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127 lines
3.6 KiB
127 lines
3.6 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: FuncSubstring.java,v 1.2.4.1 2005/09/14 20:18:45 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.functions;
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import com.sun.org.apache.xalan.internal.res.XSLMessages;
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import com.sun.org.apache.xml.internal.utils.XMLString;
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import com.sun.org.apache.xpath.internal.XPathContext;
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import com.sun.org.apache.xpath.internal.objects.XObject;
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import com.sun.org.apache.xpath.internal.objects.XString;
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import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;
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/**
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* Execute the Substring() function.
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* @xsl.usage advanced
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*/
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public class FuncSubstring extends Function3Args
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{
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static final long serialVersionUID = -5996676095024715502L;
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/**
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* Execute the function. The function must return
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* a valid object.
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* @param xctxt The current execution context.
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* @return A valid XObject.
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*
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* @throws javax.xml.transform.TransformerException
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*/
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public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
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{
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XMLString s1 = m_arg0.execute(xctxt).xstr();
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double start = m_arg1.execute(xctxt).num();
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int lenOfS1 = s1.length();
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XMLString substr;
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if (lenOfS1 <= 0)
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return XString.EMPTYSTRING;
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else
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{
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int startIndex;
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if (Double.isNaN(start))
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{
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// Double.MIN_VALUE doesn't work with math below
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// so just use a big number and hope I never get caught.
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start = -1000000;
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startIndex = 0;
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}
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else
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{
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start = Math.round(start);
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startIndex = (start > 0) ? (int) start - 1 : 0;
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}
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if (null != m_arg2)
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{
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double len = m_arg2.num(xctxt);
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int end = (int) (Math.round(len) + start) - 1;
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// Normalize end index.
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if (end < 0)
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end = 0;
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else if (end > lenOfS1)
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end = lenOfS1;
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if (startIndex > lenOfS1)
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startIndex = lenOfS1;
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substr = s1.substring(startIndex, end);
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}
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else
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{
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if (startIndex > lenOfS1)
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startIndex = lenOfS1;
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substr = s1.substring(startIndex);
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}
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}
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return (XString)substr; // cast semi-safe
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}
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/**
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* Check that the number of arguments passed to this function is correct.
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*
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*
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* @param argNum The number of arguments that is being passed to the function.
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*
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* @throws WrongNumberArgsException
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*/
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public void checkNumberArgs(int argNum) throws WrongNumberArgsException
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{
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if (argNum < 2)
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reportWrongNumberArgs();
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}
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/**
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* Constructs and throws a WrongNumberArgException with the appropriate
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* message for this function object.
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*
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* @throws WrongNumberArgsException
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*/
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protected void reportWrongNumberArgs() throws WrongNumberArgsException {
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throw new WrongNumberArgsException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_TWO_OR_THREE, null)); //"2 or 3");
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}
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}
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