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: Class NodeSetIntent

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com.icl.saxon.expr
Class NodeSetIntent


java.lang.Object

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

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        +--com.icl.saxon.expr.Value

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              +--com.icl.saxon.expr.NodeSetValue

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                    +--com.icl.saxon.expr.NodeSetIntent

public class NodeSetIntent
extends NodeSetValue

A node-set value implemented intensionally. It is a wrapper round an Expression which can be evaluated independently of context, that is it has been reduced so there are no remaining context-dependencies.

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

ANY, BOOLEAN, NODESET, NUMBER, OBJECT, STRING

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

staticContext

Constructor Summary

NodeSetIntent(NodeSetExpression exp, Controller controller)
          Construct a node-set containing all the nodes in a NodeEnumeration

Method Summary

boolean asBoolean()
          Evaluate as a boolean.

java.lang.String asString()
          Convert to string value

NodeEnumeration enumerate()
          Return an enumeration of this nodeset value.

int getCount()
          Count the nodes in the node-set.

NodeInfo getFirst()
          Get the first node in the nodeset (in document order)

NodeSetExpression getNodeSetExpression()
          Get the encapsulated NodeSetExpression

boolean isContextDocumentNodeSet()
          Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node.

boolean isSorted()
          Test whether the value is known to be sorted

NodeInfo selectFirst(Context context)
          Return the first node in the nodeset (in document order)

void setSorted(boolean isSorted)
          Set a flag to indicate whether the nodes are sorted.

NodeSetValue sort()
          Sort the nodes into document order.

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

asNumber, compare, conversionPreference, convertToJava, display, enumerate, equals, evaluate, evaluateAsNodeSet, getDataType, notEquals

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

getDependencies, inverse, numericCompare, reduce, simplify, stringToNumber

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

containsReferences, evaluateAsBoolean, evaluateAsNumber, evaluateAsString, getStaticContext, indent, make, outputStringValue, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Constructor Detail

NodeSetIntent


public NodeSetIntent(NodeSetExpression exp,
                     Controller controller)
              throws XPathException

Construct a node-set containing all the nodes in a NodeEnumeration

Method Detail

getNodeSetExpression


public NodeSetExpression getNodeSetExpression()

Get the encapsulated NodeSetExpression

setSorted


public void setSorted(boolean isSorted)

Set a flag to indicate whether the nodes are sorted. Used when the creator of the node-set knows that they are already in document order.

Overrides:: setSorted in class NodeSetValue

Parameters:: isSorted - true if the caller wishes to assert that the nodes will be delivered in document order and do not need to be further sorted

isSorted


public boolean isSorted()
                 throws XPathException

Test whether the value is known to be sorted

Overrides:: isSorted in class NodeSetValue

Returns:: true if the value is known to be sorted in document order, false if it is not known whether it is sorted.

isContextDocumentNodeSet


public boolean isContextDocumentNodeSet()

Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node. Used for optimization.

Overrides:: isContextDocumentNodeSet in class Expression

asString


public java.lang.String asString()
                          throws XPathException

Convert to string value

Overrides:: asString in class NodeSetValue

Returns:: the value of the first node in the node-set if there is one, otherwise an empty string

asBoolean


public boolean asBoolean()
                  throws XPathException

Evaluate as a boolean.

Overrides:: asBoolean in class NodeSetValue

Returns:: true if the node set is not empty

getCount


public int getCount()
             throws XPathException

Count the nodes in the node-set. Note this will sort the node set if necessary, to make sure there are no duplicates.

Overrides:: getCount in class NodeSetValue

sort


public NodeSetValue sort()
                  throws XPathException

Sort the nodes into document order. This does nothing if the nodes are already known to be sorted; to force a sort, call setSorted(false)

Overrides:: sort in class NodeSetValue

Returns:: the same NodeSetValue, after sorting.

getFirst


public NodeInfo getFirst()
                  throws XPathException

Get the first node in the nodeset (in document order)

Overrides:: getFirst in class NodeSetValue

Returns:: the first node

selectFirst


public NodeInfo selectFirst(Context context)
                     throws XPathException

Return the first node in the nodeset (in document order)

Parameters:: context - The context for the evaluation: not used
Returns:: the NodeInfo of the first node in document order, or null if the node-set is empty.

enumerate


public NodeEnumeration enumerate()
                          throws XPathException

Return an enumeration of this nodeset value.

Overrides:: enumerate in class NodeSetValue