Author: mbenson
Date: Mon Feb 21 22:06:57 2011
New Revision: 1073166
URL: http://svn.apache.org/viewvc?rev=1073166&view=rev
Log:
add default Equator implementation
Added:
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
(with props)
Added:
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
URL:
http://svn.apache.org/viewvc/commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java?rev=1073166&view=auto
==============================================================================
---
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
(added)
+++
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
Mon Feb 21 22:06:57 2011
@@ -0,0 +1,66 @@
+/*
+ * 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.commons.collections.functors;
+
+/**
+ * Default {@link Equator} implementation.
+ *
+ * @param <T>
+ * @since Commons Collections 4.0
+ * @version $Revision$ $Date$
+ */
+public class DefaultEquator<T> implements Equator<T> {
+ /** Static instance */
+ public static final DefaultEquator<Object> INSTANCE = new
DefaultEquator<Object>();
+
+ /**
+ * Hashcode used for <code>null</code> objects.
+ */
+ public static final int HASHCODE_NULL = -1;
+
+ /**
+ * {@inheritDoc} Delegates to {@link Object#equals(Object)}.
+ */
+ public boolean equate(T o1, T o2) {
+ return o1 == o2 || o1 != null && o1.equals(o2);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * @return <code>o.hashCode()</code> if <code>o</code> is non-
+ * <code>null</code>, else {@link #HASHCODE_NULL}.
+ */
+ public int hash(T o) {
+ return o == null ? HASHCODE_NULL : o.hashCode();
+ }
+
+ private Object readResolve() {
+ return INSTANCE;
+ }
+
+ /**
+ * Get a typed {@link DefaultEquator} instance.
+ *
+ * @param <T>
+ * @return {@link DefaultEquator#INSTANCE}
+ */
+ @SuppressWarnings("unchecked")
+ public static <T> DefaultEquator<T> instance() {
+ return (DefaultEquator<T>) DefaultEquator.INSTANCE;
+ }
+}
Propchange:
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
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svn:eol-style = native
Propchange:
commons/proper/collections/trunk/src/java/org/apache/commons/collections/functors/DefaultEquator.java
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svn:keywords = Date Author Id Revision HeadURL
