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/* |
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* The Apache Software License, Version 1.1 |
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* |
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* Copyright (c) 2002 The Apache Software Foundation. All rights |
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* reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if |
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* any, must include the following acknowlegement: |
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* "This product includes software developed by the |
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* Apache Software Foundation (http://www.apache.org/)." |
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* Alternately, this acknowlegement may appear in the software itself, |
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* if and wherever such third-party acknowlegements normally appear. |
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* |
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* 4. The names "The Jakarta Project", "Ant", and "Apache Software |
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* Foundation" must not be used to endorse or promote products derived |
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* from this software without prior written permission. For written |
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* permission, please contact apache@apache.org. |
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* |
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* 5. Products derived from this software may not be called "Apache" |
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* nor may "Apache" appear in their names without prior written |
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* permission of the Apache Group. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of the Apache Software Foundation. For more |
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* information on the Apache Software Foundation, please see |
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* <http://www.apache.org/>. |
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*/ |
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package org.apache.tools.ant.taskdefs.condition; |
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import org.apache.tools.ant.BuildException; |
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import java.io.BufferedInputStream; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.IOException; |
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/** |
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* compare two files for bitwise equality based on size and content. timestamps |
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* are not looked at at all. |
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* |
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* @author Steve Loughran |
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* @created 12 January 2002 |
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* @since Ant 1.5 |
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*/ |
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public class FilesMatch implements Condition { |
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/** |
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* files to compare |
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*/ |
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private File file1, file2; |
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/** |
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* Sets the File1 attribute |
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* |
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* @param file1 The new File1 value |
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*/ |
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public void setFile1(File file1) { |
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this.file1 = file1; |
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} |
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/** |
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* Sets the File2 attribute |
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* |
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* @param file2 The new File2 value |
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*/ |
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public void setFile2(File file2) { |
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this.file2 = file2; |
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} |
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/** |
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* simple but sub-optimal comparision algorithm. |
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* written for working rather than fast. Better would |
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* be a block read into buffers followed by long comparisions |
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* apart from the final 1-7 bytes. |
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*/ |
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public boolean simpleFileCompare(File f1,File f2) throws IOException { |
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BufferedInputStream in1=null; |
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BufferedInputStream in2=null; |
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boolean matches=true; |
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try { |
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in1=new BufferedInputStream(new FileInputStream(f1)); |
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in2=new BufferedInputStream(new FileInputStream(f2)); |
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int c1,c2; |
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do { |
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c1=in1.read(); |
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c2=in2.read(); |
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if(c1!=c2) { |
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matches=false; |
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} |
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} while(matches && (c1!=-1)); |
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} finally { |
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try { |
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if(in1!=null) { |
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in1.close(); |
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} |
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} catch(IOException e) { } |
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try { |
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if(in2!=null) { |
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in2.close(); |
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} |
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} catch(IOException e) { } |
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} |
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return matches; |
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} |
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/** |
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* comparision method of the interface |
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* |
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* @return true if the files are equal |
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* @exception BuildException if it all went pear-shaped |
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*/ |
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public boolean eval() |
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throws BuildException { |
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//validate |
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if (file1 == null || file2 == null) { |
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throw new BuildException("both file1 and file2 are required in fileequals"); |
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} |
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if (!file1.exists()) { |
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throw new BuildException("file " + file1 + " not found"); |
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} |
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if (!file2.exists()) { |
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throw new BuildException("file " + file2 + " not found"); |
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} |
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//shortcut tests |
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//#1 : same filename => true |
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if(file1.equals(file2)) { |
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return true; |
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} |
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//#2 : different size =>false |
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if(file1.length()!=file2.length()) { |
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return false; |
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} |
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//#now match the files |
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boolean matches=false; |
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try { |
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matches=simpleFileCompare(file1,file2); |
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} catch(IOException ioe) { |
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throw new BuildException("when comparing files", ioe); |
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} |
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return matches; |
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} |
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} |
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Steve Loughran