- /*
- * 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;
- import org.apache.xpath.res.XPATHErrorResources;
- import org.apache.xalan.res.XSLMessages;
-
- /**
- * <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;
-
- /**
- * Return an expression array containing arguments at index 3 or greater.
- *
- * @return An array that contains the arguments at index 3 or greater.
- */
- public Expression[] getArgs()
- {
- return 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{}
-
- /**
- * Constructs and throws a WrongNumberArgException with the appropriate
- * message for this function object. This class supports an arbitrary
- * number of arguments, so this method must never be called.
- *
- * @throws WrongNumberArgsException
- */
- protected void reportWrongNumberArgs() throws WrongNumberArgsException {
- String fMsg = XSLMessages.createXPATHMessage(
- XPATHErrorResources.ER_INCORRECT_PROGRAMMER_ASSERTION,
- new Object[]{ "Programmer's assertion: the method FunctionMultiArgs.reportWrongNumberArgs() should never be called." });
-
- throw new RuntimeException(fMsg);
- }
-
- /**
- * 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;
- }
- }