org.apache.bcel.generic

Class SWITCH

java.lang.Object

org.apache.bcel.generic.SWITCH

All Implemented Interfaces:

CompoundInstruction

public final class SWITCH
extends java.lang.Object
implements CompoundInstruction

SWITCH - Branch depending on int value, generates either LOOKUPSWITCH or TABLESWITCH instruction, depending on whether the match values (int[]) can be sorted with no gaps between the numbers.

Version:

$Id$

Field Summary

Fields

Modifier and Type	Field and Description
private Select	instruction
private int[]	match
private int	match_length
private InstructionHandle[]	targets

Constructor Summary

Constructors

Constructor and Description
SWITCH(int[] match, InstructionHandle[] targets, InstructionHandle target)
SWITCH(int[] match, InstructionHandle[] targets, InstructionHandle target, int max_gap) Template for switch() constructs.

Method Summary

Modifier and Type	Method and Description
private void	fillup(int max_gap, InstructionHandle target)
Instruction	getInstruction()
InstructionList	getInstructionList()
private boolean	matchIsOrdered(int max_gap)
private void	sort(int l, int r) Sort match and targets array with QuickSort.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

match

private int[] match

targets

private InstructionHandle[] targets

instruction

private Select instruction

match_length

private int match_length

Constructor Detail

SWITCH

public SWITCH(int[] match,
              InstructionHandle[] targets,
              InstructionHandle target,
              int max_gap)

Template for switch() constructs. If the match array can be sorted in ascending order with gaps no larger than max_gap between the numbers, a TABLESWITCH instruction is generated, and a LOOKUPSWITCH otherwise. The former may be more efficient, but needs more space. Note, that the key array always will be sorted, though we leave the original arrays unaltered.

Parameters:

match - array of match values (case 2: ... case 7: ..., etc.)

targets - the instructions to be branched to for each case

target - the default target

max_gap - maximum gap that may between case branches

SWITCH

public SWITCH(int[] match,
              InstructionHandle[] targets,
              InstructionHandle target)

Method Detail

fillup

private void fillup(int max_gap,
                    InstructionHandle target)

sort

private void sort(int l,
                  int r)

Sort match and targets array with QuickSort.

matchIsOrdered

private boolean matchIsOrdered(int max_gap)

Returns:

match is sorted in ascending order with no gap bigger than max_gap?

getInstructionList

public final InstructionList getInstructionList()

Specified by:

getInstructionList in interface CompoundInstruction

getInstruction

public final Instruction getInstruction()