net.sf.saxon.style
Class XSLIf

java.lang.Object
  extended by net.sf.saxon.tree.NodeImpl
      extended by net.sf.saxon.tree.ElementImpl
          extended by net.sf.saxon.tree.ElementWithAttributes
              extended by net.sf.saxon.style.StyleElement
                  extended by net.sf.saxon.style.XSLIf
All Implemented Interfaces:
Serializable, Source, SourceLocator, LocationProvider, SaxonLocator, PullEvent, Container, FingerprintedNode, Item, NamespaceResolver, NodeInfo, ValueRepresentation, InstructionInfo, Locator

public class XSLIf
extends StyleElement

Handler for xsl:if elements in stylesheet.
The xsl:if element has a mandatory attribute test, a boolean expression. The content is output if the test condition is true.

See Also:
Serialized Form

Field Summary
 
Fields inherited from class net.sf.saxon.style.StyleElement
REPORT_ALWAYS, REPORT_IF_INSTANTIATED, REPORT_UNLESS_FALLBACK_AVAILABLE, REPORT_UNLESS_FORWARDS_COMPATIBLE
 
Fields inherited from class net.sf.saxon.tree.NodeImpl
NODE_LETTER
 
Fields inherited from interface net.sf.saxon.om.NodeInfo
ALL_NAMESPACES, EMPTY_NAMESPACE_LIST, IS_DTD_TYPE, IS_NILLED, LOCAL_NAMESPACES, NO_NAMESPACES
 
Fields inherited from interface net.sf.saxon.om.ValueRepresentation
EMPTY_VALUE_ARRAY
 
Constructor Summary
XSLIf()
           
 
Method Summary
 void addChild(NodeImpl node, int index)
          Add a child node to this node.
 void compact(int size)
          Compact the space used by this node
 Expression compile(Executable exec)
          Compile the instruction on the stylesheet tree into an executable instruction for use at run-time.
 NodeInfo getFirstChild()
          Get the first child node of the element
 NodeInfo getLastChild()
          Get the last child node of the element
 String getStringValue()
          Return the string-value of the node, that is, the concatenation of the character content of all descendent elements and text nodes.
 CharSequence getStringValueCS()
          Get the value of the item as a CharSequence.
 boolean hasChildNodes()
          Determine if the node has any children.
 boolean isInstruction()
          Determine whether this node is an instruction.
 void markTailCalls()
          Mark tail-recursive calls on stylesheet functions.
 boolean mayContainSequenceConstructor()
          Determine whether this type of element is allowed to contain a template-body
 void prepareAttributes()
          Set the attribute list for the element.
 void validate()
          Check that the stylesheet element is valid.
 
Methods inherited from class net.sf.saxon.style.StyleElement
allocatePatternSlots, allocateSlots, allocateSlots, backwardsCompatibleModeIsEnabled, bindVariable, checkEmpty, checkTopLevel, checkWithinTemplate, compileSequenceConstructor, fixupReferences, forwardsCompatibleModeIsEnabled, getAllStylesheetFunctions, getAttributeValue, getConstructType, getContainingSlotManager, getContainingStylesheet, getExecutable, getHostLanguage, getLineNumber, getLineNumber, getLocationProvider, getNamespaceResolver, getObjectName, getObjectName, getPrecedence, getPreparedStylesheet, getPrincipalStylesheet, getProperties, getProperty, getSchemaType, getStaticContext, getStylesheetFunction, getSystemId, getTypeAnnotation, getVersion, isExcludedNamespace, isExtensionNamespace, isTopLevel, makeExpression, makeExpressionVisitor, makeNamespaceContext, makePattern, makeQName, makeSequenceType, postValidate, replaceSubExpression, reportAbsence, setLineNumber, setObjectName, substituteFor, typeCheck, typeCheck, validateSubtree
 
Methods inherited from class net.sf.saxon.tree.ElementWithAttributes
copy, getAttributeList, getAttributeValue, getDeclaredNamespaces, getInScopeNamespaceCodes, getPrefixForURI, getURICodeForPrefix, getURIForPrefix, initialise, iteratePrefixes, setNamespaceDeclarations
 
Methods inherited from class net.sf.saxon.tree.ElementImpl
generateId, getBaseURI, getDocumentRoot, getNameCode, getNodeKind, getRoot, getSystemId, setNameCode, setSystemId
 
Methods inherited from class net.sf.saxon.tree.NodeImpl
atomize, compareOrder, equals, getColumnNumber, getConfiguration, getDisplayName, getDocumentNumber, getFingerprint, getLocalPart, getNamePool, getNextInDocument, getNextSibling, getParent, getPrefix, getPreviousInDocument, getPreviousSibling, getPublicId, getTypeAnnotation, getTypedValue, getURI, hashCode, isSameNodeInfo, iterateAxis, iterateAxis
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface net.sf.saxon.trace.InstructionInfo
getSystemId
 

Constructor Detail

XSLIf

public XSLIf()
Method Detail

isInstruction

public boolean isInstruction()
Determine whether this node is an instruction.

Overrides:
isInstruction in class StyleElement
Returns:
true - it is an instruction

mayContainSequenceConstructor

public boolean mayContainSequenceConstructor()
Determine whether this type of element is allowed to contain a template-body

Returns:
true: yes, it may contain a template-body

prepareAttributes

public void prepareAttributes()
                       throws XPathException
Description copied from class: StyleElement
Set the attribute list for the element. This is called to process the attributes (note the distinction from processAttributes in the superclass). Must be supplied in a subclass

Throws:
XPathException

validate

public void validate()
              throws XPathException
Description copied from class: StyleElement
Check that the stylesheet element is valid. This is called once for each element, after the entire tree has been built. As well as validation, it can perform first-time initialisation. The default implementation does nothing; it is normally overriden in subclasses.

Overrides:
validate in class StyleElement
Throws:
XPathException

markTailCalls

public void markTailCalls()
Mark tail-recursive calls on stylesheet functions. For most instructions, this does nothing.


compile

public Expression compile(Executable exec)
                   throws XPathException
Description copied from class: StyleElement
Compile the instruction on the stylesheet tree into an executable instruction for use at run-time.

Specified by:
compile in class StyleElement
Parameters:
exec - the Executable
Returns:
either a ComputedExpression, or null. The value null is returned when compiling an instruction that returns a no-op, or when compiling a top-level object such as an xsl:template that compiles into something other than an instruction.
Throws:
XPathException

hasChildNodes

public final boolean hasChildNodes()
Determine if the node has any children.

Specified by:
hasChildNodes in interface NodeInfo
Overrides:
hasChildNodes in class NodeImpl
Returns:
true if the node has any children, false if the node has no children.

getFirstChild

public final NodeInfo getFirstChild()
Get the first child node of the element

Overrides:
getFirstChild in class NodeImpl
Returns:
the first child node of the required type, or null if there are no children

getLastChild

public final NodeInfo getLastChild()
Get the last child node of the element

Overrides:
getLastChild in class NodeImpl
Returns:
the last child of the element, or null if there are no children

getStringValue

public String getStringValue()
Return the string-value of the node, that is, the concatenation of the character content of all descendent elements and text nodes.

Returns:
the accumulated character content of the element, including descendant elements.
See Also:
Item.getStringValueCS()

getStringValueCS

public CharSequence getStringValueCS()
Description copied from class: NodeImpl
Get the value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String.

Specified by:
getStringValueCS in interface Item
Specified by:
getStringValueCS in interface ValueRepresentation
Overrides:
getStringValueCS in class NodeImpl
Returns:
the string value of the item
See Also:
Item.getStringValue()

addChild

public void addChild(NodeImpl node,
                     int index)
Add a child node to this node. For system use only. Note: normalizing adjacent text nodes is the responsibility of the caller.

Parameters:
node - the node to be added as a child of this node
index - the position where the child is to be added

compact

public void compact(int size)
Compact the space used by this node

Parameters:
size - the number of actual children


Copyright (C) Michael H. Kay. All rights reserved.