com.groiss.ds

Class JsonComparator

java.lang.Object

com.groiss.ds.JsonComparator

All Implemented Interfaces:

Comparator<JSONObject>

public class JsonComparator
extends Object
implements Comparator<JSONObject>

Compares json objects according to the passed attributes. If the attribute name starts with '-' this indicates descending order. If not or if it starts with a blank this indicates ascending order. Comparison is done as follows:

1. if attribute holds Strings StringUtil.getCollator() will be used
2. if attribute holds Comparable its compare-method will be used
3. for all other cases the toString() result will be compared - again with StringUtil.getCollator()

Author:

robert

Constructor Summary

Constructors

Constructor and Description
JsonComparator(String attributes) Creates a new comparator object to sort according to the passed attributes
JsonComparator(String[] attributes) Creates a new comparator object to sort according to the passed attributes

Method Summary

Modifier and Type	Method and Description
int	compare(JSONObject a, JSONObject b)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

JsonComparator

public JsonComparator(String attributes)

Creates a new comparator object to sort according to the passed attributes

Parameters:

attributes - the name of the attributes by which sorting should be performed, e.g. "firstAttr,-secondAttr" means first sort ascending by 'firstAttr' and then (if necessary) sort descending by 'secondAttr'

JsonComparator

public JsonComparator(String[] attributes)

Creates a new comparator object to sort according to the passed attributes

Parameters:

attributes - the name of the attributes by which sorting should be performed, e.g. ["firstAttr","-secondAttr"] means first sort ascending by 'firstAttr' and then (if necessary) sort descending by 'secondAttr'

Method Detail

compare

public int compare(JSONObject a,
                   JSONObject b)

Specified by:

compare in interface Comparator<JSONObject>