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Groovy example source code file (ClosureListenerTest.groovy)

This example Groovy source code file (ClosureListenerTest.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

closurelistenertest, closurelistenertest, found, found, groovyswingtestcase, gui, jbutton, jbutton, strangebean, strangebean, swing

The Groovy ClosureListenerTest.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
 *
 *     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

import javax.swing.JButton

/**
 * @version $Revision: 20570 $
 */
class ClosureListenerTest extends GroovySwingTestCase {

    void testAddingAndRemovingAClosureListener() {
        testInEDT {

            def b = new JButton("foo")
            b.actionPerformed = { println("Found ${it}") }

            def size = b.actionListeners.size()
            assert size == 1

            def l = b.actionListeners[0]
            def code = l.hashCode()

            println("listener: ${l} with hashCode code ${code}")

            assert l.toString() != "null"

            assert !l.equals(b)
            assert l.equals(l)

            assert l.hashCode() != 0

            b.removeActionListener(l)

            println(b.actionListeners)

            size = b.actionListeners.size()
            assert size == 0
        }
    }

    void testGettingAListenerProperty() {
        testInEDT {

            def b = new JButton("foo")
            def foo = b.actionPerformed
            assert foo == null
        }
    }

    void testNonStandardListener() {
        testInEDT {
            def myWhat = null
            def myWhere = null

            def strangeBean = new StrangeBean()
            strangeBean.somethingStrangeHappened = { what, where -> myWhat = what; myWhere = where}
            strangeBean.somethingStrangeHappened('?', '!')

            assert myWhat == '?'
            assert myWhere == '!'
        }
    }
}

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