xalan/src/main/java/org/apache/xpath/WhitespaceStrippingElementMatcher.java

/*
 * 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.
 */
/*
 * $Id$
 */
package org.apache.xpath;

import javax.xml.transform.TransformerException;

import org.w3c.dom.Element;

/**
 * A class that implements this interface can tell if a given element should 
 * strip whitespace nodes from it's children.
 */
public interface WhitespaceStrippingElementMatcher
{
  /**
   * Get information about whether or not an element should strip whitespace.
   * @see <a href="http://www.w3.org/TR/xslt#strip">strip in XSLT Specification</a>
   *
   * @param support The XPath runtime state.
   * @param targetElement Element to check
   *
   * @return true if the whitespace should be stripped.
   *
   * @throws TransformerException if the question can't be answered (bad arguments, bad state).
   */
  public boolean shouldStripWhiteSpace(
          XPathContext support, Element targetElement) throws TransformerException;
  
  /**
   * Get information about whether or not whitespace can be stripped.
   * @see <a href="http://www.w3.org/TR/xslt#strip">strip in XSLT Specification</a>
   *
   * @return true if the whitespace can be stripped.
   */
  public boolean canStripWhiteSpace();
}