1 files changed, 151 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ChecksumAlgorithm.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ChecksumAlgorithm.java
new file mode 100644
index 00000000..210d5dc9
--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/selectors/modifiedselector/ChecksumAlgorithm.java
@@ -0,0 +1,151 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.security.NoSuchAlgorithmException;
+import java.util.Locale;
+import java.util.zip.Adler32;
+import java.util.zip.CRC32;
+import java.util.zip.CheckedInputStream;
+import java.util.zip.Checksum;
+
+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 <param>s.
+ * Supported <param>s are:
+ * <table>
+ * <tr>
+ *   <th>name</th><th>values</th><th>description</th><th>required</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 != null ? algorithm.toUpperCase(Locale.ENGLISH) : null;
+    }
+
+
+    /** Initialize the checksum interface. */
+    public void initChecksum() {
+        if (checksum != null) {
+            return;
+        }
+        if ("CRC".equals(algorithm)) {
+            checksum = new CRC32();
+        } else if ("ADLER".equals(algorithm)) {
+            checksum = new Adler32();
+        } else {
+            throw new BuildException(new NoSuchAlgorithmException());
+        }
+    }
+
+
+    // -----  Logic  -----
+
+
+    /**
+     * This algorithm supports only CRC and Adler.
+     * @return <i>true</i> if all is ok, otherwise <i>false</i>.
+     */
+    public boolean isValid() {
+        return "CRC".equals(algorithm) || "ADLER".equals(algorithm);
+    }
+
+
+    /**
+     * Computes a value for a file content with the specified checksum algorithm.
+     * @param file    File object for which the value should be evaluated.
+     * @return        The 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() {
+        StringBuilder buf = new StringBuilder();
+        buf.append("<ChecksumAlgorithm:");
+        buf.append("algorithm=").append(algorithm);
+        buf.append(">");
+        return buf.toString();
+    }
+}