Groovy example source code file (TransformTestHelperTest.groovy)

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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.")
        }
    }
}