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/**
 * 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.lang3.builder;

/**
 * 

{@code Diffable} classes can be compared with other objects * for differences. The {@link DiffResult} object retrieved can be queried * for a list of differences or printed using the {@link DiffResult#toString()}.

* *

The calculation of the differences is consistent with equals if * and only if {@code d1.equals(d2)} implies {@code d1.diff(d2) == ""}. * It is strongly recommended that implementations are consistent with equals * to avoid confusion. Note that {@code null} is not an instance of any class * and {@code d1.diff(null)} should throw a {@code NullPointerException}.

* *

* {@code Diffable} classes lend themselves well to unit testing, in which a * easily readable description of the differences between an anticipated result and * an actual result can be retrieved. For example: *

*
 * Assert.assertEquals(expected.diff(result), expected, result);
 * 
* * @param the type of objects that this object may be differentiated against * @since 3.3 */ public interface Diffable { /** *

Retrieves a list of the differences between * this object and the supplied object.

* * @param obj the object to diff against, can be {@code null} * @return a list of differences * @throws NullPointerException if the specified object is {@code null} */ DiffResult diff(T obj); }




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