAttribute targetLineNumberTableAttribute)
     41     {
     42         this.targetLineNumberTableAttribute = targetLineNumberTableAttribute;
     43     }
     44 
     45 
     46     /**
     47      * Adds a given line number to the line number table attribute.
     48      */
     49     public void addLineNumberInfo(LineNumberInfo lineNumberInfo)
     50     {
     51         int              lineNumberTableLength = targetLineNumberTableAttribute.u2lineNumberTableLength;
     52         LineNumberInfo[] lineNumberTable       = targetLineNumberTableAttribute.lineNumberTable;
     53 
     54         // Make sure there is enough space for the new lineNumberInfo.
     55         if (lineNumberTable.length <= lineNumberTableLength)
     56         {
     57             targetLineNumberTableAttribute.lineNumberTable = new LineNumberInfo[lineNumberTableLength+1];
     58             System.arraycopy(lineNumberTable, 0,
     59                              targetLineNumberTableAttribute.lineNumberTable, 0,
     60                              lineNumberTableLength);
     61             lineNumberTable = targetLineNumberTableAttribute.lineNumberTable;
     62         }
     63 
     64         // Add the lineNumberInfo.
     65         lineNumberTable[targetLineNumberTableAttribute.u2lineNumberTableLength++] = lineNumberInfo;
     66     }
     67 }