SerializedNameAnnotationInterceptingNamingPolicy.java

/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed 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 com.smartandroid.sa.json;

import com.smartandroid.sa.json.annotations.SerializedName;

/**
 * A {@link FieldNamingStrategy2} that acts as a chain of responsibility. If the
 * {@link com.google.gson.annotations.SerializedName} annotation is applied to a
 * field then this strategy will translate the name to the
 * {@code serializedName.value()}; otherwise it delegates to the wrapped
 * {@link FieldNamingStrategy2}.
 * 
 * <p>
 * NOTE: this class performs JSON field name validation for any of the fields
 * marked with an {@code @SerializedName} annotation.
 * </p>
 * 
 * @see SerializedName
 * 
 * @author Joel Leitch
 */
final class SerializedNameAnnotationInterceptingNamingPolicy implements
		FieldNamingStrategy2 {
	private final FieldNamingStrategy2 delegate;

	SerializedNameAnnotationInterceptingNamingPolicy(
			FieldNamingStrategy2 delegate) {
		this.delegate = delegate;
	}

	public String translateName(FieldAttributes f) {
		SerializedName serializedName = f.getAnnotation(SerializedName.class);
		return serializedName == null ? delegate.translateName(f)
				: serializedName.value();
	}
}