Groovy example source code file (GeneratorTest.groovy)

This example Groovy source code file (GeneratorTest.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

a, a, abc, abc, b, b, c, c, generatortest, groovytestcase

The Groovy GeneratorTest.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

class GeneratorTest extends GroovyTestCase {

    void testGenerator() {
        def x = this.&sampleGenerator
        //System.out.println("x: " + x)

        def result = ''
        for (i in x) {
            result = result + i
        }

        assert result == "ABC"
    }

    void testFindAll() {
        def x = this.&sampleGenerator

        def value = x.findAll { item -> return item == "C" }
        assert value == ["C"]

        value = x.findAll { item -> return item != "B" }
        assert value == ["A", "C"]
    }

    void testEach() {
        def x = this.&sampleGenerator

        def value = x.each { println(it) }
    }

    void testMissingThisBug() {
        def result = ''
        for (i in this.&sampleGenerator) {
            result = result + i
        }

        assert result == "ABC"
    }

    void sampleGenerator(closure) {
        // kinda like yield statements
        closure.call("A")
        closure.call("B")
        closure.call("C")
    }
}