LongSerializationPolicy.java

/*
 * Copyright (C) 2009 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;

/**
 * Defines the expected format for a {@code long} or {@code Long} type when its
 * serialized.
 * 
 * @since 1.3
 * 
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public enum LongSerializationPolicy {
	/**
	 * This is the "default" serialization policy that will output a
	 * {@code long} object as a JSON number. For example, assume an object has a
	 * long field named "f" then the serialized output would be: {@code
	 * "f":123}}.
	 */
	DEFAULT(new DefaultStrategy()),

	/**
	 * Serializes a long value as a quoted string. For example, assume an object
	 * has a long field named "f" then the serialized output would be: {@code
	 * "f":"123"}}.
	 */
	STRING(new StringStrategy());

	private final Strategy strategy;

	private LongSerializationPolicy(Strategy strategy) {
		this.strategy = strategy;
	}

	/**
	 * Serialize this {@code value} using this serialization policy.
	 * 
	 * @param value
	 *            the long value to be serialized into a {@link JsonElement}
	 * @return the serialized version of {@code value}
	 */
	public JsonElement serialize(Long value) {
		return strategy.serialize(value);
	}

	private interface Strategy {
		JsonElement serialize(Long value);
	}

	private static class DefaultStrategy implements Strategy {
		public JsonElement serialize(Long value) {
			return new JsonPrimitive(value);
		}
	}

	private static class StringStrategy implements Strategy {
		public JsonElement serialize(Long value) {
			return new JsonPrimitive(String.valueOf(value));
		}
	}
}