/*
 * 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.wicket.extensions.markup.html.repeater.util;

import org.apache.wicket.util.io.IClusterable;
import org.apache.wicket.util.lang.Args;

/**
 * Represents sorting information of a property
 * 
 * @author Igor Vaynberg ( ivaynberg )
 * @param <T>
 *            the type of the sort property
 */
public class SortParam<T> implements IClusterable
{
	private static final long serialVersionUID = 1L;

	private final T property;
	private final boolean ascending;

	/**
	 * @param property
	 *            sort property
	 * @param ascending
	 *            <code>true<code> if sort order is ascending, <code>false</code> if sort order is
	 *            descending
	 */
	public SortParam(final T property, final boolean ascending)
	{
		Args.notNull(property, "property");
		this.property = property;
		this.ascending = ascending;
	}

	/**
	 * @return sort property
	 */
	public T getProperty()
	{
		return property;
	}

	/**
	 * check if sort order is ascending
	 * 
	 * @return <code>true<code> if sort order is ascending, <code>false</code> if sort order is
	 *         descending
	 */
	public boolean isAscending()
	{
		return ascending;
	}

	@Override
	public boolean equals(final Object o)
	{
		if (this == o)
		{
			return true;
		}
		if (!(o instanceof SortParam))
		{
			return false;
		}

		@SuppressWarnings("unchecked")
		SortParam<T> sortParam = (SortParam<T>)o;

		return (ascending == sortParam.ascending) && property.equals(sortParam.property);
	}

	@Override
	public int hashCode()
	{
		int result = property.hashCode();
		result = 31 * result + (ascending ? 1 : 0);
		return result;
	}

	/**
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString()
	{
		return new StringBuilder().append("[SortParam property=")
			.append(getProperty())
			.append(" ascending=")
			.append(ascending)
			.append("]")
			.toString();
	}
}