Example usage for org.jfree.data KeyedObjectComparatorType BY_VALUE

Introduction

In this page you can find the example usage for org.jfree.data KeyedObjectComparatorType BY_VALUE.

Prototype

KeyedObjectComparatorType BY_VALUE

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Document

An object representing 'by value' sorting.

Usage

From source file:org.jfree.data.KeyedObjectComparator.java

/**
 * Compares two {@link KeyedValue} instances and returns an
 * <code>int</code> that indicates the relative order of the two objects.
 *
 * @param o1  object 1./*from w w  w  .j a  va 2 s. co  m*/
 * @param o2  object 2.
 *
 * @return An int indicating the relative order of the objects.
 */
public int compare(Object o1, Object o2) {

    if (o2 == null) {
        return -1;
    }
    if (o1 == null) {
        return 1;
    }

    KeyedObject ko1 = (KeyedObject) o1;
    KeyedObject ko2 = (KeyedObject) o2;

    if (this.type == KeyedObjectComparatorType.BY_KEY) {
        if (this.order.equals(SortOrder.ASCENDING)) {
            return ko1.getKey().compareTo(ko2.getKey());
        } else if (this.order.equals(SortOrder.DESCENDING)) {
            return ko2.getKey().compareTo(ko1.getKey());
        } else {
            throw new IllegalArgumentException("Unrecognised sort order.");
        }
    } else if (this.type == KeyedObjectComparatorType.BY_VALUE) {
        Object n1 = ko1.getObject();
        Object n2 = ko2.getObject();
        Comparable c1 = "FALLBACK";
        if (n1 instanceof Comparable) {
            c1 = (Comparable) n1;
        }
        Comparable c2 = "FALLBACK";
        if (n2 instanceof Comparable) {
            c2 = (Comparable) n2;
        }
        if (n2 == null) {
            return -1;
        }
        if (n1 == null) {
            return 1;
        }
        if (this.order.equals(SortOrder.ASCENDING)) {
            return c1.compareTo(c2);
        } else if (this.order.equals(SortOrder.DESCENDING)) {
            return c2.compareTo(c1);
        } else {
            throw new IllegalArgumentException("Unrecognised sort order.");
        }
    } else {
        throw new IllegalArgumentException("Unrecognised type.");
    }
}

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