Make protobuf java JDK 1.5 compatible.

java/src/main/java/com/google/protobuf/GeneratedMessage.java

@@ -421,7 +421,7 @@ public abstract class GeneratedMessage extends AbstractMessage
       return true;
     }
 
-    @Override
+    //@Override (Java
     public final UnknownFieldSet getUnknownFields() {
       return unknownFields;
     }
@@ -445,7 +445,7 @@ public abstract class GeneratedMessage extends AbstractMessage
      */
     private class BuilderParentImpl implements BuilderParent {
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void markDirty() {
         onChanged();
       }
@@ -1130,7 +1130,7 @@ public abstract class GeneratedMessage extends AbstractMessage
     // obtained.
     return new GeneratedExtension<ContainingType, Type>(
         new ExtensionDescriptorRetriever() {
-          @Override
+          //@Override (Java 1.6 override semantics, but we must support 1.5)
           public FieldDescriptor getDescriptor() {
             return scope.getDescriptorForType().getExtensions()
                 .get(descriptorIndex);
@@ -1225,7 +1225,7 @@ public abstract class GeneratedMessage extends AbstractMessage
         throw new IllegalStateException("Already initialized.");
       }
       descriptorRetriever = new ExtensionDescriptorRetriever() {
-          @Override
+          //@Override (Java 1.6 override semantics, but we must support 1.5)
           public FieldDescriptor getDescriptor() {
             return descriptor;
           }

java/src/main/java/com/google/protobuf/RepeatedFieldBuilder.java

@@ -573,7 +573,7 @@ public class RepeatedFieldBuilder
     }
   }
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public void markDirty() {
     onChanged();
   }

java/src/main/java/com/google/protobuf/SingleFieldBuilder.java

@@ -234,7 +234,7 @@ public class SingleFieldBuilder
     }
   }
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public void markDirty() {
     onChanged();
   }

java/src/main/java/com/google/protobuf/SmallSortedMap.java

@@ -411,22 +411,22 @@ class SmallSortedMap<K extends Comparable<K>, V> extends AbstractMap<K, V> {
       this.value = value;
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public K getKey() {
       return key;
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public V getValue() {
       return value;
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public int compareTo(Entry other) {
       return getKey().compareTo(other.getKey());
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public V setValue(V newValue) {
       checkMutable();
       final V oldValue = this.value;
@@ -535,13 +535,13 @@ class SmallSortedMap<K extends Comparable<K>, V> extends AbstractMap<K, V> {
     private boolean nextCalledBeforeRemove;
     private Iterator<Map.Entry<K, V>> lazyOverflowIterator;
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public boolean hasNext() {
       return (pos + 1) < entryList.size() ||
           getOverflowIterator().hasNext();
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public Map.Entry<K, V> next() {
       nextCalledBeforeRemove = true;
       // Always increment pos so that we know whether the last returned value
@@ -552,7 +552,7 @@ class SmallSortedMap<K extends Comparable<K>, V> extends AbstractMap<K, V> {
       return getOverflowIterator().next();
     }
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public void remove() {
       if (!nextCalledBeforeRemove) {
         throw new IllegalStateException("remove() was called before next()");
@@ -589,22 +589,22 @@ class SmallSortedMap<K extends Comparable<K>, V> extends AbstractMap<K, V> {
   private static class EmptySet {
 
     private static final Iterator<Object> ITERATOR = new Iterator<Object>() {
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public boolean hasNext() {
         return false;
       }
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public Object next() {
         throw new NoSuchElementException();
       }
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void remove() {
         throw new UnsupportedOperationException();
       }
     };
 
     private static final Iterable<Object> ITERABLE = new Iterable<Object>() {
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public Iterator<Object> iterator() {
         return ITERATOR;
       }

java/src/main/java/com/google/protobuf/UnmodifiableLazyStringList.java

@@ -60,62 +60,62 @@ public class UnmodifiableLazyStringList extends AbstractList<String>
     return list.size();
   }
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public ByteString getByteString(int index) {
     return list.getByteString(index);
   }
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public void add(ByteString element) {
     throw new UnsupportedOperationException();
   }
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public ListIterator<String> listIterator(final int index) {
     return new ListIterator<String>() {
       ListIterator<String> iter = list.listIterator(index);
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public boolean hasNext() {
         return iter.hasNext();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public String next() {
         return iter.next();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public boolean hasPrevious() {
         return iter.hasPrevious();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public String previous() {
         return iter.previous();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public int nextIndex() {
         return iter.nextIndex();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public int previousIndex() {
         return iter.previousIndex();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void remove() {
         throw new UnsupportedOperationException();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void set(String o) {
         throw new UnsupportedOperationException();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void add(String o) {
         throw new UnsupportedOperationException();
       }
@@ -127,17 +127,17 @@ public class UnmodifiableLazyStringList extends AbstractList<String>
     return new Iterator<String>() {
       Iterator<String> iter = list.iterator();
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public boolean hasNext() {
         return iter.hasNext();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public String next() {
         return iter.next();
       }
 
-      @Override
+      //@Override (Java 1.6 override semantics, but we must support 1.5)
       public void remove() {
         throw new UnsupportedOperationException();
       }

java/src/test/java/com/google/protobuf/ForceFieldBuildersPreRun.java

@@ -41,7 +41,7 @@ package com.google.protobuf;
  */
 public class ForceFieldBuildersPreRun implements Runnable {
 
-  @Override
+  //@Override (Java 1.6 override semantics, but we must support 1.5)
   public void run() {
     GeneratedMessage.enableAlwaysUseFieldBuildersForTesting();
   }

java/src/test/java/com/google/protobuf/SmallSortedMapTest.java

@@ -32,7 +32,6 @@ package com.google.protobuf;
 
 import junit.framework.TestCase;
 
-import java.util.AbstractMap.SimpleEntry;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -46,6 +45,49 @@ import java.util.TreeSet;
  * @author darick@google.com Darick Tong
  */
 public class SmallSortedMapTest extends TestCase {
+  // java.util.AbstractMap.SimpleEntry is private in JDK 1.5. We re-implement it
+  // here for JDK 1.5 users.
+  private static class SimpleEntry<K, V> implements Map.Entry<K, V> {
+    private final K key;
+    private V value;
+
+    SimpleEntry(K key, V value) {
+      this.key = key;
+      this.value = value;
+    }
+
+    public K getKey() {
+      return key;
+    }
+
+    public V getValue() {
+      return value;
+    }
+
+    public V setValue(V value) {
+      V oldValue = this.value;
+      this.value = value;
+      return oldValue;
+    }
+
+    private static boolean eq(Object o1, Object o2) {
+      return o1 == null ? o2 == null : o1.equals(o2);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (!(o instanceof Map.Entry))
+        return false;
+      Map.Entry e = (Map.Entry) o;
+      return eq(key, e.getKey()) && eq(value, e.getValue());
+    }
+
+    @Override
+    public int hashCode() {
+      return ((key == null) ? 0 : key.hashCode()) ^
+          ((value == null) ? 0 : value.hashCode());
+    }
+  }
 
   public void testPutAndGetArrayEntriesOnly() {
     runPutAndGetTest(3);

java/src/test/java/com/google/protobuf/TestUtil.java

@@ -3799,7 +3799,7 @@ public final class TestUtil {
 
     private int invalidations;
 
-    @Override
+    //@Override (Java 1.6 override semantics, but we must support 1.5)
     public void markDirty() {
       invalidations++;
     }