/*
 * Copyright 2012 the original author or authors.
 *
 * 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 org.springframework.hateoas;

import org.codehaus.jackson.annotate.JsonUnwrapped;
import org.springframework.util.Assert;

/**
 * A simple {@link Resource} wrapping a domain object and adding links to it.
 * 
 * @author Oliver Gierke
 */
public class Resource<T> extends ResourceSupport {

	@JsonUnwrapped
	private final T content;

	/**
	 * Creates an empty {@link Resource}.
	 */
	protected Resource() {
		this.content = null;
	}

	/**
	 * Creates a new {@link Resource} with the given content.
	 * 
	 * @param content must not be {@literal null}.
	 */
	public Resource(T content) {

		Assert.notNull(content, "Content must not be null!");
		this.content = content;
	}

	/**
	 * Returns the underlying entity.
	 * 
	 * @return the content
	 */
	public T getContent() {
		return content;
	}
}