org.eclipse.xtext.xbase.lib

Class IntegerRange

java.lang.Object

org.eclipse.xtext.xbase.lib.IntegerRange

All Implemented Interfaces:

java.lang.Iterable<java.lang.Integer>

@GwtCompatible
public class IntegerRange
extends java.lang.Object
implements java.lang.Iterable<java.lang.Integer>

A sequence of integers starting from start up to end with an increment of step. The value of start is always included. The value of end is included only if the difference between end-start is a multiple of step. The step can be positive or negative, but never 0. It must have the same signum as of end-start.

Since:

2.3

Author:

Jan Koehnlein - Initial contribution and API

Constructor Summary

Constructors

Constructor and Description
IntegerRange(int start, int end) Constructs a new IntegerRange object.
IntegerRange(int start, int end, int step) Constructs a new IntegerRange object.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	contains(int number) Checks whether this contains the given number, i.e.
int	getEnd()
int	getSize() Returns the number of elements in this IntegerRange.
int	getStart()
int	getStep()
java.util.ListIterator<java.lang.Integer>	iterator()
IntegerRange	withStep(int step)

Methods inherited from class java.lang.Object

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

Constructor Detail

IntegerRange

@Pure
public IntegerRange(int start,
                 int end)

Constructs a new IntegerRange object. The step will be set to -1 if end

Parameters:

start - the start value (inclusive)

end - the end value (inclusive)

IntegerRange

@Pure
public IntegerRange(int start,
                 int end,
                 int step)

Constructs a new IntegerRange object.

Parameters:

start - the start value (inclusive)

end - the end value (inclusive if end-start%step == 0)

step - the increment

Method Detail

iterator

@Pure
public java.util.ListIterator<java.lang.Integer> iterator()

Specified by:

iterator in interface java.lang.Iterable<java.lang.Integer>

Returns:

a read-only ListIterator for this.

getStart

@Pure
public int getStart()

Returns:

the start value

getStep

@Pure
public int getStep()

Returns:

the step value

getEnd

@Pure
public int getEnd()

Returns:

the end value

getSize

@Pure
public int getSize()

Returns the number of elements in this IntegerRange. That is not the length of the interval, but (end-start)/step + 1.

Returns:

the number of elements in this IntegerRange.

withStep

@Pure
public IntegerRange withStep(int step)

Parameters:

step - the step of the new range.

Returns:

a new IntegerRange with the given step.

contains

@Pure
public boolean contains(int number)

Checks whether this contains the given number, i.e. whether the iterator will yield the number. This is different from interval containment: 0..2.by(2) will not contain 1.

Parameters:

number - the number to be checked for containment.

Returns:

whether this sequence contains the given number or not.