- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 2002 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.xalan.templates;
-
- import org.apache.xpath.ExpressionOwner;
- import org.apache.xpath.XPathVisitor;
- import org.apache.xpath.axes.LocPathIterator;
- import org.apache.xpath.functions.FuncCurrent;
- import org.apache.xpath.functions.FuncExtFunction;
- import org.apache.xpath.functions.Function;
- import org.apache.xpath.operations.Variable;
-
- /**
- * This class runs over a path expression that is assumed to be absolute, and
- * checks for variables and the like that may make it context dependent.
- */
- public class AbsPathChecker extends XPathVisitor
- {
- private boolean m_isAbs = true;
-
- /**
- * Process the LocPathIterator to see if it contains variables
- * or functions that may make it context dependent.
- * @param path LocPathIterator that is assumed to be absolute, but needs checking.
- * @return true if the path is confirmed to be absolute, false if it
- * may contain context dependencies.
- */
- public boolean checkAbsolute(LocPathIterator path)
- {
- m_isAbs = true;
- path.callVisitors(null, this);
- return m_isAbs;
- }
-
- /**
- * Visit a function.
- * @param owner The owner of the expression, to which the expression can
- * be reset if rewriting takes place.
- * @param func The function reference object.
- * @return true if the sub expressions should be traversed.
- */
- public boolean visitFunction(ExpressionOwner owner, Function func)
- {
- if((func instanceof FuncCurrent) ||
- (func instanceof FuncExtFunction))
- m_isAbs = false;
- return true;
- }
-
- /**
- * Visit a variable reference.
- * @param owner The owner of the expression, to which the expression can
- * be reset if rewriting takes place.
- * @param var The variable reference object.
- * @return true if the sub expressions should be traversed.
- */
- public boolean visitVariableRef(ExpressionOwner owner, Variable var)
- {
- m_isAbs = false;
- return true;
- }
- }
-