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Guise™ Internet application framework.

There is a newer version: 0.5.3

/*
 * Copyright © 2005-2008 GlobalMentor, 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 io.guise.framework.component.layout;

import static java.util.Objects.*;

/**
 * Constraints on individual component layout. These constraints specify an identifier to which a component should be bound.
 * @author Garret Wilson
 */
public class ReferenceConstraints extends AbstractConstraints {

	/** The reference ID to which the component should be bound. */
	private final String id; //TODO maybe make this mutable

	/** @return The reference ID to which the component should be bound. */
	public String getID() {
		return id;
	}

	/**
	 * Creates constraints with a reference ID to which a component should be bound.
	 * @param id The ID to which the component should be bound.
	 * @throws NullPointerException if the given ID is null.
	 */
	public ReferenceConstraints(final String id) {
		this.id = requireNonNull(id, "ID cannot be null"); //save the ID
	}

}