home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Groovy example source code file (OrderByTest.groovy)

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

Java - Groovy tags/keywords

atlanta, bob, bob, chris, james, james, joe, joe, leicester, london, london, orderby, raul, testperson

The Groovy OrderByTest.groovy source code

/*
 * Copyright 2003-2007 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
 *
 *     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.
 */
package groovy.util

/** 
 * Tests OrderBy
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @author Rod Code
 */
class OrderByTest extends GroovyTestCase {

    void testSortByOneField() {
        def builder = new NodeBuilder()
        def tree = builder.people {
            person(name: 'James', cheese: 'Edam', location: 'London')
            person(name: 'Bob', cheese: 'Cheddar', location: 'Atlanta')
            person(name: 'Chris', cheese: 'Red Leicester', location: 'London')
            person(name: 'Joe', cheese: 'Brie', location: 'London')
        }

        def people = tree.children()

        /** @todo parser should allow this syntax sugar
        def order = new OrderBy { it.get('@cheese') }
        */
        def order = new OrderBy({it.get('@cheese')})
        def sorted = people.sort(order)

        assert sorted.get(0).get('@name') == 'Joe'
        assert sorted.get(1).get('@name') == 'Bob'
        assert sorted.get(2).get('@name') == 'James'
        assert sorted.get(3).get('@name') == 'Chris'

        order = new OrderBy({it.get('@name')})
        sorted = people.sort(order)

        assert sorted.get(0).get('@name') == 'Bob'
        assert sorted.get(1).get('@name') == 'Chris'
        assert sorted.get(2).get('@name') == 'James'
        assert sorted.get(3).get('@name') == 'Joe'
    }

    void testSortByMultipleFields() {
        def builder = new NodeBuilder()
        def tree = builder.people {
            person(name: 'James', cheese: 'Edam', location: 'London')
            person(name: 'Bob', cheese: 'Cheddar', location: 'Atlanta')
            person(name: 'Chris', cheese: 'Red Leicester', location: 'London')
            person(name: 'Joe', cheese: 'Brie', location: 'London')
        }

        def people = tree.children()

        def order = new OrderBy([{it.get('@location')}, {it.get('@cheese')}])
        def sorted = people.sort(order)

        assert sorted.get(0).get('@name') == 'Bob'
        assert sorted.get(1).get('@name') == 'Joe'
        assert sorted.get(2).get('@name') == 'James'
        assert sorted.get(3).get('@name') == 'Chris'
    }

    void testSortByMultipleFieldsWithComparable() {
        def bob = new TestPerson(first: 'Bob', last: 'Barker', age: '10')
        def bobby = new TestPerson(first: 'Bob', last: 'Barker', age: '20')
        def raul = new TestPerson(first: 'Raul', last: 'Julia', age: '30')

        def people = [bobby, bob, raul]
        def order = new OrderBy([{it}, {it.age}])
        def sorted = people.sort(order)

        assert sorted[0].first == 'Bob'
        assert sorted[0].age == '10'
        assert sorted[1].first == 'Bob'
        assert sorted[1].age == '20'
        assert sorted[2].first == 'Raul'
    }
}

class TestPerson implements Comparable {
    public def first, last, age

    public int compareTo(Object o) {
        return "${first} ${last}".compareTo("${o.first} ${o.last}")
    }
}

Other Groovy examples (source code examples)

Here is a short list of links related to this Groovy OrderByTest.groovy source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.