Examples of org.apache.hivemind.service.MethodSignature

org.apache.hivemind.service.MethodSignature
A representation of a {@link java.lang.reflect.Method}, identifying the name, return type, parameter types and exception types. Actual Method objects are tied to a particular class, and don't compare well with other otherwise identical Methods from other classes or interface; MethodSignatures are distinct from classes and compare well.
Because the intended purpose is to compare methods from interfaces (which are always public and abstract) we don't bother to actually track the modifiers. In addition, at this time, MethodSignature does not distinguish between instance and static methods. @author Howard Lewis Ship

        cf.addConstructor(new Class[]
        { int.class }, null, "{ _intValue = $1; }");


        cf.addMethod(
                Modifier.PUBLIC,
                new MethodSignature(int.class, "getIntValue", null, null),
                "return _intValue;");


        Class targetClass = cf.createClass();
        Constructor c = targetClass.getConstructors()[0];

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    {
        ClassFab cf = newClassFab("SimpleService", Object.class);


        cf.addInterface(SimpleService.class);


        cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "add", new Class[]
        { int.class, int.class }, null), "return $1 + $2;");


        Class targetClass = cf.createClass();


        SimpleService s = (SimpleService) targetClass.newInstance();

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        try
        {
            cf.addMethod(
                    Modifier.PUBLIC,
                    new MethodSignature(void.class, "run", null, null),
                    "fail;");
        }
        catch (ApplicationRuntimeException ex)
        {
            assertExceptionSubstring(ex, "Unable to add method void run() to class BadMethodBody:");

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    public void testGetMethodFab() throws Exception
    {
        ClassFab cf = newClassFab("GetMethodFab", Object.class);


        MethodSignature s = new MethodSignature(void.class, "run", null, null);
        MethodFab mf = cf.addMethod(Modifier.PUBLIC, s, null);


        assertSame(mf, cf.getMethodFab(s));


        assertNull(cf.getMethodFab(new MethodSignature(void.class, "skip", null, null)));
    }

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    public void testExtendMethod() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethod", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 1;");


        mf.extend("return 2 * $_;", false);


        Object bean = cf.createClass().newInstance();

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    public void testExtendMethodAlterReturn() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethodAlterReturn", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 2;");


        mf.extend("$_ = 3 * $_;", false);


        Object bean = cf.createClass().newInstance();

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    public void testExtendMethodFailure() throws Exception
    {
        ClassFab cf = newClassFab("ExtendMethodFailure", Object.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(int.class, "getValue",
                null, null), "return 1;");


        try
        {
            mf.extend("$_ =", true);

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    public void testDupeMethodAdd() throws Exception
    {
        ClassFab cf = newClassFab("DupeMethodAdd", Object.class);


        cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "foo", null, null), "{}");


        try
        {
            cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "foo", null, null), "{}");
            unreachable();
        }
        catch (ApplicationRuntimeException ex)
        {
            assertEquals("Attempt to redefine method void foo() of class DupeMethodAdd.", ex

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    {
        ClassFab cf = newClassFab("Fail", Object.class);


        cf.addInterface(FailService.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "fail", null,
                null), "throw new java.lang.RuntimeException(\"Ouch!\");");


        mf.addCatch(RuntimeException.class, "throw new java.io.IOException($e.getMessage());");


        Class targetClass = cf.createClass();

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    {
        ClassFab cf = newClassFab("BadCatch", Object.class);


        cf.addInterface(Runnable.class);


        MethodFab mf = cf.addMethod(Modifier.PUBLIC, new MethodSignature(void.class, "run", null,
                null), "return;");


        try
        {
            mf.addCatch(RuntimeException.class, "woops!");

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