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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.data.util;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import com.vaadin.data.Container;
import com.vaadin.data.Container.Sortable;
import com.vaadin.data.Item;
import com.vaadin.data.Property;
/**
* Provides a default implementation of an ItemSorter. The
* <code>DefaultItemSorter</code> adheres to the
* {@link Sortable#sort(Object[], boolean[])} rules and sorts the container
* according to the properties given using
* {@link #setSortProperties(Sortable, Object[], boolean[])}.
* <p>
* A Comparator is used for comparing the individual <code>Property</code>
* values. The comparator can be set using the constructor. If no comparator is
* provided a default comparator is used.
*
*/
public class DefaultItemSorter implements ItemSorter {
private java.lang.Object[] sortPropertyIds;
private boolean[] sortDirections;
private Container container;
private Comparator<Object> propertyValueComparator;
/**
* Constructs a DefaultItemSorter using the default <code>Comparator</code>
* for comparing <code>Property</code>values.
*
*/
public DefaultItemSorter() {
this(new DefaultPropertyValueComparator());
}
/**
* Constructs a DefaultItemSorter which uses the <code>Comparator</code>
* indicated by the <code>propertyValueComparator</code> parameter for
* comparing <code>Property</code>values.
*
* @param propertyValueComparator
* The comparator to use when comparing individual
* <code>Property</code> values
*/
public DefaultItemSorter(Comparator<Object> propertyValueComparator) {
this.propertyValueComparator = propertyValueComparator;
}
/*
* (non-Javadoc)
*
* @see com.vaadin.data.util.ItemSorter#compare(java.lang.Object,
* java.lang.Object)
*/
public int compare(Object o1, Object o2) {
Item item1 = container.getItem(o1);
Item item2 = container.getItem(o2);
/*
* Items can be null if the container is filtered. Null is considered
* "less" than not-null.
*/
if (item1 == null) {
if (item2 == null) {
return 0;
} else {
return 1;
}
} else if (item2 == null) {
return -1;
}
for (int i = 0; i < sortPropertyIds.length; i++) {
int result = compareProperty(sortPropertyIds[i], sortDirections[i],
item1, item2);
// If order can be decided
if (result != 0) {
return result;
}
}
return 0;
}
/**
* Compares the property indicated by <code>propertyId</code> in the items
* indicated by <code>item1</code> and <code>item2</code> for order. Returns
* a negative integer, zero, or a positive integer as the property value in
* the first item is less than, equal to, or greater than the property value
* in the second item. If the <code>sortDirection</code> is false the
* returned value is negated.
* <p>
* The comparator set for this <code>DefaultItemSorter</code> is used for
* comparing the two property values.
*
* @param propertyId
* The property id for the property that is used for comparison.
* @param sortDirection
* The direction of the sort. A false value negates the result.
* @param item1
* The first item to compare.
* @param item2
* The second item to compare.
* @return a negative, zero, or positive integer if the property value in
* the first item is less than, equal to, or greater than the
* property value in the second item. Negated if
* {@code sortDirection} is false.
*/
protected int compareProperty(Object propertyId, boolean sortDirection,
Item item1, Item item2) {
// Get the properties to compare
final Property property1 = item1.getItemProperty(propertyId);
final Property property2 = item2.getItemProperty(propertyId);
// Get the values to compare
final Object value1 = (property1 == null) ? null : property1.getValue();
final Object value2 = (property2 == null) ? null : property2.getValue();
// Result of the comparison
int r = 0;
if (sortDirection) {
r = propertyValueComparator.compare(value1, value2);
} else {
r = propertyValueComparator.compare(value2, value1);
}
return r;
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.data.util.ItemSorter#setSortProperties(com.vaadin.data.Container
* .Sortable, java.lang.Object[], boolean[])
*/
public void setSortProperties(Container.Sortable container,
Object[] propertyId, boolean[] ascending) {
this.container = container;
// Removes any non-sortable property ids
final List<Object> ids = new ArrayList<Object>();
final List<Boolean> orders = new ArrayList<Boolean>();
final Collection<?> sortable = container
.getSortableContainerPropertyIds();
for (int i = 0; i < propertyId.length; i++) {
if (sortable.contains(propertyId[i])) {
ids.add(propertyId[i]);
orders.add(Boolean.valueOf(i < ascending.length ? ascending[i]
: true));
}
}
sortPropertyIds = ids.toArray();
sortDirections = new boolean[orders.size()];
for (int i = 0; i < sortDirections.length; i++) {
sortDirections[i] = (orders.get(i)).booleanValue();
}
}
/**
* Provides a default comparator used for comparing {@link Property} values.
* The <code>DefaultPropertyValueComparator</code> assumes all objects it
* compares can be cast to Comparable.
*
*/
public static class DefaultPropertyValueComparator implements
Comparator<Object>, Serializable {
@SuppressWarnings("unchecked")
public int compare(Object o1, Object o2) {
int r = 0;
// Normal non-null comparison
if (o1 != null && o2 != null) {
// Assume the objects can be cast to Comparable, throw
// ClassCastException otherwise.
r = ((Comparable<Object>) o1).compareTo(o2);
} else if (o1 == o2) {
// Objects are equal if both are null
r = 0;
} else {
if (o1 == null) {
r = -1; // null is less than non-null
} else {
r = 1; // non-null is greater than null
}
}
return r;
}
}
}
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