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com.sun.org.apache.xalan.internal.xsltc.compiler

pack-priv final Class TestSeq

Class Inheritance

extends Object

java.lang.Object
com.sun.org.apache.xalan.internal.xsltc.compiler.TestSeq

Imports

com.sun.org.apache.bcel.internal.generic.GOTO_W, .InstructionHandle, .InstructionList, com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator, .MethodGenerator, java.util.ArrayList, .List, .Map

A test sequence is a sequence of patterns that (1) occured in templates in the same mode (2) share the same kernel node type (e.g. A/B and C/C/B) (3) may also contain patterns matching "*" and "node()" (element sequence only) or matching "@*" (attribute sequence only). A test sequence may have a default template, which will be instantiated if none of the other patterns match.

Authors: Jacek Ambroziak, Santiago Pericas-Geertsen, Erwin Bolwidt , Morten Jorgensen

Field Summary

Modifier and Type	Field and Description
private Template	_default Default template for this test sequence
private InstructionList	_instructionList Instruction list representing this test sequence.
private int	_kernelType Integer code for the kernel type of this test sequence
private Mode	_mode A reference to the Mode object.
private List<LocationPathPattern>	_patterns ArrayList of all patterns in the test sequence.
private InstructionHandle	_start Cached handle to avoid compiling more than once.

Constructor Summary

Access	Constructor and Description
public	TestSeq(List<LocationPathPattern> patterns, Mode mode) Creates a new test sequence given a set of patterns and a mode.
public	TestSeq(List<LocationPathPattern> patterns, int kernelType, Mode mode)

Method Summary

Modifier and Type	Method and Description
public InstructionHandle	compile(ClassGenerator classGen, MethodGenerator methodGen, InstructionHandle continuation) Compile the code for this test sequence.
public void	findTemplates(Map<Template, Object> templates) Returns, by reference, the templates that are included in this test sequence.
public InstructionList	getInstructionList() Returns the instruction list for this test sequence
private LocationPathPattern	getPattern(int n) Returns pattern n in this test sequence
public int	getPosition() Returns the position of the highest priority pattern in this test sequence.
public double	getPriority() Return the highest priority for a pattern in this test sequence.
private InstructionHandle	getTemplateHandle(Template template) Get the instruction handle to a template's code.
public void	reduce() Reduce the patterns in this test sequence.
public String	toString() Overrides java.lang.Object.toString. Returns a string representation of this test sequence.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Field Detail

_default	back to summary
private Template _default Default template for this test sequence

_instructionList	back to summary
private InstructionList _instructionList Instruction list representing this test sequence.

_kernelType	back to summary
private int _kernelType Integer code for the kernel type of this test sequence

_mode	back to summary
private Mode _mode A reference to the Mode object.

_patterns	back to summary
private List<LocationPathPattern> _patterns ArrayList of all patterns in the test sequence. May include patterns with "", "@" or "node()" kernel.

_start	back to summary
private InstructionHandle _start Cached handle to avoid compiling more than once.

Constructor Detail

TestSeq	back to summary
public TestSeq(List<LocationPathPattern> patterns, Mode mode) Creates a new test sequence given a set of patterns and a mode.

TestSeq	back to summary
public TestSeq(List<LocationPathPattern> patterns, int kernelType, Mode mode)

Method Detail

compile	back to summary
public InstructionHandle compile(ClassGenerator classGen, MethodGenerator methodGen, InstructionHandle continuation) Compile the code for this test sequence. Compile patterns from highest to lowest priority. Note that since patterns can be share by multiple test sequences, instruction lists must be copied before backpatching.

findTemplates	back to summary
public void findTemplates(Map<Template, Object> templates) Returns, by reference, the templates that are included in this test sequence. Note that a single template can occur in several test sequences if its pattern is a union.

getInstructionList	back to summary
public InstructionList getInstructionList() Returns the instruction list for this test sequence

getPattern	back to summary
private LocationPathPattern getPattern(int n) Returns pattern n in this test sequence

getPosition	back to summary
public int getPosition() Returns the position of the highest priority pattern in this test sequence.

getPriority	back to summary
public double getPriority() Return the highest priority for a pattern in this test sequence. This is either the priority of the first or of the default pattern.

getTemplateHandle	back to summary
private InstructionHandle getTemplateHandle(Template template) Get the instruction handle to a template's code. This is used when a single template occurs in several test sequences; that is, if its pattern is a union of patterns (e.g. match="A/B \| A/C").

reduce	back to summary
public void reduce() Reduce the patterns in this test sequence. Creates a new vector of patterns and sets the default pattern if it finds a patterns that is fully reduced.

toString

back to summary

public String toString()

Overrides java.lang.Object.toString.

Returns a string representation of this test sequence. Notice that test sequences are mutable, so the value returned by this method is different before and after calling reduce().