Java Doc for VariableSafeAbsRef.java in  » XML » xalan » org » apache » xpath » operations » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xalan » org.apache.xpath.operations   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.xpath.Expression       org.apache.xpath.operations.Variable          org.apache.xpath.operations.VariableSafeAbsRef VariableSafeAbsRef public class VariableSafeAbsRef extends Variable (Code) This is a "smart" variable reference that is used in situations where an absolute path is optimized into a variable reference, but may be used in some situations where the document context may have changed. For instance, in select="document(doc/@href)//name[//salary > 7250]", the root in the predicate will be different for each node in the set. While this is easy to detect statically in this case, in other cases static detection would be very hard or impossible. So, this class does a dynamic check to make sure the document context of the referenced variable is the same as the current document context, and, if it is not, execute the referenced variable's expression with the current context instead. Field Summary final static  long serialVersionUID      Method Summary public  XObject execute(XPathContext xctxt, boolean destructiveOK)      Dereference the variable, and return the reference value. Field Detail serialVersionUID final static long serialVersionUID(Code) Method Detail execute public XObject execute(XPathContext xctxt, boolean destructiveOK) throws javax.xml.transform.TransformerException(Code) Dereference the variable, and return the reference value. Note that lazy evaluation will occur. If a variable within scope is not found, a warning will be sent to the error listener, and an empty nodeset will be returned. Parameters:   xctxt - The runtime execution context. The evaluated variable, or an empty nodeset if not found. throws:   javax.xml.transform.TransformerException - Fields inherited from org.apache.xpath.operations.Variable final static java.lang.String PSUEDOVARNAMESPACE(Code)(Java Doc) protected int m_index(Code)(Java Doc) protected boolean m_isGlobal(Code)(Java Doc) protected QName m_qname(Code)(Java Doc) final static long serialVersionUID(Code)(Java Doc) Methods inherited from org.apache.xpath.operations.Variable public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)(Code)(Java Doc) public boolean deepEquals(Expression expr)(Code)(Java Doc) public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) public XObject execute(XPathContext xctxt, boolean destructiveOK) throws javax.xml.transform.TransformerException(Code)(Java Doc) public void fixupVariables(java.util.Vector vars, int globalsSize)(Code)(Java Doc) public int getAnalysisBits()(Code)(Java Doc) public org.apache.xalan.templates.ElemVariable getElemVariable()(Code)(Java Doc) public boolean getGlobal()(Code)(Java Doc) public int getIndex()(Code)(Java Doc) public QName getQName()(Code)(Java Doc) public boolean isPsuedoVarRef()(Code)(Java Doc) public boolean isStableNumber()(Code)(Java Doc) public void setIndex(int index)(Code)(Java Doc) public void setIsGlobal(boolean isGlobal)(Code)(Java Doc) public void setQName(QName qname)(Code)(Java Doc) Methods inherited from org.apache.xpath.Expression public DTMIterator asIterator(XPathContext xctxt, int contextNode) throws javax.xml.transform.TransformerException(Code)(Java Doc) public DTMIterator asIteratorRaw(XPathContext xctxt, int contextNode) throws javax.xml.transform.TransformerException(Code)(Java Doc) public int asNode(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) public void assertion(boolean b, java.lang.String msg)(Code)(Java Doc) public boolean bool(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) public boolean canTraverseOutsideSubtree()(Code)(Java Doc) abstract public boolean deepEquals(Expression expr)(Code)(Java Doc) public void error(XPathContext xctxt, String msg, Object[] args) throws javax.xml.transform.TransformerException(Code)(Java Doc) public XObject execute(XPathContext xctxt, int currentNode) throws javax.xml.transform.TransformerException(Code)(Java Doc) public XObject execute(XPathContext xctxt, int currentNode, DTM dtm, int expType) throws javax.xml.transform.TransformerException(Code)(Java Doc) abstract public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) public XObject execute(XPathContext xctxt, boolean destructiveOK) throws javax.xml.transform.TransformerException(Code)(Java Doc) public void executeCharsToContentHandler(XPathContext xctxt, ContentHandler handler) throws javax.xml.transform.TransformerException, org.xml.sax.SAXException(Code)(Java Doc) public void exprAddChild(ExpressionNode n, int i)(Code)(Java Doc) public ExpressionNode exprGetChild(int i)(Code)(Java Doc) public int exprGetNumChildren()(Code)(Java Doc) public ExpressionNode exprGetParent()(Code)(Java Doc) public void exprSetParent(ExpressionNode n)(Code)(Java Doc) abstract public void fixupVariables(java.util.Vector vars, int globalsSize)(Code)(Java Doc) public int getColumnNumber()(Code)(Java Doc) public ExpressionNode getExpressionOwner()(Code)(Java Doc) public int getLineNumber()(Code)(Java Doc) public String getPublicId()(Code)(Java Doc) public String getSystemId()(Code)(Java Doc) public boolean isNodesetExpr()(Code)(Java Doc) final protected boolean isSameClass(Expression expr)(Code)(Java Doc) public boolean isStableNumber()(Code)(Java Doc) public double num(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) public void warn(XPathContext xctxt, String msg, Object[] args) throws javax.xml.transform.TransformerException(Code)(Java Doc) public XMLString xstr(XPathContext xctxt) throws javax.xml.transform.TransformerException(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)