| /* |
| * 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. |
| */ |
| /* |
| * $Id: FunctionDef1Arg.java 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xpath.functions; |
| |
| import org.apache.xalan.res.XSLMessages; |
| import org.apache.xml.dtm.DTM; |
| import org.apache.xml.utils.XMLString; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XString; |
| import org.apache.xpath.res.XPATHErrorResources; |
| |
| /** |
| * Base class for functions that accept one argument that can be defaulted if |
| * not specified. |
| * @xsl.usage advanced |
| */ |
| public class FunctionDef1Arg extends FunctionOneArg |
| { |
| static final long serialVersionUID = 2325189412814149264L; |
| |
| /** |
| * Execute the first argument expression that is expected to return a |
| * nodeset. If the argument is null, then return the current context node. |
| * |
| * @param xctxt Runtime XPath context. |
| * |
| * @return The first node of the executed nodeset, or the current context |
| * node if the first argument is null. |
| * |
| * @throws javax.xml.transform.TransformerException if an error occurs while |
| * executing the argument expression. |
| */ |
| protected int getArg0AsNode(XPathContext xctxt) |
| throws javax.xml.transform.TransformerException |
| { |
| |
| return (null == m_arg0) |
| ? xctxt.getCurrentNode() : m_arg0.asNode(xctxt); |
| } |
| |
| /** |
| * Tell if the expression is a nodeset expression. |
| * @return true if the expression can be represented as a nodeset. |
| */ |
| public boolean Arg0IsNodesetExpr() |
| { |
| return (null == m_arg0) ? true : m_arg0.isNodesetExpr(); |
| } |
| |
| /** |
| * Execute the first argument expression that is expected to return a |
| * string. If the argument is null, then get the string value from the |
| * current context node. |
| * |
| * @param xctxt Runtime XPath context. |
| * |
| * @return The string value of the first argument, or the string value of the |
| * current context node if the first argument is null. |
| * |
| * @throws javax.xml.transform.TransformerException if an error occurs while |
| * executing the argument expression. |
| */ |
| protected XMLString getArg0AsString(XPathContext xctxt) |
| throws javax.xml.transform.TransformerException |
| { |
| if(null == m_arg0) |
| { |
| int currentNode = xctxt.getCurrentNode(); |
| if(DTM.NULL == currentNode) |
| return XString.EMPTYSTRING; |
| else |
| { |
| DTM dtm = xctxt.getDTM(currentNode); |
| return dtm.getStringValue(currentNode); |
| } |
| |
| } |
| else |
| return m_arg0.execute(xctxt).xstr(); |
| } |
| |
| /** |
| * Execute the first argument expression that is expected to return a |
| * number. If the argument is null, then get the number value from the |
| * current context node. |
| * |
| * @param xctxt Runtime XPath context. |
| * |
| * @return The number value of the first argument, or the number value of the |
| * current context node if the first argument is null. |
| * |
| * @throws javax.xml.transform.TransformerException if an error occurs while |
| * executing the argument expression. |
| */ |
| protected double getArg0AsNumber(XPathContext xctxt) |
| throws javax.xml.transform.TransformerException |
| { |
| |
| if(null == m_arg0) |
| { |
| int currentNode = xctxt.getCurrentNode(); |
| if(DTM.NULL == currentNode) |
| return 0; |
| else |
| { |
| DTM dtm = xctxt.getDTM(currentNode); |
| XMLString str = dtm.getStringValue(currentNode); |
| return str.toDouble(); |
| } |
| |
| } |
| else |
| return m_arg0.execute(xctxt).num(); |
| } |
| |
| /** |
| * 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 if the number of arguments is not 0 or 1. |
| */ |
| public void checkNumberArgs(int argNum) throws WrongNumberArgsException |
| { |
| if (argNum > 1) |
| 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_ZERO_OR_ONE, null)); //"0 or 1"); |
| } |
| |
| /** |
| * Tell if this expression or it's subexpressions can traverse outside |
| * the current subtree. |
| * |
| * @return true if traversal outside the context node's subtree can occur. |
| */ |
| public boolean canTraverseOutsideSubtree() |
| { |
| return (null == m_arg0) ? false : super.canTraverseOutsideSubtree(); |
| } |
| } |