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


java.lang.Object
   net.sf.saxon.expr.PromotionOffer

PromotionOffer
public class PromotionOffer (Code)
PromotionOffer is an object used transiently during compilation of an expression. It contains information passed by a containing expression to its subexpressions, when looking for subexpressions that can be promoted to a higher level because they are not dependent on the context established by the containing expression. The object is also used to pass back return information when the promotion actually takes place.


Field Summary
final public static  intFOCUS_INDEPENDENT
     FOCUS_INDEPENDENT requests promotion of all non-trivial subexpressions that don't depend on the focus.
final public static  intINLINE_VARIABLE_REFERENCES
     Inline variable references causes all references to a variable V to be replaced by the expression E.
final public static  intRANGE_INDEPENDENT
     RANGE_INDEPENDENT requests promotion of all non-trivial subexpressions that don't depend on a specified range variable.
final public static  intREPLACE_CURRENT
     REPLACE_CURRENT causes calls to the XSLT current() function to be replaced by reference to a variable.
final public static  intUNORDERED
     UNORDERED indicates that the containing expression does not require the results to be delivered in any particular order.
public  booleanaccepted
    
public  intaction
    
public  Binding[]bindingList
     In the case of RANGE_INDEPENDENT and WHERE_CLAUSE, "binding" identifies the range variables whose dependencies we are looking for.
public  ExpressioncontainingExpression
     When a promotion offer is made, containingExpression identifies the level to which the promotion should occur.
public  booleanmustEliminateDuplicates
     In the case of UNORDERED, "mustEliminateDuplicates" is a boolean that is set to true if the nodes can be delivered in any order so long as there are no duplicates (for example, as required by the count() function).
public  booleanpromoteDocumentDependent
     In the case of FOCUS_INDEPENDENT, "promoteDocumentDependent" is a boolean that, when set to true, indicates that it is safe to promote a subexpression that depends on the context document but not on other aspects of the focus.
public  booleanpromoteXSLTFunctions
     In the case of FOCUS_INDEPENDENT, "promoteXSLTFunctions" is a boolean that, when set to true, indicates that it is safe to promote XSLT functions such as current().

Constructor Summary
public  PromotionOffer(Optimizer optimizer)
    

Method Summary
public  Expressionaccept(Expression child)
     Method to test whether a subexpression qualifies for promotion, and if so, to accept the promotion. if promotion was done, returns the expression that should be used in placeof the child expression.
public  OptimizergetOptimizer()
    

Field Detail
FOCUS_INDEPENDENT
final public static int FOCUS_INDEPENDENT(Code)
FOCUS_INDEPENDENT requests promotion of all non-trivial subexpressions that don't depend on the focus. This is typically used to extract subexpressions from a filter predicate. The offer is optional - each subexpression can decide whether it's worth the trouble of promoting itself. The offer is normally passed on to subexpressions, except subexpressions that are evaluated with a different focus



INLINE_VARIABLE_REFERENCES
final public static int INLINE_VARIABLE_REFERENCES(Code)
Inline variable references causes all references to a variable V to be replaced by the expression E. The variable is supplied in the "binding" property; the replacement expression in the containingExpression property. A special case is where the replacement expression is a ContextItemExpression; in this case the offer is not passed on to subexpressions where the context is different.



RANGE_INDEPENDENT
final public static int RANGE_INDEPENDENT(Code)
RANGE_INDEPENDENT requests promotion of all non-trivial subexpressions that don't depend on a specified range variable. This is typically used to extract subexpressions from the action of a for expression or the condition of a some/every quantified expression. The offer is optional - each subexpression can decide whether it's worth the trouble of promoting itself. The offer is normally passed on to subexpressions, except subexpressions that are evaluated with a different focus or a different range variable, because these may have other dependencies that prevent their promotion.



REPLACE_CURRENT
final public static int REPLACE_CURRENT(Code)
REPLACE_CURRENT causes calls to the XSLT current() function to be replaced by reference to a variable. The variable binding is the single member of the array bindingList



UNORDERED
final public static int UNORDERED(Code)
UNORDERED indicates that the containing expression does not require the results to be delivered in any particular order. The boolean mustEliminateDuplicates is set if duplicate items in the result are not allowed.



accepted
public boolean accepted(Code)
Flag that is set if the offer has been accepted, that is, if the expression has changed



action
public int action(Code)
action is one of the possible promotion actions, FOCUS_INDEPENDENT, RANGE_INDEPENDENT, INLINE_VARIABLE_REFERENCES, ANY_ORDER, ANY_ORDER_UNIQUE



bindingList
public Binding[] bindingList(Code)
In the case of RANGE_INDEPENDENT and WHERE_CLAUSE, "binding" identifies the range variables whose dependencies we are looking for. For INLINE_VARIABLE_REFERENCES it is a single Binding that we are aiming to inline



containingExpression
public Expression containingExpression(Code)
When a promotion offer is made, containingExpression identifies the level to which the promotion should occur. When a subexpression is promoted, an expression of the form let $VAR := SUB return ORIG is created, and this replaces the original containingExpression within the PromotionOffer.



mustEliminateDuplicates
public boolean mustEliminateDuplicates(Code)
In the case of UNORDERED, "mustEliminateDuplicates" is a boolean that is set to true if the nodes can be delivered in any order so long as there are no duplicates (for example, as required by the count() function). If this boolean is false, the nodes can be delivered in any order and duplicates are allowed (for example, as required by the boolean() function).



promoteDocumentDependent
public boolean promoteDocumentDependent(Code)
In the case of FOCUS_INDEPENDENT, "promoteDocumentDependent" is a boolean that, when set to true, indicates that it is safe to promote a subexpression that depends on the context document but not on other aspects of the focus. This is the case, for example, in a filter expression when it is known that all the nodes selected by the expression will be in the same document - as happens when the filter is applied to a path expression. This allows subexpressions such as key() to be promoted



promoteXSLTFunctions
public boolean promoteXSLTFunctions(Code)
In the case of FOCUS_INDEPENDENT, "promoteXSLTFunctions" is a boolean that, when set to true, indicates that it is safe to promote XSLT functions such as current(). This flag is set when rewriting XPath expressions and is unset when rewriting XSLT templates.




Constructor Detail
PromotionOffer
public PromotionOffer(Optimizer optimizer)(Code)
Create a PromotionOffer for use with a particular Optimizer




Method Detail
accept
public Expression accept(Expression child) throws XPathException(Code)
Method to test whether a subexpression qualifies for promotion, and if so, to accept the promotion. if promotion was done, returns the expression that should be used in placeof the child expression. If no promotion was done, returns null.



getOptimizer
public Optimizer getOptimizer()(Code)
Get the optimizer in use



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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