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From a..@apache.org
Subject svn commit: r1561861 - in /hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common: ./ dev-support/ src/main/java/org/apache/hadoop/util/ src/test/java/org/apache/hadoop/util/
Date Mon, 27 Jan 2014 21:39:02 GMT
Author: atm
Date: Mon Jan 27 21:39:01 2014
New Revision: 1561861

URL: http://svn.apache.org/r1561861
Log:
HADOOP-10250. VersionUtil returns wrong value when comparing two versions. Contributed by
Yongjun Zhang.

Added:
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ComparableVersion.java
Modified:
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionUtil.java
    hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestVersionUtil.java

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt?rev=1561861&r1=1561860&r2=1561861&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt (original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/CHANGES.txt Mon Jan
27 21:39:01 2014
@@ -243,6 +243,9 @@ Release 2.4.0 - UNRELEASED
     HADOOP-10203. Connection leak in
     Jets3tNativeFileSystemStore#retrieveMetadata. (Andrei Savu via atm)
 
+    HADOOP-10250. VersionUtil returns wrong value when comparing two versions.
+    (Yongjun Zhang via atm)
+
 Release 2.3.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml?rev=1561861&r1=1561860&r2=1561861&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml
(original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/dev-support/findbugsExcludeFile.xml
Mon Jan 27 21:39:01 2014
@@ -364,4 +364,11 @@
       <Bug pattern="OBL_UNSATISFIED_OBLIGATION"/>
     </Match>
 
+     <!-- code from maven source, null value is checked at callee side. -->
+     <Match>
+       <Class name="org.apache.hadoop.util.ComparableVersion$ListItem" />
+       <Method name="compareTo" />
+       <Bug code="NP" />
+     </Match>
+
 </FindBugsFilter>

Added: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ComparableVersion.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ComparableVersion.java?rev=1561861&view=auto
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ComparableVersion.java
(added)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ComparableVersion.java
Mon Jan 27 21:39:01 2014
@@ -0,0 +1,479 @@
+// Code source of this file: 
+//   http://grepcode.com/file/repo1.maven.org/maven2/
+//     org.apache.maven/maven-artifact/3.1.1/
+//       org/apache/maven/artifact/versioning/ComparableVersion.java/
+//
+// Modifications made on top of the source:
+//   1. Changed
+//        package org.apache.maven.artifact.versioning;
+//      to
+//        package org.apache.hadoop.util;
+//   2. Removed author tags to clear hadoop author tag warning
+//        author <a href="mailto:kenney@apache.org">Kenney Westerhof</a>
+//        author <a href="mailto:hboutemy@apache.org">Hervé Boutemy</a>
+//
+package org.apache.hadoop.util;
+
+/*
+ * 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.
+ */
+
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Locale;
+import java.util.Properties;
+import java.util.Stack;
+
+/**
+ * Generic implementation of version comparison.
+ * 
+ * <p>Features:
+ * <ul>
+ * <li>mixing of '<code>-</code>' (dash) and '<code>.</code>'
(dot) separators,</li>
+ * <li>transition between characters and digits also constitutes a separator:
+ *     <code>1.0alpha1 =&gt; [1, 0, alpha, 1]</code></li>
+ * <li>unlimited number of version components,</li>
+ * <li>version components in the text can be digits or strings,</li>
+ * <li>strings are checked for well-known qualifiers and the qualifier ordering is
used for version ordering.
+ *     Well-known qualifiers (case insensitive) are:<ul>
+ *     <li><code>alpha</code> or <code>a</code></li>
+ *     <li><code>beta</code> or <code>b</code></li>
+ *     <li><code>milestone</code> or <code>m</code></li>
+ *     <li><code>rc</code> or <code>cr</code></li>
+ *     <li><code>snapshot</code></li>
+ *     <li><code>(the empty string)</code> or <code>ga</code>
or <code>final</code></li>
+ *     <li><code>sp</code></li>
+ *     </ul>
+ *     Unknown qualifiers are considered after known qualifiers, with lexical order (always
case insensitive),
+ *   </li>
+ * <li>a dash usually precedes a qualifier, and is always less important than something
preceded with a dot.</li>
+ * </ul></p>
+ *
+ * @see <a href="https://cwiki.apache.org/confluence/display/MAVENOLD/Versioning">"Versioning"
on Maven Wiki</a>
+ */
+public class ComparableVersion
+    implements Comparable<ComparableVersion>
+{
+    private String value;
+
+    private String canonical;
+
+    private ListItem items;
+
+    private interface Item
+    {
+        int INTEGER_ITEM = 0;
+        int STRING_ITEM = 1;
+        int LIST_ITEM = 2;
+
+        int compareTo( Item item );
+
+        int getType();
+
+        boolean isNull();
+    }
+
+    /**
+     * Represents a numeric item in the version item list.
+     */
+    private static class IntegerItem
+        implements Item
+    {
+        private static final BigInteger BIG_INTEGER_ZERO = new BigInteger( "0" );
+
+        private final BigInteger value;
+
+        public static final IntegerItem ZERO = new IntegerItem();
+
+        private IntegerItem()
+        {
+            this.value = BIG_INTEGER_ZERO;
+        }
+
+        public IntegerItem( String str )
+        {
+            this.value = new BigInteger( str );
+        }
+
+        public int getType()
+        {
+            return INTEGER_ITEM;
+        }
+
+        public boolean isNull()
+        {
+            return BIG_INTEGER_ZERO.equals( value );
+        }
+
+        public int compareTo( Item item )
+        {
+            if ( item == null )
+            {
+                return BIG_INTEGER_ZERO.equals( value ) ? 0 : 1; // 1.0 == 1, 1.1 > 1
+            }
+
+            switch ( item.getType() )
+            {
+                case INTEGER_ITEM:
+                    return value.compareTo( ( (IntegerItem) item ).value );
+
+                case STRING_ITEM:
+                    return 1; // 1.1 > 1-sp
+
+                case LIST_ITEM:
+                    return 1; // 1.1 > 1-1
+
+                default:
+                    throw new RuntimeException( "invalid item: " + item.getClass() );
+            }
+        }
+
+        public String toString()
+        {
+            return value.toString();
+        }
+    }
+
+    /**
+     * Represents a string in the version item list, usually a qualifier.
+     */
+    private static class StringItem
+        implements Item
+    {
+        private static final String[] QUALIFIERS = { "alpha", "beta", "milestone", "rc",
"snapshot", "", "sp" };
+
+        private static final List<String> _QUALIFIERS = Arrays.asList( QUALIFIERS );
+
+        private static final Properties ALIASES = new Properties();
+        static
+        {
+            ALIASES.put( "ga", "" );
+            ALIASES.put( "final", "" );
+            ALIASES.put( "cr", "rc" );
+        }
+
+        /**
+         * A comparable value for the empty-string qualifier. This one is used to determine
if a given qualifier makes
+         * the version older than one without a qualifier, or more recent.
+         */
+        private static final String RELEASE_VERSION_INDEX = String.valueOf( _QUALIFIERS.indexOf(
"" ) );
+
+        private String value;
+
+        public StringItem( String value, boolean followedByDigit )
+        {
+            if ( followedByDigit && value.length() == 1 )
+            {
+                // a1 = alpha-1, b1 = beta-1, m1 = milestone-1
+                switch ( value.charAt( 0 ) )
+                {
+                    case 'a':
+                        value = "alpha";
+                        break;
+                    case 'b':
+                        value = "beta";
+                        break;
+                    case 'm':
+                        value = "milestone";
+                        break;
+                }
+            }
+            this.value = ALIASES.getProperty( value , value );
+        }
+
+        public int getType()
+        {
+            return STRING_ITEM;
+        }
+
+        public boolean isNull()
+        {
+            return ( comparableQualifier( value ).compareTo( RELEASE_VERSION_INDEX ) == 0
);
+        }
+
+        /**
+         * Returns a comparable value for a qualifier.
+         *
+         * This method takes into account the ordering of known qualifiers then unknown qualifiers
with lexical ordering.
+         *
+         * just returning an Integer with the index here is faster, but requires a lot of
if/then/else to check for -1
+         * or QUALIFIERS.size and then resort to lexical ordering. Most comparisons are decided
by the first character,
+         * so this is still fast. If more characters are needed then it requires a lexical
sort anyway.
+         *
+         * @param qualifier
+         * @return an equivalent value that can be used with lexical comparison
+         */
+        public static String comparableQualifier( String qualifier )
+        {
+            int i = _QUALIFIERS.indexOf( qualifier );
+
+            return i == -1 ? ( _QUALIFIERS.size() + "-" + qualifier ) : String.valueOf( i
);
+        }
+
+        public int compareTo( Item item )
+        {
+            if ( item == null )
+            {
+                // 1-rc < 1, 1-ga > 1
+                return comparableQualifier( value ).compareTo( RELEASE_VERSION_INDEX );
+            }
+            switch ( item.getType() )
+            {
+                case INTEGER_ITEM:
+                    return -1; // 1.any < 1.1 ?
+
+                case STRING_ITEM:
+                    return comparableQualifier( value ).compareTo( comparableQualifier( (
(StringItem) item ).value ) );
+
+                case LIST_ITEM:
+                    return -1; // 1.any < 1-1
+
+                default:
+                    throw new RuntimeException( "invalid item: " + item.getClass() );
+            }
+        }
+
+        public String toString()
+        {
+            return value;
+        }
+    }
+
+    /**
+     * Represents a version list item. This class is used both for the global item list and
for sub-lists (which start
+     * with '-(number)' in the version specification).
+     */
+    private static class ListItem
+        extends ArrayList<Item>
+        implements Item
+    {
+        public int getType()
+        {
+            return LIST_ITEM;
+        }
+
+        public boolean isNull()
+        {
+            return ( size() == 0 );
+        }
+
+        void normalize()
+        {
+            for ( ListIterator<Item> iterator = listIterator( size() ); iterator.hasPrevious();
)
+            {
+                Item item = iterator.previous();
+                if ( item.isNull() )
+                {
+                    iterator.remove(); // remove null trailing items: 0, "", empty list
+                }
+                else
+                {
+                    break;
+                }
+            }
+        }
+
+        public int compareTo( Item item )
+        {
+            if ( item == null )
+            {
+                if ( size() == 0 )
+                {
+                    return 0; // 1-0 = 1- (normalize) = 1
+                }
+                Item first = get( 0 );
+                return first.compareTo( null );
+            }
+            switch ( item.getType() )
+            {
+                case INTEGER_ITEM:
+                    return -1; // 1-1 < 1.0.x
+
+                case STRING_ITEM:
+                    return 1; // 1-1 > 1-sp
+
+                case LIST_ITEM:
+                    Iterator<Item> left = iterator();
+                    Iterator<Item> right = ( (ListItem) item ).iterator();
+
+                    while ( left.hasNext() || right.hasNext() )
+                    {
+                        Item l = left.hasNext() ? left.next() : null;
+                        Item r = right.hasNext() ? right.next() : null;
+
+                        // if this is shorter, then invert the compare and mul with -1
+                        int result = l == null ? -1 * r.compareTo( l ) : l.compareTo( r );
+                        
+                        if ( result != 0 )
+                        {
+                            return result;
+                        }
+                    }
+
+                    return 0;
+
+                default:
+                    throw new RuntimeException( "invalid item: " + item.getClass() );
+            }
+        }
+
+        public String toString()
+        {
+            StringBuilder buffer = new StringBuilder( "(" );
+            for ( Iterator<Item> iter = iterator(); iter.hasNext(); )
+            {
+                buffer.append( iter.next() );
+                if ( iter.hasNext() )
+                {
+                    buffer.append( ',' );
+                }
+            }
+            buffer.append( ')' );
+            return buffer.toString();
+        }
+    }
+
+    public ComparableVersion( String version )
+    {
+        parseVersion( version );
+    }
+
+    public final void parseVersion( String version )
+    {
+        this.value = version;
+
+        items = new ListItem();
+
+        version = version.toLowerCase( Locale.ENGLISH );
+
+        ListItem list = items;
+
+        Stack<Item> stack = new Stack<Item>();
+        stack.push( list );
+
+        boolean isDigit = false;
+
+        int startIndex = 0;
+
+        for ( int i = 0; i < version.length(); i++ )
+        {
+            char c = version.charAt( i );
+
+            if ( c == '.' )
+            {
+                if ( i == startIndex )
+                {
+                    list.add( IntegerItem.ZERO );
+                }
+                else
+                {
+                    list.add( parseItem( isDigit, version.substring( startIndex, i ) ) );
+                }
+                startIndex = i + 1;
+            }
+            else if ( c == '-' )
+            {
+                if ( i == startIndex )
+                {
+                    list.add( IntegerItem.ZERO );
+                }
+                else
+                {
+                    list.add( parseItem( isDigit, version.substring( startIndex, i ) ) );
+                }
+                startIndex = i + 1;
+
+                if ( isDigit )
+                {
+                    list.normalize(); // 1.0-* = 1-*
+
+                    if ( ( i + 1 < version.length() ) && Character.isDigit( version.charAt(
i + 1 ) ) )
+                    {
+                        // new ListItem only if previous were digits and new char is a digit,
+                        // ie need to differentiate only 1.1 from 1-1
+                        list.add( list = new ListItem() );
+
+                        stack.push( list );
+                    }
+                }
+            }
+            else if ( Character.isDigit( c ) )
+            {
+                if ( !isDigit && i > startIndex )
+                {
+                    list.add( new StringItem( version.substring( startIndex, i ), true )
);
+                    startIndex = i;
+                }
+
+                isDigit = true;
+            }
+            else
+            {
+                if ( isDigit && i > startIndex )
+                {
+                    list.add( parseItem( true, version.substring( startIndex, i ) ) );
+                    startIndex = i;
+                }
+
+                isDigit = false;
+            }
+        }
+
+        if ( version.length() > startIndex )
+        {
+            list.add( parseItem( isDigit, version.substring( startIndex ) ) );
+        }
+
+        while ( !stack.isEmpty() )
+        {
+            list = (ListItem) stack.pop();
+            list.normalize();
+        }
+
+        canonical = items.toString();
+    }
+
+    private static Item parseItem( boolean isDigit, String buf )
+    {
+        return isDigit ? new IntegerItem( buf ) : new StringItem( buf, false );
+    }
+
+    public int compareTo( ComparableVersion o )
+    {
+        return items.compareTo( o.items );
+    }
+
+    public String toString()
+    {
+        return value;
+    }
+
+    public boolean equals( Object o )
+    {
+        return ( o instanceof ComparableVersion ) && canonical.equals( ( (ComparableVersion)
o ).canonical );
+    }
+
+    public int hashCode()
+    {
+        return canonical.hashCode();
+    }
+}

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionUtil.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionUtil.java?rev=1561861&r1=1561860&r2=1561861&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionUtil.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/VersionUtil.java
Mon Jan 27 21:39:01 2014
@@ -17,55 +17,17 @@
  */
 package org.apache.hadoop.util;
 
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
 import org.apache.hadoop.classification.InterfaceAudience;
 
-import com.google.common.collect.ComparisonChain;
-
+/**
+ * A wrapper class to maven's ComparableVersion class, to comply
+ * with maven's version name string convention 
+ */
 @InterfaceAudience.Private
 public abstract class VersionUtil {
-  
-  private static final Pattern COMPONENT_GROUPS = Pattern.compile("(\\d+)|(\\D+)");
-
-  /**
-   * Suffix added by maven for nightly builds and other snapshot releases.
-   * These releases are considered to precede the non-SNAPSHOT version
-   * with the same version number.
-   */
-  private static final String SNAPSHOT_SUFFIX = "-SNAPSHOT";
-
   /**
-   * This function splits the two versions on &quot;.&quot; and performs a
-   * naturally-ordered comparison of the resulting components. For example, the
-   * version string "0.3" is considered to precede "0.20", despite the fact that
-   * lexical comparison would consider "0.20" to precede "0.3". This method of
-   * comparison is similar to the method used by package versioning systems like
-   * deb and RPM.
-   * 
-   * Version components are compared numerically whenever possible, however a
-   * version component can contain non-numeric characters. When a non-numeric
-   * group of characters is found in a version component, this group is compared
-   * with the similarly-indexed group in the other version component. If the
-   * other group is numeric, then the numeric group is considered to precede the
-   * non-numeric group. If both groups are non-numeric, then a lexical
-   * comparison is performed.
-   * 
-   * If two versions have a different number of components, then only the lower
-   * number of components are compared. If those components are identical
-   * between the two versions, then the version with fewer components is
-   * considered to precede the version with more components.
-   * 
-   * In addition to the above rules, there is one special case: maven SNAPSHOT
-   * releases are considered to precede a non-SNAPSHOT release with an
-   * otherwise identical version number. For example, 2.0-SNAPSHOT precedes
-   * 2.0.
-   * 
-   * This function returns a negative integer if version1 precedes version2, a
-   * positive integer if version2 precedes version1, and 0 if and only if the
-   * two versions' components are identical in value and cardinality.
-   * 
+   * Compares two version name strings using maven's ComparableVersion class.
+   *
    * @param version1
    *          the first version to compare
    * @param version2
@@ -75,58 +37,8 @@ public abstract class VersionUtil {
    *         versions are equal.
    */
   public static int compareVersions(String version1, String version2) {
-    boolean isSnapshot1 = version1.endsWith(SNAPSHOT_SUFFIX);
-    boolean isSnapshot2 = version2.endsWith(SNAPSHOT_SUFFIX);
-    version1 = stripSnapshotSuffix(version1);
-    version2 = stripSnapshotSuffix(version2);
-    
-    String[] version1Parts = version1.split("\\.");
-    String[] version2Parts = version2.split("\\.");
-    
-    for (int i = 0; i < version1Parts.length && i < version2Parts.length; i++)
{
-      String component1 = version1Parts[i];
-      String component2 = version2Parts[i];
-      if (!component1.equals(component2)) {
-        Matcher matcher1 = COMPONENT_GROUPS.matcher(component1);
-        Matcher matcher2 = COMPONENT_GROUPS.matcher(component2);
-        
-        while (matcher1.find() && matcher2.find()) {
-          String group1 = matcher1.group();
-          String group2 = matcher2.group();
-          if (!group1.equals(group2)) {
-            if (isNumeric(group1) && isNumeric(group2)) {
-              return Integer.parseInt(group1) - Integer.parseInt(group2);
-            } else if (!isNumeric(group1) && !isNumeric(group2)) {
-              return group1.compareTo(group2);
-            } else {
-              return isNumeric(group1) ? -1 : 1;
-            }
-          }
-        }
-        return component1.length() - component2.length();
-      }
-    }
-    
-    return ComparisonChain.start()
-      .compare(version1Parts.length, version2Parts.length)
-      .compare(isSnapshot2, isSnapshot1)
-      .result();
-  }
-  
-  private static String stripSnapshotSuffix(String version) {
-    if (version.endsWith(SNAPSHOT_SUFFIX)) {
-      return version.substring(0, version.length() - SNAPSHOT_SUFFIX.length());
-    } else {
-      return version;
-    }
-  }
-
-  private static boolean isNumeric(String s) {
-    try {
-      Integer.parseInt(s);
-      return true;
-    } catch (NumberFormatException nfe) {
-      return false;
-    }
+    ComparableVersion v1 = new ComparableVersion(version1);
+    ComparableVersion v2 = new ComparableVersion(version2);
+    return v1.compareTo(v2);
   }
 }

Modified: hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestVersionUtil.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestVersionUtil.java?rev=1561861&r1=1561860&r2=1561861&view=diff
==============================================================================
--- hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestVersionUtil.java
(original)
+++ hadoop/common/branches/branch-2/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestVersionUtil.java
Mon Jan 27 21:39:01 2014
@@ -28,10 +28,30 @@ public class TestVersionUtil {
     // Equal versions are equal.
     assertEquals(0, VersionUtil.compareVersions("2.0.0", "2.0.0"));
     assertEquals(0, VersionUtil.compareVersions("2.0.0a", "2.0.0a"));
-    assertEquals(0, VersionUtil.compareVersions("1", "1"));
     assertEquals(0, VersionUtil.compareVersions(
         "2.0.0-SNAPSHOT", "2.0.0-SNAPSHOT"));
-    
+
+    assertEquals(0, VersionUtil.compareVersions("1", "1"));
+    assertEquals(0, VersionUtil.compareVersions("1", "1.0"));
+    assertEquals(0, VersionUtil.compareVersions("1", "1.0.0"));
+
+    assertEquals(0, VersionUtil.compareVersions("1.0", "1"));
+    assertEquals(0, VersionUtil.compareVersions("1.0", "1.0"));
+    assertEquals(0, VersionUtil.compareVersions("1.0", "1.0.0"));
+
+    assertEquals(0, VersionUtil.compareVersions("1.0.0", "1"));
+    assertEquals(0, VersionUtil.compareVersions("1.0.0", "1.0"));
+    assertEquals(0, VersionUtil.compareVersions("1.0.0", "1.0.0"));
+
+    assertEquals(0, VersionUtil.compareVersions("1.0.0-alpha-1", "1.0.0-a1"));
+    assertEquals(0, VersionUtil.compareVersions("1.0.0-alpha-2", "1.0.0-a2"));
+    assertEquals(0, VersionUtil.compareVersions("1.0.0-alpha1", "1.0.0-alpha-1"));
+
+    assertEquals(0, VersionUtil.compareVersions("1a0", "1.0.0-alpha-0"));
+    assertEquals(0, VersionUtil.compareVersions("1a0", "1-a0"));
+    assertEquals(0, VersionUtil.compareVersions("1.a0", "1-a0"));
+    assertEquals(0, VersionUtil.compareVersions("1.a0", "1.0.0-alpha-0"));
+
     // Assert that lower versions are lower, and higher versions are higher.
     assertExpectedValues("1", "2.0.0");
     assertExpectedValues("1.0.0", "2");
@@ -51,15 +71,27 @@ public class TestVersionUtil {
     assertExpectedValues("1.0.2a", "1.0.2ab");
     assertExpectedValues("1.0.0a1", "1.0.0a2");
     assertExpectedValues("1.0.0a2", "1.0.0a10");
+    // The 'a' in "1.a" is not followed by digit, thus not treated as "alpha",
+    // and treated larger than "1.0", per maven's ComparableVersion class
+    // implementation.
     assertExpectedValues("1.0", "1.a");
-    assertExpectedValues("1.0", "1.a0");
+    //The 'a' in "1.a0" is followed by digit, thus treated as "alpha-<digit>"
+    assertExpectedValues("1.a0", "1.0");
+    assertExpectedValues("1a0", "1.0");    
+    assertExpectedValues("1.0.1-alpha-1", "1.0.1-alpha-2");    
+    assertExpectedValues("1.0.1-beta-1", "1.0.1-beta-2");
     
     // Snapshot builds precede their eventual releases.
     assertExpectedValues("1.0-SNAPSHOT", "1.0");
-    assertExpectedValues("1.0", "1.0.0-SNAPSHOT");
+    assertExpectedValues("1.0.0-SNAPSHOT", "1.0");
     assertExpectedValues("1.0.0-SNAPSHOT", "1.0.0");
     assertExpectedValues("1.0.0", "1.0.1-SNAPSHOT");
     assertExpectedValues("1.0.1-SNAPSHOT", "1.0.1");
+    assertExpectedValues("1.0.1-SNAPSHOT", "1.0.2");
+    
+    assertExpectedValues("1.0.1-alpha-1", "1.0.1-SNAPSHOT");
+    assertExpectedValues("1.0.1-beta-1", "1.0.1-SNAPSHOT");
+    assertExpectedValues("1.0.1-beta-2", "1.0.1-SNAPSHOT");
   }
   
   private static void assertExpectedValues(String lower, String higher) {



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