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: Class ParentNodeExpression

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com.icl.saxon.expr
Class ParentNodeExpression


java.lang.Object

  |

  +--com.icl.saxon.expr.Expression

        |

        +--com.icl.saxon.expr.NodeSetExpression

              |

              +--com.icl.saxon.expr.SingletonExpression

                    |

                    +--com.icl.saxon.expr.ParentNodeExpression

public class ParentNodeExpression
extends SingletonExpression

Class ParentNodeExpression represents the XPath expression ".." or "parent::node()"

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

Constructor Summary

ParentNodeExpression()


Method Summary

void display(int level)
          Diagnostic print of expression structure

boolean evaluateAsBoolean(Context context)
          Evaluate as a boolean.

java.lang.String evaluateAsString(Context context)
          Evaluate as a string.

int getDependencies()
          Determine which aspects of the context the expression depends on.

NodeInfo getNode(Context context)
          Return the node selected by this SingletonExpression

Expression reduce(int dependencies, Context context)
          Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Methods inherited from class com.icl.saxon.expr.SingletonExpression

enumerate, evaluateAsNodeSet, isContextDocumentNodeSet, selectFirst

Methods inherited from class com.icl.saxon.expr.NodeSetExpression

evaluate, getDataType, outputStringValue

Methods inherited from class com.icl.saxon.expr.Expression

containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, simplify, usesCurrent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParentNodeExpression


public ParentNodeExpression()

Method Detail

getNode


public NodeInfo getNode(Context context)
                 throws XPathException

Return the node selected by this SingletonExpression

Overrides:: getNode in class SingletonExpression

Parameters:: context - The context for the evaluation
Returns:: the parent of the current node defined by the context

getDependencies


public int getDependencies()

Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as Context.VARIABLES and Context.CURRENT_NODE

Overrides:: getDependencies in class Expression

evaluateAsString


public java.lang.String evaluateAsString(Context context)
                                  throws XPathException

Evaluate as a string. Returns the string value of the parent node

Overrides:: evaluateAsString in class SingletonExpression

Parameters:: context - The context in which the expression is to be evaluated
Returns:: the value of the current node, identified by the context

evaluateAsBoolean


public boolean evaluateAsBoolean(Context context)
                          throws XPathException

Evaluate as a boolean. Returns true if there are any nodes selected by the NodeSetExpression.

Overrides:: evaluateAsBoolean in class SingletonExpression

Parameters:: context - The context in which the expression is to be evaluated
Returns:: true unless the current node is the Document node

reduce


public Expression reduce(int dependencies,
                         Context context)
                  throws XPathException

Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.

Overrides:: reduce in class Expression

Parameters:: dependencies - The dependencies to be removed; context - The context to be used for the partial evaluation
Returns:: a new expression that does not have any of the specified dependencies

display


public void display(int level)

Diagnostic print of expression structure

Overrides:: display in class Expression