Top Description Fields Constructors Methods
org.apache.bcel.generic

public final Class SWITCH

extends Object
implements CompoundInstruction
Class Inheritance
All Implemented Interfaces
org.apache.bcel.generic.CompoundInstruction
Imports
java.util.Arrays
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.

Field Summary

Modifier and TypeField and Description
private final Select
instruction

Constructor Summary

AccessConstructor and Description
public
SWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle target)

public
SWITCH(final int[]
array of match values (case 2: ... case 7: ..., etc.)
match, final InstructionHandle[]
the instructions to be branched to for each case
targets, final InstructionHandle
the default target
target, final int
maximum gap that may between case branches
maxGap)

Template for switch() constructs.

Method Summary

Modifier and TypeMethod and Description
public Instruction
getInstruction()

public InstructionList
getInstructionList()

Implements org.apache.bcel.generic.CompoundInstruction.getInstructionList.

private static boolean

Returns:

match is sorted in ascending order with no gap bigger than maxGap?
matchIsOrdered(final int[] match, final int matchLength, final int maxGap)

private static void
sort(final int l, final int r, final int[] match, final InstructionHandle[] targets)

Sorts match and targets array with QuickSort.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

instructionback to summary
private final Select instruction

Constructor Detail

SWITCHback to summary
public SWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle target)
SWITCHback to summary
public SWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle target, final int maxGap)

Template for switch() constructs. If the match array can be sorted in ascending order with gaps no larger than maxGap 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:int[]

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

targets:InstructionHandle[]

the instructions to be branched to for each case

target:InstructionHandle

the default target

maxGap:int

maximum gap that may between case branches

Method Detail

getInstructionback to summary
public Instruction getInstruction()
getInstructionListback to summary
public InstructionList getInstructionList()

Implements org.apache.bcel.generic.CompoundInstruction.getInstructionList.

Annotations
@Override
matchIsOrderedback to summary
private static boolean matchIsOrdered(final int[] match, final int matchLength, final int maxGap)
Returns:boolean

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

sortback to summary
private static void sort(final int l, final int r, final int[] match, final InstructionHandle[] targets)

Sorts match and targets array with QuickSort.