jhm 2004/07/10 10:22:21
Added: src/main/org/apache/tools/ant/types/selectors/modifiedselector
ChecksumAlgorithm.java
Log:
Forgot to add the Checksum
Revision ChangesPath
1.1
ant/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ChecksumAlgorithm.java
Index: ChecksumAlgorithm.java
===
/*
* Copyright 2003-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.types.selectors.modifiedselector;
import java.util.zip.Checksum;
import java.util.zip.CRC32;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.security.NoSuchAlgorithmException;
import org.apache.tools.ant.BuildException;
/**
* Computes a 'checksum' for the content of file using
* java.util.zip.CRC32 and java.util.zip.Adler32.
* Use of this algorithm doesn't require any additional nested params.
* Supported params are:
* table
* tr
* thname/ththvalues/ththdescription/ththrequired/th
* /tr
* tr
* td algorithm.algorithm /td
* td ADLER | CRC ( default ) /td
* td name of the algorithm the checksum should use /td
* td no, defaults to CRC /td
* /tr
* /table
*
* @version 2004-06-17
* @since Ant 1.7
*/
public class ChecksumAlgorithm implements Algorithm {
// - member variables -
/**
* Checksum algorithm to be used.
*/
private String algorithm = CRC;
/**
* Checksum interface instance
*/
private Checksum checksum = null;
// - Algorithm-Configuration -
/**
* Specifies the algorithm to be used to compute the checksum.
* Defaults to CRC. Other popular algorithms like ADLER may be used
as well.
* @param algorithm the digest algorithm to use
*/
public void setAlgorithm(String algorithm) {
this.algorithm = algorithm;
}
/** Initialize the checksum interface. */
public void initChecksum() {
if (checksum != null) {
return;
}
if (CRC.equalsIgnoreCase(algorithm)) {
checksum = new CRC32();
} else if (ADLER.equalsIgnoreCase(algorithm)) {
checksum = new Adler32();
} else {
throw new BuildException(new NoSuchAlgorithmException());
}
}
// - Logic -
/**
* This algorithm supports only CRC and Adler.
* @return itrue/i if all is ok, otherwise ifalse/i.
*/
public boolean isValid() {
return CRC.equalsIgnoreCase(algorithm) ||
ADLER.equalsIgnoreCase(algorithm);
}
/**
* Computes a value for a file content with the specified checksum
algorithm.
* @param fileFile object for which the value should be evaluated.
* @returnThe value for that file
*/
public String getValue(File file) {
initChecksum();
String rval = null;
try {
if (file.canRead()) {
checksum.reset();
FileInputStream fis = new FileInputStream(file);
CheckedInputStream check = new CheckedInputStream(fis,
checksum);
BufferedInputStream in = new BufferedInputStream(check);
while (in.read() != -1) {
// Read the file
}
rval = Long.toString(check.getChecksum().getValue());
in.close();
}
} catch (Exception e) {
rval = null;
}
return rval;
}
/**
* Override Object.toString().
* @return some information about this algorithm.
*/
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append(ChecksumAlgorithm:);
buf.append(algorithm=).append(algorithm);
buf.append();
return buf.toString();
}
}
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