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Simple opinionated Java for the novice to expert level Java Programmer.
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/*
* Copyright 2013-2014 Richard M. Hightower
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* __________ _____ __ .__
* \______ \ ____ ____ ____ /\ / \ _____ | | _|__| ____ ____
* | | _// _ \ / _ \ / \ \/ / \ / \\__ \ | |/ / |/ \ / ___\
* | | ( <_> | <_> ) | \ /\ / Y \/ __ \| <| | | \/ /_/ >
* |______ /\____/ \____/|___| / \/ \____|__ (____ /__|_ \__|___| /\___ /
* \/ \/ \/ \/ \/ \//_____/
* ____. ___________ _____ ______________.___.
* | |____ ___ _______ \_ _____/ / _ \ / _____/\__ | |
* | \__ \\ \/ /\__ \ | __)_ / /_\ \ \_____ \ / | |
* /\__| |/ __ \\ / / __ \_ | \/ | \/ \ \____ |
* \________(____ /\_/ (____ / /_______ /\____|__ /_______ / / ______|
* \/ \/ \/ \/ \/ \/
*/
package org.boon.sort;
import org.boon.Exceptions;
import org.boon.core.reflection.fields.FieldAccess;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import static org.boon.sort.Sorting.thisUniversalComparator;
/**
* Created by Richard on 3/8/14.
*/
public class SortingInternal {
/**
* This is the work horse. It does all of the sorting work for the simple cases.
* Nulls are last by default.
* @param list the list you want to sort.
* @param sortBy what you want to sort the list by.
* @param fields the reflection fields
* @param ascending true for ascending
*/
public static void sort( List list, String sortBy, Map fields, boolean ascending) {
sort(list, sortBy, fields, ascending, false);
}
/**
* This is the work horse. It does all of the sorting work for the simple cases.
* @param list the list you want to sort.
* @param sortBy what you want to sort the list by.
* @param fields the reflection fields
* @param ascending true for ascending
*/
public static void sort( List list, String sortBy, Map fields, boolean ascending,
boolean nullsFirst) {
try {
/* If this list is null or empty, we have nothing to do so return. */
if ( list == null || list.size() == 0 ) {
return;
}
/* Grab the first item in the list and see what it is. */
Object o = list.get( 0 );
/* if the sort by string is is this, and the object is comparable then use the objects
themselves for the sort.
*/
if ( sortBy.equals( "this" ) ) {
Collections.sort(list, thisUniversalComparator(ascending, nullsFirst));
return;
}
/* If you did not sort by "this", then sort by the field. */
final FieldAccess field = fields.get( sortBy );
if ( field != null ) {
Collections.sort( list, Sorting.universalComparator(field, ascending, nullsFirst) );
}
} catch (Exception ex) {
Exceptions.handle(ex, "list", list, "\nsortBy", sortBy, "fields", fields, "ascending", ascending,
"nullFirst", nullsFirst);
}
}
}