| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999-2003 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"); |
| } |
| } |