Examples of org.apache.tapestry5.plastic.InstructionBuilder

org.apache.tapestry5.plastic.InstructionBuilder
Simplifies the generation of method instructions for a particular method (or constructor), allowing bytecode to be created with a friendlier API that focuses on Java type names (names as they would appear in Java source) rather than JVM descriptors or internal names. In some limited cases, types may be specified as Java Class instances as well. In addition, there is good support for primitive type boxing and unboxing.
Most methods return the same instance of InstructionBuilder, allowing for a "fluid" API.
More complex functionality, such as {@linkplain #startTryCatch(TryCatchCallback) try/catch blocks}, is more like a DSL (domain specific language), and is based on callbacks. This looks better in Groovy and will be more reasonable once JDK 1.8 closures are available; in the meantime, it means some deeply nested inner classes, but helps ensure that correct bytecode is generated and helps to limit the amount of bookkeeping is necessary on the part of code using InstructionBuilder.

    @Test
    public void missing_field_validator_constraint() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        ComponentResources resources = mockComponentResources();
        Messages containerMessages = mockMessages();
        FormSupport fs = mockFormSupport();

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    @Test
    public void single_validator_via_specification() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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    public void multiple_validators_via_specification() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator required = mockValidator();
        Validator minLength = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter requiredFormatter = mockMessageFormatter();
        MessageFormatter minLengthFormatter = mockMessageFormatter();
        Object inputValue = "input value";

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    @Test
    public void validator_with_constraint() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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        }


        // Let subclasses do more.
        configure(config);


        renderSupport.addInit("autocompleter", new JSONArray(id, menuId, link.toAbsoluteURI(), config));
    }

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        "class", "t-autocomplete-menu");
        writer.end();


        Link link = resources.createEventLink(EVENT_NAME);


        JSONObject config = new JSONObject();
        config.put("paramName", PARAM_NAME);
        config.put("indicator", loaderId);


        if (resources.isBound("minChars"))
            config.put("minChars", minChars);


        if (resources.isBound("frequency"))
            config.put("frequency", frequency);


        if (resources.isBound("tokens"))
        {
            for (int i = 0; i < tokens.length(); i++)
            {
                config.accumulate("tokens", tokens.substring(i, i + 1));
            }
        }


        // Let subclasses do more.
        configure(config);

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        newBuilder(methodDescription, methodNode).returnDefaultValue();
    }


    private void createOverrideOfBaseClassImpl(MethodDescription methodDescription, MethodNode methodNode)
    {
        InstructionBuilder builder = newBuilder(methodDescription, methodNode);


        builder.loadThis();
        builder.loadArguments();
        builder.invokeSpecial(superClassName, methodDescription);
        builder.returnResult();
    }

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    private void implementConstructor(ClassNode shimClassNode)
    {
        MethodNode mn = new MethodNode(ACC_PUBLIC, CONSTRUCTOR_NAME, NOTHING_TO_VOID, null, null);


        InstructionBuilder builder = newBuilder(mn);


        builder.loadThis().invokeConstructor(PlasticClassHandleShim.class).returnResult();


        shimClassNode.methods.add(mn);


    }

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    private void implementShimGet(ClassNode shimClassNode)
    {
        MethodNode mn = new MethodNode(ACC_PUBLIC, "get", OBJECT_INT_TO_OBJECT, null, null);


        InstructionBuilder builder = newBuilder(mn);


        // Arg 0 is the target instance
        // Arg 1 is the index


        builder.loadArgument(0).checkcast(className);
        builder.loadArgument(1);


        builder.startSwitch(0, nextFieldIndex - 1, new SwitchCallback()
        {
            public void doSwitch(SwitchBlock block)
            {
                for (PlasticFieldImpl f : shimFields)
                {

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    private void implementShimSet(ClassNode shimClassNode)
    {
        MethodNode mn = new MethodNode(ACC_PUBLIC, "set", OBJECT_INT_OBJECT_TO_VOID, null, null);


        InstructionBuilder builder = newBuilder(mn);


        // Arg 0 is the target instance
        // Arg 1 is the index
        // Arg 2 is the new value


        builder.loadArgument(0).checkcast(className);
        builder.loadArgument(2);


        builder.loadArgument(1);


        builder.startSwitch(0, nextFieldIndex - 1, new SwitchCallback()
        {
            public void doSwitch(SwitchBlock block)
            {
                for (PlasticFieldImpl f : shimFields)
                {
                    f.extendShimSet(block);
                }
            }
        });


        builder.returnResult();


        shimClassNode.methods.add(mn);
    }

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