org.apache.cayenne.util

Class CompareToBuilder

java.lang.Object

org.apache.cayenne.util.CompareToBuilder

public class CompareToBuilder
extends Object

Assists in implementing Comparable.compareTo(Object) methods. This code is based on CompareToBuilder from commons-lang v2.6

Since:

4.1

Constructor Summary

Constructors

Constructor and Description
CompareToBuilder() Constructor for CompareToBuilder.

Method Summary

Modifier and Type	Method and Description
CompareToBuilder	append(boolean[] lhs, boolean[] rhs) Appends to the builder the deep comparison of two boolean arrays.
CompareToBuilder	append(boolean lhs, boolean rhs) Appends to the builder the comparison of two booleanss.
CompareToBuilder	append(byte[] lhs, byte[] rhs) Appends to the builder the deep comparison of two byte arrays.
CompareToBuilder	append(byte lhs, byte rhs) Appends to the builder the comparison of two bytes.
CompareToBuilder	append(char[] lhs, char[] rhs) Appends to the builder the deep comparison of two char arrays.
CompareToBuilder	append(char lhs, char rhs) Appends to the builder the comparison of two chars.
CompareToBuilder	append(double[] lhs, double[] rhs) Appends to the builder the deep comparison of two double arrays.
CompareToBuilder	append(double lhs, double rhs) Appends to the builder the comparison of two doubles.
CompareToBuilder	append(float[] lhs, float[] rhs) Appends to the builder the deep comparison of two float arrays.
CompareToBuilder	append(float lhs, float rhs) Appends to the builder the comparison of two floats.
CompareToBuilder	append(int[] lhs, int[] rhs) Appends to the builder the deep comparison of two int arrays.
CompareToBuilder	append(int lhs, int rhs) Appends to the builder the comparison of two ints.
CompareToBuilder	append(long[] lhs, long[] rhs) Appends to the builder the deep comparison of two long arrays.
CompareToBuilder	append(long lhs, long rhs) Appends to the builder the comparison of two longs.
CompareToBuilder	append(Object[] lhs, Object[] rhs) Appends to the builder the deep comparison of two Object arrays.
CompareToBuilder	append(Object[] lhs, Object[] rhs, Comparator comparator) Appends to the builder the deep comparison of two Object arrays.
CompareToBuilder	append(Object lhs, Object rhs) Appends to the builder the comparison of two Objects.
CompareToBuilder	append(Object lhs, Object rhs, Comparator comparator) Appends to the builder the comparison of two Objects.
CompareToBuilder	append(short[] lhs, short[] rhs) Appends to the builder the deep comparison of two short arrays.
CompareToBuilder	append(short lhs, short rhs) Appends to the builder the comparison of two shorts.
CompareToBuilder	appendSuper(int superCompareTo) Appends to the builder the compareTo(Object) result of the superclass.
int	toComparison() Returns a negative integer, a positive integer, or zero as the builder has judged the "left-hand" side as less than, greater than, or equal to the "right-hand" side.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompareToBuilder

public CompareToBuilder()

Constructor for CompareToBuilder.

Starts off assuming that the objects are equal. Multiple calls are then made to the various append methods, followed by a call to toComparison() to get the result.

Method Detail

appendSuper

public CompareToBuilder appendSuper(int superCompareTo)

Appends to the builder the compareTo(Object) result of the superclass.

Parameters:

superCompareTo - result of calling super.compareTo(Object)

Returns:

this - used to chain append calls

append

public CompareToBuilder append(Object lhs,
                               Object rhs)

Appends to the builder the comparison of two Objects.

1. Check if lhs == rhs
2. Check if either lhs or rhs is null, a null object is less than a non-null object
3. Check the object contents

lhs must either be an array or implement Comparable.

Parameters:

lhs - left-hand object

rhs - right-hand object

Returns:

this - used to chain append calls

Throws:

ClassCastException - if rhs is not assignment-compatible with lhs

append

public CompareToBuilder append(Object lhs,
                               Object rhs,
                               Comparator comparator)

Appends to the builder the comparison of two Objects.

1. Check if lhs == rhs
2. Check if either lhs or rhs is null, a null object is less than a non-null object
3. Check the object contents

If lhs is an array, array comparison methods will be used. Otherwise comparator will be used to compare the objects. If comparator is null, lhs must implement Comparable instead.

Parameters:

lhs - left-hand object

rhs - right-hand object

comparator - Comparator used to compare the objects, null means treat lhs as Comparable

Returns:

this - used to chain append calls

Throws:

ClassCastException - if rhs is not assignment-compatible with lhs

Since:

2.0

append

public CompareToBuilder append(long lhs,
                               long rhs)

Appends to the builder the comparison of two longs.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(int lhs,
                               int rhs)

Appends to the builder the comparison of two ints.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(short lhs,
                               short rhs)

Appends to the builder the comparison of two shorts.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(char lhs,
                               char rhs)

Appends to the builder the comparison of two chars.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(byte lhs,
                               byte rhs)

Appends to the builder the comparison of two bytes.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(double lhs,
                               double rhs)

Appends to the builder the comparison of two doubles.

This handles NaNs, Infinities, and -0.0.

It is compatible with the hash code generated by HashCodeBuilder.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(float lhs,
                               float rhs)

Appends to the builder the comparison of two floats.

This handles NaNs, Infinities, and -0.0.

It is compatible with the hash code generated by HashCodeBuilder.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(boolean lhs,
                               boolean rhs)

Appends to the builder the comparison of two booleanss.

Parameters:

lhs - left-hand value

rhs - right-hand value

Returns:

this - used to chain append calls

append

public CompareToBuilder append(Object[] lhs,
                               Object[] rhs)

Appends to the builder the deep comparison of two Object arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a short length array is less than a long length array
4. Check array contents element by element using append(Object, Object, Comparator)

This method will also will be called for the top level of multi-dimensional, ragged, and multi-typed arrays.

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

Throws:

ClassCastException - if rhs is not assignment-compatible with lhs

append

public CompareToBuilder append(Object[] lhs,
                               Object[] rhs,
                               Comparator comparator)

Appends to the builder the deep comparison of two Object arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a short length array is less than a long length array
4. Check array contents element by element using append(Object, Object, Comparator)

This method will also will be called for the top level of multi-dimensional, ragged, and multi-typed arrays.

Parameters:

lhs - left-hand array

rhs - right-hand array

comparator - Comparator to use to compare the array elements, null means to treat lhs elements as Comparable.

Returns:

this - used to chain append calls

Throws:

ClassCastException - if rhs is not assignment-compatible with lhs

Since:

2.0

append

public CompareToBuilder append(long[] lhs,
                               long[] rhs)

Appends to the builder the deep comparison of two long arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(long, long)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(int[] lhs,
                               int[] rhs)

Appends to the builder the deep comparison of two int arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(int, int)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(short[] lhs,
                               short[] rhs)

Appends to the builder the deep comparison of two short arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(short, short)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(char[] lhs,
                               char[] rhs)

Appends to the builder the deep comparison of two char arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(char, char)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(byte[] lhs,
                               byte[] rhs)

Appends to the builder the deep comparison of two byte arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(byte, byte)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(double[] lhs,
                               double[] rhs)

Appends to the builder the deep comparison of two double arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(double, double)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(float[] lhs,
                               float[] rhs)

Appends to the builder the deep comparison of two float arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(float, float)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

append

public CompareToBuilder append(boolean[] lhs,
                               boolean[] rhs)

Appends to the builder the deep comparison of two boolean arrays.

1. Check if arrays are the same using ==
2. Check if for null, null is less than non-null
3. Check array length, a shorter length array is less than a longer length array
4. Check array contents element by element using append(boolean, boolean)

Parameters:

lhs - left-hand array

rhs - right-hand array

Returns:

this - used to chain append calls

toComparison

public int toComparison()

Returns a negative integer, a positive integer, or zero as the builder has judged the "left-hand" side as less than, greater than, or equal to the "right-hand" side.

Returns:

final comparison result