| /* |
| * 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 java.util.Vector; |
| |
| import org.apache.xpath.Expression; |
| import org.apache.xpath.ExpressionOwner; |
| import org.apache.xpath.XPathVisitor; |
| import org.apache.xpath.functions.Function3Args.Arg2Owner; |
| |
| /** |
| * <meta name="usage" content="advanced"/> |
| * Base class for functions that accept an undetermined number of multiple |
| * arguments. |
| */ |
| public class FunctionMultiArgs extends Function3Args |
| { |
| |
| /** Argument expressions that are at index 3 or greater. |
| * @serial */ |
| Expression[] m_args; |
| |
| /** |
| * Set an argument expression for a function. This method is called by the |
| * XPath compiler. |
| * |
| * @param arg non-null expression that represents the argument. |
| * @param argNum The argument number index. |
| * |
| * @throws WrongNumberArgsException If a derived class determines that the |
| * number of arguments is incorrect. |
| */ |
| public void setArg(Expression arg, int argNum) |
| throws WrongNumberArgsException |
| { |
| |
| if (argNum < 3) |
| super.setArg(arg, argNum); |
| else |
| { |
| if (null == m_args) |
| { |
| m_args = new Expression[1]; |
| m_args[0] = arg; |
| } |
| else |
| { |
| |
| // Slow but space conservative. |
| Expression[] args = new Expression[m_args.length + 1]; |
| |
| System.arraycopy(m_args, 0, args, 0, m_args.length); |
| |
| args[m_args.length] = arg; |
| m_args = args; |
| } |
| arg.exprSetParent(this); |
| } |
| } |
| |
| /** |
| * This function is used to fixup variables from QNames to stack frame |
| * indexes at stylesheet build time. |
| * @param vars List of QNames that correspond to variables. This list |
| * should be searched backwards for the first qualified name that |
| * corresponds to the variable reference qname. The position of the |
| * QName in the vector from the start of the vector will be its position |
| * in the stack frame (but variables above the globalsTop value will need |
| * to be offset to the current stack frame). |
| */ |
| public void fixupVariables(java.util.Vector vars, int globalsSize) |
| { |
| super.fixupVariables(vars, globalsSize); |
| if(null != m_args) |
| { |
| for (int i = 0; i < m_args.length; i++) |
| { |
| m_args[i].fixupVariables(vars, globalsSize); |
| } |
| } |
| } |
| |
| /** |
| * 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{} |
| |
| /** |
| * 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() |
| { |
| |
| if (super.canTraverseOutsideSubtree()) |
| return true; |
| else |
| { |
| int n = m_args.length; |
| |
| for (int i = 0; i < n; i++) |
| { |
| if (m_args[i].canTraverseOutsideSubtree()) |
| return true; |
| } |
| |
| return false; |
| } |
| } |
| |
| class ArgMultiOwner implements ExpressionOwner |
| { |
| int m_argIndex; |
| |
| ArgMultiOwner(int index) |
| { |
| m_argIndex = index; |
| } |
| |
| /** |
| * @see ExpressionOwner#getExpression() |
| */ |
| public Expression getExpression() |
| { |
| return m_args[m_argIndex]; |
| } |
| |
| |
| /** |
| * @see ExpressionOwner#setExpression(Expression) |
| */ |
| public void setExpression(Expression exp) |
| { |
| exp.exprSetParent(FunctionMultiArgs.this); |
| m_args[m_argIndex] = exp; |
| } |
| } |
| |
| |
| /** |
| * @see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor) |
| */ |
| public void callArgVisitors(XPathVisitor visitor) |
| { |
| super.callArgVisitors(visitor); |
| if (null != m_args) |
| { |
| int n = m_args.length; |
| for (int i = 0; i < n; i++) |
| { |
| m_args[i].callVisitors(new ArgMultiOwner(i), visitor); |
| } |
| } |
| } |
| |
| /** |
| * @see Expression#deepEquals(Expression) |
| */ |
| public boolean deepEquals(Expression expr) |
| { |
| if (!super.deepEquals(expr)) |
| return false; |
| |
| FunctionMultiArgs fma = (FunctionMultiArgs) expr; |
| if (null != m_args) |
| { |
| int n = m_args.length; |
| if ((null == fma) || (fma.m_args.length != n)) |
| return false; |
| |
| for (int i = 0; i < n; i++) |
| { |
| if (!m_args[i].deepEquals(fma.m_args[i])) |
| return false; |
| } |
| |
| } |
| else if (null != fma.m_args) |
| { |
| return false; |
| } |
| |
| return true; |
| } |
| } |