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Groovy example source code file (TransformTestHelperTest.groovy)

This example Groovy source code file (TransformTestHelperTest.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

asttransformation, atomicboolean, atomicboolean, groovytestcase, illegalstateexception, observingtransformation, observingtransformation, sourceunit, the, the, transformation, transformation, transformtesthelper, transformtesthelpertest

The Groovy TransformTestHelperTest.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 org.codehaus.groovy.tools.ast

import java.util.concurrent.atomic.AtomicBoolean
import org.codehaus.groovy.ast.ASTNode
import org.codehaus.groovy.control.CompilePhase
import org.codehaus.groovy.control.SourceUnit
import org.codehaus.groovy.transform.ASTTransformation

/**
 * Unit test that exercises the TransformTestHelper.
 * 
 * @author Hamlet D'Arcy
 */
class TransformTestHelperTest extends GroovyTestCase {

    public void testParseFile() {

        def file = File.createTempFile('TransformTestHelperTest', '.groovy')
        file.deleteOnExit()
        file.text = ' 4+2 '

        def observer = new ObservingTransformation()
        def helper = new TransformTestHelper(observer, CompilePhase.CANONICALIZATION)
        def clazz = helper.parse(file)
        assert observer.wasCalled.get(), "The Transformation was not called"
        assert 6 == clazz.newInstance().run()
    }

    public void testParseString() {

        def observer = new ObservingTransformation()
        def helper = new TransformTestHelper(observer, CompilePhase.CANONICALIZATION)
        def clazz = helper.parse(' 4+2 ')
        assert observer.wasCalled.get(), "The Transformation was not called"
        assert 6 == clazz.newInstance().run()
    }

}

class ObservingTransformation implements ASTTransformation {

    private final AtomicBoolean wasCalled = new AtomicBoolean(false)

    void visit(ASTNode[] astNodes, SourceUnit sourceUnit) {
        if (wasCalled.getAndSet(true)) {
            throw new IllegalStateException("${this.class.simpleName()} cannot be called twice.")
        }
    }
}

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