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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.value 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.value.Value
      net.sf.saxon.value.Closure
         net.sf.saxon.value.MemoClosure

MemoClosure
public class MemoClosure extends Closure (Code)
A MemoClosure represents a value that has not yet been evaluated: the value is represented by an expression, together with saved values of all the context variables that the expression depends on.

The MemoClosure is designed for use when the value is only read several times. The value is saved on the first evaluation and remembered for later use.

The MemoClosure maintains a reservoir containing those items in the value that have already been read. When a new iterator is requested to read the value, this iterator first examines and returns any items already placed in the reservoir by previous users of the MemoClosure. When the reservoir is exhausted, it then uses an underlying Input Iterator to read further values of the underlying expression. If the value is not read to completion (for example, if the first user did exists($expr), then the Input Iterator is left positioned where this user abandoned it. The next user will read any values left in the reservoir by the first user, and then pick up iterating the base expression where the first user left off. Eventually, all the values of the expression will find their way into the reservoir, and future users simply iterate over the reservoir contents. Alternatively, of course, the values may be left unread.

Delayed evaluation is used only for expressions with a static type that allows more than one item, so the evaluateItem() method will not normally be used, but it is supported for completeness.

The expression may depend on local variables and on the context item; these values are held in the saved XPathContext object that is kept as part of the Closure, and they will always be read from that object. The expression may also depend on global variables; these are unchanging, so they can be read from the Bindery in the normal way. Expressions that depend on other contextual information, for example the values of position(), last(), current(), current-group(), should not be evaluated using this mechanism: they should always be evaluated eagerly. This means that the Closure does not need to keep a copy of these context variables.


Inner Class :final public class ProgressiveIterator implements SequenceIterator,LastPositionFinder,GroundedIterator

Field Summary
final protected static  intEMPTY
    
protected  intstate
    

Constructor Summary
public  MemoClosure()
     Constructor should not be called directly, instances should be made using the make() method.

Method Summary
public  intgetLength()
    
public  booleanisFullyRead()
    
public  ItemitemAt(int n)
     Get the n'th item in the sequence (starting from 0).
public  SequenceIteratoriterate(XPathContext context)
     Evaluate the expression in a given context to return an iterator over a sequence
Parameters:
  context - the evaluation context.
public  Valuematerialize()
    
public  voidprocess(XPathContext context)
    

Field Detail
EMPTY
final protected static int EMPTY(Code)



state
protected int state(Code)




Constructor Detail
MemoClosure
public MemoClosure()(Code)
Constructor should not be called directly, instances should be made using the make() method.




Method Detail
getLength
public int getLength() throws XPathException(Code)
Get the length of the sequence



isFullyRead
public boolean isFullyRead()(Code)
Determine whether the contents of the MemoClosure have been fully read



itemAt
public Item itemAt(int n) throws XPathException(Code)
Get the n'th item in the sequence (starting from 0). This is defined for all SequenceValues, but its real benefits come for a SequenceValue stored extensionally



iterate
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)
Evaluate the expression in a given context to return an iterator over a sequence
Parameters:
  context - the evaluation context. This is ignored; we use the context savedas part of the Closure instead.



materialize
public Value materialize() throws XPathException(Code)
Return a value containing all the items in the sequence returned by this SequenceIterator the corresponding value



process
public void process(XPathContext context) throws XPathException(Code)
Process the instruction, without returning any tail calls
Parameters:
  context - The dynamic context, giving access to the current node,the current variables, etc.



Fields inherited from net.sf.saxon.value.Closure
protected int depth(Code)(Java Doc)
protected Expression expression(Code)(Java Doc)
protected SequenceIterator inputIterator(Code)(Java Doc)
protected XPathContextMajor savedXPathContext(Code)(Java Doc)

Methods inherited from net.sf.saxon.value.Closure
public void display(int level, NamePool pool, PrintStream out)(Code)(Java Doc)
public int getCardinality()(Code)(Java Doc)
public int getImplementationMethod()(Code)(Java Doc)
public ItemType getItemType(TypeHierarchy th)(Code)(Java Doc)
public int getSpecialProperties()(Code)(Java Doc)
public boolean isIndexable()(Code)(Java Doc)
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)(Java Doc)
public static Value make(Expression expression, XPathContext context, int ref) throws XPathException(Code)(Java Doc)
public static Closure makeIteratorClosure(SequenceIterator iterator)(Code)(Java Doc)
public void process(XPathContext context) throws XPathException(Code)(Java Doc)
public Value reduce() throws XPathException(Code)(Java Doc)

Fields inherited from net.sf.saxon.value.Value
final public static Class[] EMPTY_CLASS_ARRAY(Code)(Java Doc)

Methods inherited from net.sf.saxon.value.Value
public static Item asItem(ValueRepresentation value, XPathContext context) throws XPathException(Code)(Java Doc)
public static SequenceIterator asIterator(ValueRepresentation val, XPathContext context) throws XPathException(Code)(Java Doc)
public static Value asValue(ValueRepresentation val)(Code)(Java Doc)
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException(Code)(Java Doc)
public static CharSequence collapseWhitespace(CharSequence in)(Code)(Java Doc)
public static Object convert(Item item) throws XPathException(Code)(Java Doc)
public static Value convertJavaObjectToXPath(Object object, SequenceType requiredType, Configuration config) throws XPathException(Code)(Java Doc)
public Object convertToJava(Class target, XPathContext context) throws XPathException(Code)(Java Doc)
public void display(int level, NamePool pool, PrintStream out)(Code)(Java Doc)
public boolean effectiveBooleanValue(XPathContext context) throws XPathException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
public String evaluateAsString(XPathContext context) throws XPathException(Code)(Java Doc)
public Item evaluateItem(XPathContext context) throws XPathException(Code)(Java Doc)
public int getCardinality()(Code)(Java Doc)
final public int getDependencies()(Code)(Java Doc)
public ItemType getItemType(TypeHierarchy th)(Code)(Java Doc)
public static SequenceIterator getIterator(ValueRepresentation val) throws XPathException(Code)(Java Doc)
public int getLength() throws XPathException(Code)(Java Doc)
final public Container getParentExpression()(Code)(Java Doc)
public int getSpecialProperties()(Code)(Java Doc)
public String getStringValue() throws XPathException(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
public Item itemAt(int n) throws XPathException(Code)(Java Doc)
final public Iterator iterateSubExpressions()(Code)(Java Doc)
public static QNameValue makeQNameValue(Object object, Configuration config)(Code)(Java Doc)
public static CharSequence normalizeWhitespace(CharSequence in)(Code)(Java Doc)
final public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType)(Code)(Java Doc)
public void process(XPathContext context) throws XPathException(Code)(Java Doc)
final public Expression promote(PromotionOffer offer)(Code)(Java Doc)
public Value reduce() throws XPathException(Code)(Java Doc)
public boolean schemaEquals(Value obj)(Code)(Java Doc)
final public Expression simplify(StaticContext env)(Code)(Java Doc)
public static double stringToNumber(CharSequence s) throws NumberFormatException(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public static CharSequence trimWhitespace(CharSequence in)(Code)(Java Doc)
final public Expression typeCheck(StaticContext env, ItemType contextItemType)(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)

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