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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

arraylist, closure, comparable, comparable, comparator, list, numberawarecomparator, numberawarecomparator, object, object, orderby, orderby, t, util

The Groovy source code

 * Copyright 2003-2010 the original author or authors.
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package groovy.util;

import groovy.lang.Closure;
import org.codehaus.groovy.runtime.NumberAwareComparator;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

 * A helper class for sorting objects via a closure to return the field
 * or operation on which to sort.
 * @author <a href="">James Strachan
 * @version $Revision: 20330 $
public class OrderBy<T> implements Comparator {

    private final List<Closure> closures;
    private boolean equalityCheck;
    private final NumberAwareComparator<Object> numberAwareComparator = new NumberAwareComparator();

    public OrderBy() {
        this.closures = new ArrayList<Closure>();

    public OrderBy(Closure closure) {

    public OrderBy(List<Closure> closures) {
        this.closures = closures;

    public void add(Closure closure) {

    public int compare(T object1, T object2) {
        for (Closure closure : closures) {
            Object value1 =;
            Object value2 =;
            int result;
            if (!equalityCheck || (value1 instanceof Comparable && value2 instanceof Comparable)) {
                result =, value2);
            } else {
                result = DefaultTypeTransformation.compareEqual(value1, value2) ? 0 : -1;
            if (result == 0) continue;
            return result;
        return 0;

    public boolean isEqualityCheck() {
        return equalityCheck;

    public void setEqualityCheck(boolean equalityCheck) {
        this.equalityCheck = equalityCheck;

Other Groovy examples (source code examples)

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