org.bremersee.comparator.model

Class ComparatorField

java.lang.Object

org.bremersee.comparator.model.ComparatorField

public class ComparatorField
extends Object

This class defines the sort order of a field.

  ---------------------------------------------------------------------------------------------
 | Attribute    | Description                                                       | Default  |
 |--------------|-------------------------------------------------------------------|----------|
 | add          | The add name (or method name) of the object. It can be a path.    | null     |
 |              | The segments are separated by a dot (.): field0.field1.field2     |          |
 |--------------|-------------------------------------------------------------------|----------|
 | asc or desc  | Defines ascending or descending ordering.                         | asc      |
 |--------------|-------------------------------------------------------------------|----------|
 | ignoreCase   | Makes a case ignoring comparison (only for strings).              | true     |
 |--------------|-------------------------------------------------------------------|----------|
 | nullIsFirst  | Defines the ordering if one of the values is null.                | false    |
  ---------------------------------------------------------------------------------------------
 

These values have a 'well known text' representation. The values are concatenated with comma (,):

 fieldNameOrPath,asc,ignoreCase,nullIsFirst
 

For example:

 properties.customSettings.priority,asc,true,false
 

Defaults can be omitted. This is the same:

 properties.customSettings.priority
 

The building of a chain is done by concatenate the fields with a pipe (|):

 field0,asc,ignoreCase,nullIsFirst|field1,asc,ignoreCase,nullIsFirst
 

Author:

Christian Bremer

Constructor Summary

Constructors

Constructor and Description
ComparatorField() Instantiates a new comparator field.
ComparatorField(String field, boolean asc, boolean ignoreCase, boolean nullIsFirst) Instantiates a new comparator field.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getField() Gets field name or path.
int	hashCode()
boolean	isAsc() Is ascending or descending order.
boolean	isIgnoreCase() Is case insensitive or sensitive order.
boolean	isNullIsFirst() Is null is first.
String	toString()
String	toWkt() Creates the well known text of this field ordering description.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ComparatorField

public ComparatorField()

Instantiates a new comparator field.

ComparatorField

public ComparatorField(String field,
                       boolean asc,
                       boolean ignoreCase,
                       boolean nullIsFirst)

Instantiates a new comparator field.

Parameters:

field - the field name or path (can be null)

asc - true for an ascending order, false for a descending order

ignoreCase - true for a case insensitive order, false for a case sensitive order

nullIsFirst - specifies the order of null values

Method Detail

getField

public String getField()

Gets field name or path.

Returns:

the field name or path

isAsc

public boolean isAsc()

Is ascending or descending order.

Returns:

true if ascending order, false if descending order

isIgnoreCase

public boolean isIgnoreCase()

Is case insensitive or sensitive order.

Returns:

true if case insensitive order, false if case sensitive order

isNullIsFirst

public boolean isNullIsFirst()

Is null is first.

Returns:

true if null is first, otherwise false

toWkt

public String toWkt()

Creates the well known text of this field ordering description.

The syntax of the field ordering description is

 fieldNameOrPath,asc,ignoreCase,nullIsFirst
 

For example

 person.lastName,asc,true,false
 

Returns:

the well known text

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object