Rounding out signature of DeweyDecimal and writing some tests.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1373811 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/util/DeweyDecimal.java

@@ -28,10 +28,10 @@ import java.util.StringTokenizer;
  * must begin with a number.
  *
  */
-public class DeweyDecimal {
+public class DeweyDecimal implements Comparable<DeweyDecimal> {
 
     /** Array of components that make up DeweyDecimal */
-    private int[] components;
+    private final int[] components;
 
     /**
      * Construct a DeweyDecimal from an array of integer components.
@@ -58,7 +58,7 @@ public class DeweyDecimal {
 
         for (int i = 0; i < components.length; i++) {
             final String component = tokenizer.nextToken();
-            if (component.equals("")) {
+            if (component.length() == 0) {
                 throw new NumberFormatException("Empty component in string");
             }
 
@@ -194,7 +194,7 @@ public class DeweyDecimal {
      *
      * @return the string representation of DeweyDecimal.
      */
-    public String toString() {
+    @Override public String toString() {
         final StringBuffer sb = new StringBuffer();
 
         for (int i = 0; i < components.length; i++) {
@@ -206,4 +206,25 @@ public class DeweyDecimal {
 
         return sb.toString();
     }
+
+    @Override public int compareTo(DeweyDecimal other) {
+        final int max = Math.max(other.components.length, components.length);
+        for (int i = 0; i < max; i++) {
+            final int component1 = (i < components.length) ? components[ i ] : 0;
+            final int component2 = (i < other.components.length) ? other.components[ i ] : 0;
+            if (component1 != component2) {
+                return component1 - component2;
+            }
+        }
+        return 0;
+    }
+
+    @Override public int hashCode() {
+        return toString().hashCode();
+    }
+
+    @Override public boolean equals(Object o) {
+        return o instanceof DeweyDecimal && isEqual((DeweyDecimal) o);
+    }
+
 }

src/tests/junit/org/apache/tools/ant/util/DeweyDecimalTest.java

@@ -0,0 +1,68 @@
+/*
+ *  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.util;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+@SuppressWarnings("ResultOfObjectAllocationIgnored")
+public class DeweyDecimalTest {
+
+    @Test public void parse() {
+        assertEquals("1.2.3", new DeweyDecimal("1.2.3").toString());
+    }
+
+    @Test(expected=NumberFormatException.class) public void misparseEmpty() {
+        new DeweyDecimal("1..2");
+    }
+
+    @Test(expected=NumberFormatException.class) public void misparseNonNumeric() {
+        new DeweyDecimal("1.2.3-beta-5");
+    }
+
+    @Test(expected=NumberFormatException.class) public void misparseFinalDot() {
+        new DeweyDecimal("1.2.");
+    }
+
+    // XXX initial dots, empty string, null, negative numbers, ...
+
+    @Test public void testHashCode() {
+        assertEquals(new DeweyDecimal("1.2.3").hashCode(), new DeweyDecimal("1.2.3").hashCode());
+    }
+
+    @Test public void testEquals() {
+        assertTrue(new DeweyDecimal("1.2.3").equals(new DeweyDecimal("1.2.3")));
+        assertFalse(new DeweyDecimal("1.2.3").equals(new DeweyDecimal("1.2.4")));
+        assertTrue(new DeweyDecimal("1.2.0").equals(new DeweyDecimal("1.2")));
+        assertTrue(new DeweyDecimal("1.2").equals(new DeweyDecimal("1.2.0")));
+    }
+
+    @Test public void compareTo() {
+        assertTrue(new DeweyDecimal("1.2.3").compareTo(new DeweyDecimal("1.2")) > 0);
+        assertTrue(new DeweyDecimal("1.2").compareTo(new DeweyDecimal("1.2.3")) < 0);
+        assertTrue(new DeweyDecimal("1.2.3").compareTo(new DeweyDecimal("1.2.3")) == 0);
+        assertTrue(new DeweyDecimal("1.2.3").compareTo(new DeweyDecimal("1.1.4")) > 0);
+        assertTrue(new DeweyDecimal("1.2.3").compareTo(new DeweyDecimal("1.2.2.9")) > 0);
+        assertTrue(new DeweyDecimal("1.2.0").compareTo(new DeweyDecimal("1.2")) == 0);
+        assertTrue(new DeweyDecimal("1.2").compareTo(new DeweyDecimal("1.2.0")) == 0);
+    }
+
+    // XXX isGreaterThan, ...
+
+}