- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xalan" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, Lotus
- * Development Corporation., http://www.lotus.com. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.xpath.functions;
-
- //import org.w3c.dom.Node;
-
- import java.util.Vector;
-
- import org.apache.xpath.XPathContext;
- import org.apache.xpath.XPath;
- import org.apache.xpath.objects.XObject;
- import org.apache.xpath.objects.XString;
- import org.apache.xalan.res.XSLMessages;
- import org.apache.xpath.res.XPATHErrorResources;
- import org.apache.xml.utils.XMLString;
-
- /**
- * <meta name="usage" content="advanced"/>
- * Execute the Substring() function.
- */
- public class FuncSubstring extends Function3Args
- {
-
- /**
- * 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
- {
-
- XMLString s1 = m_arg0.execute(xctxt).xstr();
- double start = m_arg1.execute(xctxt).num();
- int lenOfS1 = s1.length();
- XMLString substr;
-
- if (lenOfS1 <= 0)
- return XString.EMPTYSTRING;
- else
- {
- int startIndex;
-
- if (Double.isNaN(start))
- {
-
- // Double.MIN_VALUE doesn't work with math below
- // so just use a big number and hope I never get caught.
- start = -1000000;
- startIndex = 0;
- }
- else
- {
- start = Math.round(start);
- startIndex = (start > 0) ? (int) start - 1 : 0;
- }
-
- if (null != m_arg2)
- {
- double len = m_arg2.num(xctxt);
- int end = (int) (Math.round(len) + start) - 1;
-
- // Normalize end index.
- if (end < 0)
- end = 0;
- else if (end > lenOfS1)
- end = lenOfS1;
-
- if (startIndex > lenOfS1)
- startIndex = lenOfS1;
-
- substr = s1.substring(startIndex, end);
- }
- else
- {
- if (startIndex > lenOfS1)
- startIndex = lenOfS1;
- substr = s1.substring(startIndex);
- }
- }
-
- return (XString)substr; // cast semi-safe
- }
-
- /**
- * Check that the number of arguments passed to this function is correct.
- *
- *
- * @param argNum The number of arguments that is being passed to the function.
- *
- * @throws WrongNumberArgsException
- */
- public void checkNumberArgs(int argNum) throws WrongNumberArgsException
- {
- if (argNum < 2)
- reportWrongNumberArgs();
- }
-
- /**
- * Constructs and throws a WrongNumberArgException with the appropriate
- * message for this function object.
- *
- * @throws WrongNumberArgsException
- */
- protected void reportWrongNumberArgs() throws WrongNumberArgsException {
- throw new WrongNumberArgsException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_TWO_OR_THREE, null)); //"2 or 3");
- }
- }