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Groovy example source code file (ASTTransformationCustomizerTest.groovy)

This example Groovy source code file (ASTTransformationCustomizerTest.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

annotation, asttransformation, asttransformationcustomizer, asttransformationcustomizer, atomicboolean, compilerconfiguration, groovyshell, groovyshell, groovytestcase, log, logger, logging, myclass, myclass, sourceunit, testtransformation, testtransformation

The Groovy ASTTransformationCustomizerTest.groovy source code

/*
 * Copyright 2003-2011 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.control.customizers

import org.codehaus.groovy.control.CompilerConfiguration
import groovy.util.logging.Log
import java.util.logging.Logger
import org.codehaus.groovy.transform.ASTTransformation
import org.codehaus.groovy.transform.GroovyASTTransformation
import org.codehaus.groovy.control.CompilePhase
import java.util.concurrent.atomic.AtomicBoolean
import org.codehaus.groovy.ast.ASTNode
import org.codehaus.groovy.control.SourceUnit
import java.lang.annotation.Retention
import java.lang.annotation.Target
import org.codehaus.groovy.transform.GroovyASTTransformationClass
import java.lang.annotation.ElementType
import java.lang.annotation.RetentionPolicy
import org.codehaus.groovy.ast.ClassNode
import org.objectweb.asm.Opcodes
import org.codehaus.groovy.ast.builder.AstBuilder
import groovy.transform.ConditionalInterrupt

/**
 * Tests the {@link ASTTransformationCustomizer}.
 */
class ASTTransformationCustomizerTest extends GroovyTestCase {
    CompilerConfiguration configuration
    ASTTransformationCustomizer customizer

    void setUp() {
        configuration = new CompilerConfiguration()
    }

    void testLocalTransformation() {
        customizer = new ASTTransformationCustomizer(Log)
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        def result = shell.evaluate("""
            class MyClass {}
            new MyClass()
        """)
        assert result.log.class == Logger
    }

    void testLocalTransformationWithAnnotationParameter() {
        customizer = new ASTTransformationCustomizer(Log)
        customizer.annotationParameters = [value: 'logger']
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        def result = shell.evaluate("""
            class MyClass {}
            new MyClass()
        """)
        assert result.logger.class == Logger
    }

    void testLocalTransformationWithInvalidAnnotationParameter() {
        customizer = new ASTTransformationCustomizer(Log)
        shouldFail(IllegalArgumentException) {
            customizer.annotationParameters = [invalid: 'logger']
        }
    }

    void testLocalTransformationWithClosureAnnotationParameter() {
        // add @Contract({distance = 1 })
        customizer = new ASTTransformationCustomizer(Contract)
        final expression = new AstBuilder().buildFromCode(CompilePhase.CONVERSION) {->
            distance = 1
        }.expression[0]
        customizer.annotationParameters = [value: expression]
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        def result = shell.evaluate("""
            class MyClass {
                int distance
                MyClass() {}
            }
            new MyClass()
        """)
        assert result.distance == 1
    }

    void testLocalTransformationWithClassAnnotationParameter() {
        // add @ConditionalInterrupt(value={ true }, thrown=SecurityException)
        final expression = new AstBuilder().buildFromCode(CompilePhase.CONVERSION) {->
            true
        }.expression[0]
        customizer = new ASTTransformationCustomizer(ConditionalInterrupt, value:expression, thrown:SecurityException)
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        shouldFail(SecurityException) {
            shell.evaluate("""
                class MyClass {
                    void doIt() { }
                }
                new MyClass().doIt()
            """)
        }
    }

    void testGlobalTransformation() {
        final TestTransformation transformation = new TestTransformation()
        customizer = new ASTTransformationCustomizer(transformation)
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        assert shell.evaluate('true')
        assert transformation.applied.get()
    }

    void testGlobalTransformation2() {
        final TestTransformation transformation = new TestTransformation()
        customizer = new ASTTransformationCustomizer(transformation)
        configuration.addCompilationCustomizers(customizer)
        def shell = new GroovyShell(configuration)
        assert shell.evaluate("""
            class A {}
            class B {}
            true
        """)
        assert transformation.applied.get()
    }

    @GroovyASTTransformation(phase=CompilePhase.CONVERSION)
    private static class TestTransformation implements ASTTransformation {

        private AtomicBoolean applied = new AtomicBoolean(false)

        void visit(ASTNode[] nodes, SourceUnit source) {
            if (applied.getAndSet(true)) {
                throw new Exception("Global AST transformation should only be applied once")
            }
        }
        
    }

}

@Retention(RetentionPolicy.SOURCE)
@Target([ElementType.TYPE])
@GroovyASTTransformationClass("org.codehaus.groovy.control.customizers.ContractAnnotation")
protected @interface Contract {
    Class value();
}

@GroovyASTTransformation(phase=CompilePhase.CONVERSION)
protected class ContractAnnotation implements ASTTransformation, Opcodes {
    void visit(ASTNode[] nodes, SourceUnit source) {
        def node = nodes[0]
        def member = node.getMember("value")
        ((ClassNode)nodes[1]).getDeclaredConstructors()[0].code = member.code
    }

}

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