/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * 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.

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package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xpath.internal.XPathContext;

import com.sun.org.apache.xpath.internal.objects.XBoolean;

import com.sun.org.apache.xpath.internal.objects.XObject;

/**

 * Execute the Contains() function.

 * @xsl.usage advanced

 */

public class FuncContains extends Function2Args

{

    static final long serialVersionUID = 5084753781887919723L;

  /**

   * Execute the function.  The function must return

   * a valid object.

   * @param xctxt The current execution context.

   * @return A valid XObject.

   *

   * @throws javax.xml.transform.TransformerException

   */

  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException

  {

    String s1 = m_arg0.execute(xctxt).str();

    String s2 = m_arg1.execute(xctxt).str();

    // Add this check for JDK consistency for empty strings.

    if (s1.length() == 0 && s2.length() == 0)

      return XBoolean.S_TRUE;

    int index = s1.indexOf(s2);

    return (index > -1) ? XBoolean.S_TRUE : XBoolean.S_FALSE;

  }

}