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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;

import java.lang.reflect.Type;

import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.reflect.TypeUtils;
import org.apache.commons.lang3.tuple.Pair;

/**
 * 

* A {@code Diff} contains the differences between two {@link Diffable} class * fields. *

* *

* Typically, {@code Diff}s are retrieved by using a {@link DiffBuilder} to * produce a {@link DiffResult}, containing the differences between two objects. *

* * * @param * The type of object contained within this {@code Diff}. Differences * between primitive objects are stored as their Object wrapper * equivalent. * @since 3.3 */ public abstract class Diff extends Pair { private static final long serialVersionUID = 1L; private final Type type; private final String fieldName; /** *

* Constructs a new {@code Diff} for the given field name. *

* * @param fieldName * the name of the field */ protected Diff(final String fieldName) { this.type = ObjectUtils.defaultIfNull( TypeUtils.getTypeArguments(getClass(), Diff.class).get( Diff.class.getTypeParameters()[0]), Object.class); this.fieldName = fieldName; } /** *

* Returns the type of the field. *

* * @return the field type */ public final Type getType() { return type; } /** *

* Returns the name of the field. *

* * @return the field name */ public final String getFieldName() { return fieldName; } /** *

* Returns a {@code String} representation of the {@code Diff}, with the * following format:

* *
     * [fieldname: left-value, right-value]
     * 
* * * @return the string representation */ @Override public final String toString() { return String.format("[%s: %s, %s]", fieldName, getLeft(), getRight()); } /** *

* Throws {@code UnsupportedOperationException}. *

* * @param value * ignored * @return nothing */ @Override public final T setValue(final T value) { throw new UnsupportedOperationException("Cannot alter Diff object."); } }




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