/*

   Copyright 2002, 2015  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 java.util.Set;
import org.w3c.dom.Element;

/**
 * This class provides an implementation of the
 * {@link org.w3c.css.sac.AttributeCondition} interface.
 */
public class CSSAttributeConditionImpl extends AbstractAttributeCondition {
	/**
	 * The attribute's local name.
	 */
	protected String localName;

	/**
	 * The attribute's namespace URI.
	 */
	protected String namespaceURI;

	/**
	 * Whether this condition applies to specified attributes.
	 */
	protected boolean specified;

	/**
	 * Creates a new CSSAttributeCondition object.
	 */
	public CSSAttributeConditionImpl(String localName, String namespaceURI,
			boolean specified, String value) {
		super(value);
		this.localName = localName;
		this.namespaceURI = namespaceURI;
		this.specified = specified;
	}

	/**
	 * 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 (!super.equals(obj)) {
			return false;
		}
		CSSAttributeConditionImpl c = (CSSAttributeConditionImpl) obj;
		return (c.namespaceURI.equals(namespaceURI)
				&& c.localName.equals(localName) && c.specified == specified);
	}

	/**
	 * equal objects should have equal hashCodes.
	 *
	 * @return hashCode of this CSSAttributeCondition
	 */
	@Override
	public int hashCode() {
		return namespaceURI.hashCode() ^ localName.hashCode()
				^ (specified ? -1 : 0);
	}

	/**
	 * <b>SAC</b>: Implements {@link
	 * org.w3c.css.sac.Condition#getConditionType()}.
	 */
	@Override
	public short getConditionType() {
		return SAC_ATTRIBUTE_CONDITION;
	}

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

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

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

	/**
	 * Tests whether this condition matches the given element.
	 */
	@Override
	public boolean match(Element e, String pseudoE) {
		if (!e.hasAttribute(getLocalName())) {
			return false;
		}
		String val = getValue();
		if (val == null) {
			return true;
		}
		return e.getAttribute(getLocalName()).equals(val);
	}

	/**
	 * Fills the given set with the attribute names found in this selector.
	 */
	@Override
	public void fillAttributeSet(Set<String> attrSet) {
		attrSet.add(localName);
	}

	/**
	 * Returns a text representation of this object.
	 */
	@Override
	public String toString() {
		if (value == null) {
			return '[' + localName + ']';
		}
		return '[' + localName + "=\"" + value + "\"]";
	}
}