jaxp/src/java.xml/share/classes/com/sun/org/apache/xpath/internal/functions/FuncContains.java

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/*
 * 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,
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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;
  }
}