/*

   Copyright 2002, 2014  The Apache Software Foundation

   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.

 */

/* This class copied from org.apache.batik.css.engine.sac */

package org.eclipse.e4.ui.css.core.impl.sac;

import org.w3c.css.sac.AttributeCondition;

/**
 * This class provides an abstract implementation of the {@link
 * org.w3c.css.sac.AttributeCondition} interface.
 */
public abstract class AbstractAttributeCondition implements AttributeCondition,
		ExtendedCondition {

	/**
	 * The attribute value.
	 */
	protected String value;

	/**
	 * Creates a new AbstractAttributeCondition object.
	 */
	protected AbstractAttributeCondition(String value) {
		this.value = value;
	}

	/**
	 * Indicates whether some other object is "equal to" this one.
	 *
	 * @param obj
	 *            the reference object with which to compare.
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj == null || (obj.getClass() != getClass())) {
			return false;
		}
		AbstractAttributeCondition c = (AbstractAttributeCondition) obj;
		return c.value.equals(value);
	}

	/**
	 * equal objects should have equal hashCodes.
	 *
	 * @return hashCode of this AbstractAttributeCondition
	 */
	@Override
	public int hashCode() {
		return value == null ? -1 : value.hashCode();
	}

	/**
	 * Returns the specificity of this condition.
	 */
	@Override
	public int getSpecificity() {
		return 1 << 8;
	}

	/**
	 * <b>SAC</b>: Implements {@link
	 * org.w3c.css.sac.AttributeCondition#getValue()}.
	 */
	@Override
	public String getValue() {
		return value;
	}
}