org.apache.xalan.xsltc.compiler
Class Pattern

java.lang.Object
  |
  +--org.apache.xalan.xsltc.compiler.SyntaxTreeNode
        |
        +--org.apache.xalan.xsltc.compiler.Expression
              |
              +--org.apache.xalan.xsltc.compiler.Pattern

Direct Known Subclasses:

LocationPathPattern

public abstract class Pattern

extends org.apache.xalan.xsltc.compiler.Expression

Fields inherited from class org.apache.xalan.xsltc.compiler.SyntaxTreeNode

UNKNOWN_STYLESHEET_NODE_ID

Constructor Summary

Pattern()

Method Summary

abstract double	getPriority() Returns the priority of this pattern (section 5.5 in the XSLT spec).
abstract void	translate(ClassGenerator classGen, MethodGenerator methodGen) Translate this node into JVM bytecodes.
abstract Type	typeCheck(org.apache.xalan.xsltc.compiler.SymbolTable stable) Returns the type of a pattern, which is always a NodeType.

Methods inherited from class org.apache.xalan.xsltc.compiler.Expression

backPatchFalseList, backPatchTrueList, compile, desynthesize, evaluateAtCompileTime, getFalseList, getTrueList, getType, hasLastCall, hasPositionCall, lookupPrimop, startIterator, synthesize, toString, translateDesynthesized

Methods inherited from class org.apache.xalan.xsltc.compiler.SyntaxTreeNode

display, getLineNumber, getParser, getStylesheet, parseContents

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Pattern

public Pattern()

Method Detail

typeCheck

public abstract Type typeCheck(org.apache.xalan.xsltc.compiler.SymbolTable stable)
                        throws TypeCheckError

Returns the type of a pattern, which is always a NodeType. A NodeType has a number of subtypes defined by NodeType._type corresponding to each type of node.

Overrides:

typeCheck in class org.apache.xalan.xsltc.compiler.Expression

translate

public abstract void translate(ClassGenerator classGen,
                               MethodGenerator methodGen)

Translate this node into JVM bytecodes. Patterns are translated as boolean expressions with true/false lists. Before calling translate on a pattern, make sure that the node being matched is on top of the stack. After calling translate, make sure to backpatch both true and false lists. True lists are the default, in the sense that they always "fall through". If this is not the intended semantics (e.g., see org.apache.xalan.xsltc.compiler.AlternativePattern#translate) then a GOTO must be appended to the instruction list after calling translate.

Overrides:

translate in class org.apache.xalan.xsltc.compiler.Expression

getPriority

public abstract double getPriority()

Returns the priority of this pattern (section 5.5 in the XSLT spec).