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Groovy example source code file (ClassCompletionVerifierTest.java)

This example Groovy source code file (ClassCompletionVerifierTest.java) 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

acc_abstract, acc_final, acc_interface, acc_public, classnode, classnode, dodgyclass, exception, io, methodnode, methodnode, string, string, the, the

The Groovy ClassCompletionVerifierTest.java 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.classgen;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.MethodNode;
import org.codehaus.groovy.ast.Parameter;
import org.codehaus.groovy.control.SourceUnit;

import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * @author Paul King
 */
public class ClassCompletionVerifierTest extends TestSupport {
    private SourceUnit source;
    private ClassCompletionVerifier verifier;
    private static final String ABSTRACT_FINAL_CLASS = "AbstractFinalClass";
    private static final String FINAL_INTERFACE = "FinalInterface";
    private static final String EXPECTED_CLASS_MODIFIER_ERROR_MESSAGE =
            "The class '" + ABSTRACT_FINAL_CLASS + "' must not be both final and abstract.";
    private static final String EXPECTED_INTERFACE_MODIFIER_ERROR_MESSAGE =
            "The interface '" + FINAL_INTERFACE + "' must not be final. It is by definition abstract.";
    private static final String EXPECTED_INTERFACE_FINAL_METHOD_ERROR_MESSAGE =
            "The method 'java.lang.Object xxx()' from interface 'zzz' must not be final. It is by definition abstract.";
    private static final String EXPECTED_INTERFACE_STATIC_METHOD_ERROR_MESSAGE =
            "The method 'java.lang.Object yyy()' from interface 'zzz' must not be static. Only fields may be static in an interface.";
    private static final String EXPECTED_TRANSIENT_CLASS_ERROR_MESSAGE =
            "The class 'DodgyClass' has an incorrect modifier transient.";
    // can't check synchronized here as it doubles up with ACC_SUPER
    //private static final String EXPECTED_SYNCHRONIZED_CLASS_ERROR_MESSAGE =
    //        "The class 'DodgyClass' has an incorrect modifier synchronized.";
    private static final String EXPECTED_NATIVE_CLASS_ERROR_MESSAGE =
            "The class 'DodgyClass' has an incorrect modifier native.";
    private static final String EXPECTED_VOLATILE_CLASS_ERROR_MESSAGE =
            "The class 'DodgyClass' has an incorrect modifier volatile.";
    private static final String EXPECTED_DUPLICATE_METHOD_ERROR_CLASS_MESSAGE =
            "Repetitive method name/signature for method 'java.lang.Object xxx()' in class 'zzz'.";
    private static final String EXPECTED_DUPLICATE_METHOD_ERROR_INTERFACE_MESSAGE =
            "Repetitive method name/signature for method 'java.lang.Object xxx(java.lang.String)' in interface 'zzz'.";
    // can't check volatile here as it doubles up with bridge
    //private static final String EXPECTED_VOLATILE_METHOD_ERROR_MESSAGE =
    //        "The method 'java.lang.Object vo()' has an incorrect modifier volatile.";
    private static final String EXPECTED_STRICT_METHOD_ERROR_MESSAGE =
            "The method 'java.lang.Object st()' has an incorrect modifier strictfp.";
    private static final String EXPECTED_NATIVE_METHOD_ERROR_MESSAGE =
            "The method 'java.lang.Object na()' has an incorrect modifier native.";
    private static final String EXPECTED_SYNCHRONIZED_METHOD_ERROR_MESSAGE =
            "The method 'java.lang.Object sy()' has an incorrect modifier synchronized.";
    private static final String EXPECTED_PROTECTED_FIELD_ERROR_MESSAGE =
            "The field 'prof' is not 'public static final' but is defined in interface 'zzz'.";
    private static final String EXPECTED_PRIVATE_FIELD_ERROR_MESSAGE =
            "The field 'prif' is not 'public static final' but is defined in interface 'zzz'.";
    private static final String EXPECTED_PROTECTED_METHOD_ERROR_MESSAGE =
            "Method 'prom' is protected but should be public in interface 'zzz'.";
    private static final String EXPECTED_PRIVATE_METHOD_ERROR_MESSAGE =
            "Method 'prim' is private but should be public in interface 'zzz'.";

    protected void setUp() throws Exception {
        super.setUp();
        source = SourceUnit.create("dummy.groovy", "");
        verifier = new ClassCompletionVerifier(source);
    }

    public void testDetectsFinalAbstractClass() throws Exception {
        checkVisitErrors("FinalClass", ACC_FINAL, false);
        checkVisitErrors("AbstractClass", ACC_ABSTRACT, false);
        checkVisitErrors(ABSTRACT_FINAL_CLASS, ACC_ABSTRACT | ACC_FINAL, true);
        checkErrorMessage(EXPECTED_CLASS_MODIFIER_ERROR_MESSAGE);
    }

    public void testDetectsDuplicateMethodsForClassNoParams() throws Exception {
        checkDetectsDuplicateMethods(0, EXPECTED_DUPLICATE_METHOD_ERROR_CLASS_MESSAGE, Parameter.EMPTY_ARRAY);
    }

    public void testDetectsDuplicateMethodsForInterfaceOneParam() throws Exception {
        Parameter[] stringParam = {new Parameter(ClassHelper.STRING_TYPE, "x")};
        checkDetectsDuplicateMethods(ACC_INTERFACE, EXPECTED_DUPLICATE_METHOD_ERROR_INTERFACE_MESSAGE, stringParam);
    }

    private void checkDetectsDuplicateMethods(int modifiers, String expectedErrorMessage, Parameter[] params) {
        ClassNode node = new ClassNode("zzz", modifiers, ClassHelper.OBJECT_TYPE);
        node.addMethod(new MethodNode("xxx", ACC_PUBLIC, ClassHelper.OBJECT_TYPE, params, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("xxx", ACC_PUBLIC, ClassHelper.OBJECT_TYPE, params, ClassNode.EMPTY_ARRAY, null));
        verifier.visitClass(node);
        checkErrorCount(2);
        checkErrorMessage(expectedErrorMessage);
    }

    public void testDetectsIncorrectOtherModifier() throws Exception {
        // can't check synchronized here as it doubles up with ACC_SUPER
        checkVisitErrors("DodgyClass", ACC_TRANSIENT | ACC_VOLATILE | ACC_NATIVE, true);
        checkErrorMessage(EXPECTED_TRANSIENT_CLASS_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_VOLATILE_CLASS_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_NATIVE_CLASS_ERROR_MESSAGE);
    }

    public void testDetectsFinalAbstractInterface() throws Exception {
        checkVisitErrors(FINAL_INTERFACE, ACC_ABSTRACT | ACC_FINAL | ACC_INTERFACE, true);
        checkErrorMessage(EXPECTED_INTERFACE_MODIFIER_ERROR_MESSAGE);
    }

    public void testDetectsFinalAndStaticMethodsInInterface() throws Exception {
        ClassNode node = new ClassNode("zzz", ACC_ABSTRACT | ACC_INTERFACE, ClassHelper.OBJECT_TYPE);
        node.addMethod(new MethodNode("xxx", ACC_PUBLIC | ACC_FINAL, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("yyy", ACC_PUBLIC | ACC_STATIC, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        addDummyConstructor(node);
        verifier.visitClass(node);
        checkErrorCount(2);
        checkErrorMessage(EXPECTED_INTERFACE_FINAL_METHOD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_INTERFACE_STATIC_METHOD_ERROR_MESSAGE);
    }

    public void testDetectsIncorrectMethodModifiersInInterface() throws Exception {
        // can't check volatile here as it doubles up with bridge
        ClassNode node = new ClassNode("zzz", ACC_ABSTRACT | ACC_INTERFACE, ClassHelper.OBJECT_TYPE);
        node.addMethod(new MethodNode("st", ACC_STRICT, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("na", ACC_NATIVE, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("sy", ACC_SYNCHRONIZED, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        addDummyConstructor(node);
        verifier.visitClass(node);
        checkErrorCount(3);
        checkErrorMessage(EXPECTED_STRICT_METHOD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_NATIVE_METHOD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_SYNCHRONIZED_METHOD_ERROR_MESSAGE);
    }

    public void testDetectsIncorrectMemberVisibilityInInterface() throws Exception {
        ClassNode node = new ClassNode("zzz", ACC_ABSTRACT | ACC_INTERFACE, ClassHelper.OBJECT_TYPE);
        node.addMethod(new MethodNode("prim", ACC_PRIVATE, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("prom", ACC_PROTECTED, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addField("prif", ACC_PRIVATE, ClassHelper.OBJECT_TYPE, null);
        node.addField("prof", ACC_PROTECTED, ClassHelper.OBJECT_TYPE, null);
        addDummyConstructor(node);
        verifier.visitClass(node);
        checkErrorCount(4);
        checkErrorMessage(EXPECTED_PROTECTED_FIELD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_PRIVATE_FIELD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_PROTECTED_METHOD_ERROR_MESSAGE);
        checkErrorMessage(EXPECTED_PRIVATE_METHOD_ERROR_MESSAGE);
    }

    public void testDetectsCorrectMethodModifiersInClass() throws Exception {
        // can't check volatile here as it doubles up with bridge
        ClassNode node = new ClassNode("zzz", ACC_PUBLIC, ClassHelper.OBJECT_TYPE);
        node.addMethod(new MethodNode("st", ACC_STRICT, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("na", ACC_NATIVE, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        node.addMethod(new MethodNode("sy", ACC_SYNCHRONIZED, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
        addDummyConstructor(node);
        verifier.visitClass(node);
        checkErrorCount(0);
    }

    private void addDummyConstructor(ClassNode node) {
        // constructors should not be treated as errors (they have no real meaning for interfaces anyway)
        node.addMethod(new MethodNode("<clinit>", ACC_PUBLIC | ACC_STATIC, ClassHelper.OBJECT_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, null));
    }

    private void checkErrorCount(int count) {
        assertEquals(buildErrorMessage(count), count, source.getErrorCollector().getErrorCount());
    }

    private String buildErrorMessage(int count) {
        StringBuilder sb = new StringBuilder();
        sb.append("Expected ").append(count);
        sb.append(" error messages but found ");
        sb.append(source.getErrorCollector().getErrorCount()).append(":\n");
        sb.append(flattenErrorMessage());
        return sb.toString();
    }

    private void checkVisitErrors(String name, int modifiers, boolean expectedToFail) {
        ClassNode node = new ClassNode(name, modifiers, ClassHelper.OBJECT_TYPE);
        verifier.visitClass(node);
        assertTrue(source.getErrorCollector().hasErrors() == expectedToFail);
    }

    private void checkErrorMessage(String expectedErrorMessage) {
        assertTrue("Expected an error message but none found.", source.getErrorCollector().hasErrors());
        assertTrue("Expected message to contain <" + expectedErrorMessage +
                "> but was <" + flattenErrorMessage() + ">.",
                flattenErrorMessage().contains(expectedErrorMessage));
    }

    private String flattenErrorMessage() {
        StringWriter stringWriter = new StringWriter();
        PrintWriter writer = new PrintWriter(stringWriter, true);
        for (int i = source.getErrorCollector().getErrorCount() - 1; i >= 0; i--) {
            source.getErrorCollector().getError(i).write(writer);
        }
        writer.close();
        return stringWriter.toString();
    }
}

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