Adding exists method for content item

archiva-modules/archiva-base/archiva-repository-api/src/main/java/org/apache/archiva/repository/content/ContentItem.java

@@ -75,4 +75,10 @@ public interface ContentItem
      */
     ManagedRepositoryContent getRepository( );
 
+    /**
+     * Returns <code>true</code>, if the item exists, otherwise <code>false</code>
+     * @return <code>true</code>, if the item exists, otherwise <code>false</code>
+     */
+    boolean exists();
+
 }

archiva-modules/archiva-base/archiva-repository-layer/src/main/java/org/apache/archiva/repository/content/base/ArchivaContentItem.java

@@ -181,6 +181,7 @@ public abstract class ArchivaContentItem implements ContentItem
 
         protected abstract N getNextBuilder( );
 
+        @Override
         public WithAssetBuilder<N> withRepository( ManagedRepositoryContent repository )
         {
             if ( repository == null )
@@ -191,6 +192,7 @@ public abstract class ArchivaContentItem implements ContentItem
             return this;
         }
 
+        @Override
         public N withAsset( StorageAsset asset )
         {
             if ( asset == null )
@@ -201,6 +203,7 @@ public abstract class ArchivaContentItem implements ContentItem
             return getNextBuilder( );
         }
 
+        @Override
         public O withAttribute( String key, String value )
         {
             if ( StringUtils.isEmpty( key ) )
@@ -216,10 +219,17 @@ public abstract class ArchivaContentItem implements ContentItem
             ( (ArchivaContentItem) item ).repository = repository;
         }
 
+        @Override
         public I build( )
         {
             return item;
         }
 
     }
+
+    @Override
+    public boolean exists( )
+    {
+        return asset.exists( );
+    }
 }