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/*
 * Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
 * Copyright 2004 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.
 */

package org.apache.taglibs.standard.tei;

import javax.servlet.jsp.tagext.TagData;
import javax.servlet.jsp.tagext.TagExtraInfo;

/**
 * An implementation of TagExtraInfo that implements validation for
 * <x:transform>'s attributes
 *
 * @author Shawn Bayern
 */
public class XmlTransformTEI extends TagExtraInfo {

    final private static String XSLT = "xslt";
    final private static String RESULT = "result";
    final private static String VAR = "var";

    public boolean isValid(TagData us) {
	// require XSLT
	if (!Util.isSpecified(us, XSLT))
	    return false;

	// disallow both VAR and RESULT
	if (Util.isSpecified(us, VAR) && Util.isSpecified(us, RESULT))
	    return false;
        return true;
    }

}