OpenJDK 27 · com.sun.org.apache.xalan.internal.xsltc.compiler.Predicate

Field Summary

Modifier and Type	Field and Description
private boolean	_canOptimize This flag indicates if optimizations are turned on.
private String	_className Name of the inner class.
private List<VariableRefBase>	_closureVars List of variables in closure.
private Expression	_exp The predicate's expression.
private boolean	_nthDescendant Flag indicatig if the nth position descendant is on.
private boolean	_nthPositionFilter Flag indicatig if the nth position optimization is on.
private Closure	_parentClosure Reference to parent closure.
pack-priv int	_ptype Cached node type of the expression that owns this predicate.
private Step	_step Cached value of method `getCompareValue()`.
private Expression	_value Cached value of method `getCompareValue()`.

Inherited from com.sun.org.apache.xalan.internal.xsltc.compiler.Expression:: _falseList _trueList _type

Constructor Summary

Access	Constructor and Description
public	Predicate(Expression exp) Initializes a predicate.

Method Summary

Modifier and Type	Method and Description
public void	addVariable(VariableRefBase variableRef) Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.addVariable. Add new variable to the closure.
private void	compileFilter(ClassGenerator classGen, MethodGenerator methodGen) Create a new "Filter" class implementing `CurrentNodeListFilter`.
public void	dontOptimize() Turns off all optimizations for this predicate.
public Expression	getCompareValue() Returns the value in an expression of the form 'step = value'.
public Expression	getExpr()
public String	getInnerClassName() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getInnerClassName. Returns the name of the auxiliary class or null if this predicate is compiled inside the Translet.
public Closure	getParentClosure() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getParentClosure. Returns a reference to its parent closure or null if outermost.
public int	getPosType() Returns the node type of the expression owning this predicate.
public Step	getStep() Returns the step in an expression of the form 'step = value'.
public boolean	hasLastCall() Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasLastCall. Returns true if the expression in this predicate contains a call to last().
public boolean	hasPositionCall() Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasPositionCall. Returns true if the expression in this predicate contains a call to position().
public boolean	inInnerClass() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.inInnerClass. Returns true if this closure is compiled in an inner class (i.e. if this is a real closure).
public boolean	isBooleanTest() Returns true if the predicate is a test for the existance of an element or attribute.
public boolean	isNodeValueTest() Method to see if we can optimise the predicate by using a specialised iterator for expressions like '/foo/bar[@attr = $var]', which are very common in many stylesheets
public boolean	isNthDescendant() Returns a boolean value indicating if the nth descendant optimization is on.
public boolean	isNthPositionFilter() Returns a boolean value indicating if the nth position optimization is on.
public boolean	parentIsPattern()
public void	setParser(Parser parser) Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.SyntaxTreeNode.setParser. Set the parser for this expression.
public String	toString() Implements abstract com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.toString. Returns a string representation of the object.
public void	translate(ClassGenerator classGen, MethodGenerator methodGen) Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.translate. Translate a predicate expression.
public void	translateFilter(ClassGenerator classGen, MethodGenerator methodGen) Translate a predicate expression.
public Type	typeCheck(SymbolTable stable) Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.typeCheck. Type check a predicate expression.

Inherited from com.sun.org.apache.xalan.internal.xsltc.compiler.Expression:: backPatchFalseList backPatchTrueList compile desynthesize evaluateAtCompileTime getFalseList getTrueList getType lookupPrimop startIterator synthesize translateDesynthesized

Field Detail

_canOptimize	back to summary
private boolean _canOptimize This flag indicates if optimizations are turned on. The method `dontOptimize()` can be called to turn optimizations off.

_className	back to summary
private String _className Name of the inner class.

_closureVars	back to summary
private List<VariableRefBase> _closureVars List of variables in closure.

_exp	back to summary
private Expression _exp The predicate's expression.

_nthDescendant	back to summary
private boolean _nthDescendant Flag indicatig if the nth position descendant is on. It is set in `typeCheck()`.

_nthPositionFilter	back to summary
private boolean _nthPositionFilter Flag indicatig if the nth position optimization is on. It is set in `typeCheck()`.

_parentClosure	back to summary
private Closure _parentClosure Reference to parent closure.

_ptype	back to summary
pack-priv int _ptype Cached node type of the expression that owns this predicate.

_step	back to summary
private Step _step Cached value of method `getCompareValue()`.

_value	back to summary
private Expression _value Cached value of method `getCompareValue()`.

Constructor Detail

Predicate	back to summary
public Predicate(Expression exp) Initializes a predicate.

Method Detail

addVariable	back to summary
public void addVariable(VariableRefBase variableRef) Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.addVariable. Add new variable to the closure.

addVariable

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public void addVariable(VariableRefBase variableRef)

Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.addVariable.

Add new variable to the closure.

compileFilter	back to summary
private void compileFilter(ClassGenerator classGen, MethodGenerator methodGen) Create a new "Filter" class implementing `CurrentNodeListFilter`. Allocate registers for local variables and local parameters passed in the closure to test(). Notice that local variables need to be "unboxed".

dontOptimize	back to summary
public void dontOptimize() Turns off all optimizations for this predicate.

getCompareValue	back to summary
public Expression getCompareValue() Returns the value in an expression of the form 'step = value'. A value may be either a literal string or a variable whose type is string. Optimization if off if null is returned.

getExpr	back to summary
public Expression getExpr()

getInnerClassName	back to summary
public String getInnerClassName() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getInnerClassName. Returns the name of the auxiliary class or null if this predicate is compiled inside the Translet.

getInnerClassName

back to summary

public String getInnerClassName()

Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getInnerClassName.

Returns the name of the auxiliary class or null if this predicate is compiled inside the Translet.

getParentClosure	back to summary
public Closure getParentClosure() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getParentClosure. Returns a reference to its parent closure or null if outermost.

getParentClosure

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public Closure getParentClosure()

Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.getParentClosure.

Returns a reference to its parent closure or null if outermost.

getPosType	back to summary
public int getPosType() Returns the node type of the expression owning this predicate. The return value is cached in `_ptype`.

getStep	back to summary
public Step getStep() Returns the step in an expression of the form 'step = value'. Null is returned if the expression is not of the right form. Optimization if off if null is returned.

hasLastCall	back to summary
public boolean hasLastCall() Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasLastCall. Returns true if the expression in this predicate contains a call to last().

hasLastCall

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public boolean hasLastCall()

Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasLastCall.

Returns true if the expression in this predicate contains a call to last().

hasPositionCall	back to summary
public boolean hasPositionCall() Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasPositionCall. Returns true if the expression in this predicate contains a call to position().

hasPositionCall

back to summary

public boolean hasPositionCall()

Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.hasPositionCall.

Returns true if the expression in this predicate contains a call to position().

inInnerClass	back to summary
public boolean inInnerClass() Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.inInnerClass. Returns true if this closure is compiled in an inner class (i.e. if this is a real closure).

inInnerClass

back to summary

public boolean inInnerClass()

Implements com.sun.org.apache.xalan.internal.xsltc.compiler.Closure.inInnerClass.

Returns true if this closure is compiled in an inner class (i.e. if this is a real closure).

isBooleanTest	back to summary
public boolean isBooleanTest() Returns true if the predicate is a test for the existance of an element or attribute. All we have to do is to get the first node from the step, check if it is there, and then return true/false.

isNodeValueTest	back to summary
public boolean isNodeValueTest() Method to see if we can optimise the predicate by using a specialised iterator for expressions like '/foo/bar[@attr = $var]', which are very common in many stylesheets

isNthDescendant	back to summary
public boolean isNthDescendant() Returns a boolean value indicating if the nth descendant optimization is on. Must be call after type checking!

isNthPositionFilter	back to summary
public boolean isNthPositionFilter() Returns a boolean value indicating if the nth position optimization is on. Must be call after type checking!

parentIsPattern	back to summary
public boolean parentIsPattern()

setParser	back to summary
public void setParser(Parser parser) Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.SyntaxTreeNode.setParser. Set the parser for this expression.

setParser

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public void setParser(Parser parser)

Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.SyntaxTreeNode.setParser.

Set the parser for this expression.

toString back to summary

toString	back to summary
public String toString() Implements abstract com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.toString. Doc from java.lang.Object.toString. Returns a string representation of the object. Satisfying this method's contract implies a non-`null` result must be returned.

public String toString()

Implements abstract com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.toString.

Doc from java.lang.Object.toString.

Returns a string representation of the object. Satisfying this method's contract implies a non-null result must be returned.

translate back to summary

translate	back to summary
public void translate(ClassGenerator classGen, MethodGenerator methodGen) Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.translate. Translate a predicate expression. If non of the optimizations apply then this translation pushes two references on the stack: a reference to a newly created filter object and a reference to the predicate's closure. See class `Step` for further details.

public void translate(ClassGenerator classGen, MethodGenerator methodGen)

Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.translate.

Translate a predicate expression. If non of the optimizations apply then this translation pushes two references on the stack: a reference to a newly created filter object and a reference to the predicate's closure. See class Step for further details.

translateFilter	back to summary
public void translateFilter(ClassGenerator classGen, MethodGenerator methodGen) Translate a predicate expression. This translation pushes two references on the stack: a reference to a newly created filter object and a reference to the predicate's closure.

typeCheck back to summary

typeCheck	back to summary
public Type typeCheck(SymbolTable stable) throws TypeCheckError Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.typeCheck. Type check a predicate expression. If the type of the expression is number convert it to boolean by adding a comparison with position(). Note that if the expression is a parameter, we cannot distinguish at compile time if its type is number or not. Hence, expressions of reference type are always converted to booleans. This method may be called twice, before and after calling `dontOptimize()`. If so, the second time it should honor the new value of `_canOptimize`.

public Type typeCheck(SymbolTable stable) throws TypeCheckError

Overrides com.sun.org.apache.xalan.internal.xsltc.compiler.Expression.typeCheck.

Type check a predicate expression. If the type of the expression is number convert it to boolean by adding a comparison with position(). Note that if the expression is a parameter, we cannot distinguish at compile time if its type is number or not. Hence, expressions of reference type are always converted to booleans. This method may be called twice, before and after calling dontOptimize(). If so, the second time it should honor the new value of _canOptimize.

pack-priv final Class Predicate

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