Examples of org.apache.tapestry.services.DataSqueezer

org.apache.tapestry.services.DataSqueezer
Lightweight serialization used to encode values into strings that are stored in query parameters and hidden fields. @author Howard Lewis Ship @since 4.0

    {
        IBinding primaryKeysBinding = getBinding("primaryKeys");
        if (primaryKeysBinding == null)
            return;


        DataSqueezer squeezer = getDataSqueezer();


        int repsCount = stringReps.length;
        List primaryKeys = new ArrayList(repsCount);
        for (int i = 0; i < stringReps.length; i++)
        {
            String rep = stringReps[i];
            if (rep.length() == 0 || rep.charAt(0) != DESC_PRIMARY_KEY)
                continue;
            Object primaryKey = squeezer.unsqueeze(rep.substring(1));
            primaryKeys.add(primaryKey);
        }


        primaryKeysBinding.setObject(primaryKeys);
    }

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     * @return
     */
    protected String getStringRepFromValue(Object value)
    {
        String rep;
        DataSqueezer squeezer = getDataSqueezer();


        // try to extract the primary key from the value
        Object pk = getPrimaryKeyFromValue(value);
        if (pk != null)
            // Primary key was extracted successfully.
            rep = DESC_PRIMARY_KEY + squeezer.squeeze(pk);
        else
            // primary key could not be extracted. squeeze value.
            rep = DESC_VALUE + squeezer.squeeze(value);


        return rep;
    }

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     */
    protected Object getValueFromStringRep(Iterator sourceIterator, Iterator fullSourceIterator,
            Map repToValueMap, String rep)
    {
        Object value = null;
        DataSqueezer squeezer = getDataSqueezer();


        // Check if the string rep is empty. If so, just return the default value.
        if (rep == null || rep.length() == 0)
            return getDefaultValue();


        // If required, find a value with an equivalent string representation and return it
        boolean match = getMatch();
        if (match)
        {
            value = findValueWithStringRep(
                    sourceIterator,
                    fullSourceIterator,
                    repToValueMap,
                    rep,
                    _completeRepSource);
            if (value != null)
                return value;
        }


        // Matching of the string representation was not successful or was disabled.
        // Use the standard approaches to obtain the value from the rep.
        char desc = rep.charAt(0);
        String squeezed = rep.substring(1);
        switch (desc)
        {
            case DESC_VALUE:
                // If the string rep is just the value itself, unsqueeze it
                value = squeezer.unsqueeze(squeezed);
                break;


            case DESC_PRIMARY_KEY:
                // Perform keyExpression match if not already attempted
                if (!match && getKeyExpression() != null)
                    value = findValueWithStringRep(
                            sourceIterator,
                            fullSourceIterator,
                            repToValueMap,
                            rep,
                            _keyExpressionRepSource);


                // If 'converter' is defined, try to perform conversion from primary key to value
                if (value == null)
                {
                    IPrimaryKeyConverter converter = getConverter();
                    if (converter != null)
                    {
                        Object pk = squeezer.unsqueeze(squeezed);
                        value = converter.getValue(pk);
                    }
                }
                break;
        }

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    }


    public void testCustom() throws IOException
    {
        DataSqueezer ds = new DataSqueezerImpl(new DefaultClassResolver(), new ISqueezeAdaptor[]
        { new BHSqueezer() });


        attempt(new BooleanHolder(true), "BT", ds);
        attempt(new BooleanHolder(false), "BF", ds);

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        String stringValue = Long.toHexString(System.currentTimeMillis());


        PropertyUtils.write(visit, "stringValue", stringValue);


        DataSqueezer squeezer = new DataSqueezerImpl(new DefaultClassResolver(visitClassLoader));


        String squeezed = squeezer.squeeze(visit);


        Object outVisit = squeezer.unsqueeze(squeezed);


        // System.out.println("outVisit classloader = " + outVisit.getClass().getClassLoader());


        assertNotNull(outVisit);
        assertTrue("Input and output objects not same.", visit != outVisit);

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    public void test_Rewind()
    {
        IAutocompleteModel model = createModel();
        ValidatableFieldSupport vfs = newMock(ValidatableFieldSupport.class);
        DataSqueezer ds = newMock(DataSqueezer.class);
        
        Autocompleter component = newInstance(Autocompleter.class, 
                new Object[] { "model", model, "validatableFieldSupport", vfs,
            "dataSqueezer", ds});
        
        IRequestCycle cycle = newMock(IRequestCycle.class);
        IForm form = newMock(IForm.class);
        
        IMarkupWriter writer = newWriter();
        
        IValidationDelegate delegate = newDelegate();
        
        expect(cycle.renderStackPush(component)).andReturn(component);
        
        trainGetForm(cycle, form);
        trainWasPrerendered(form, writer, component, false);
        trainGetDelegate(form, delegate);
        
        delegate.setFormComponent(component);
        
        trainGetElementId(form, component, "barney");
        trainIsRewinding(form, true);
        
        trainGetParameter(cycle, "barney", "1");
        
        expect(ds.unsqueeze("1")).andReturn(new Integer(1));
        
        SimpleBean match = new SimpleBean(new Integer(1), null, -1);
        
        try
        {

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    @Test(dataProvider = "renderings")
    public void test_Render(String outcome, Boolean local)
    {           
        IAutocompleteModel model = createModel();
        ValidatableFieldSupport vfs = newMock(ValidatableFieldSupport.class);
        DataSqueezer ds = newMock(DataSqueezer.class);
        ResponseBuilder resp = newMock(ResponseBuilder.class);
        
        IRequestCycle cycle = newMock(IRequestCycle.class);
        IForm form = newMock(IForm.class);
        checkOrder(form, false);
        
        MockDelegate delegate = new MockDelegate();
        
        IEngineService engine = newEngineService();
        ILink link = newLink();
        
        IScript script = newMock(IScript.class);
        
        SimpleBean match = new SimpleBean(new Integer(2), "Simple 2", 200);
        
        Autocompleter component = newInstance(Autocompleter.class, 
                new Object[] { 
            "name", "fred", "model", model, 
            "directService", engine,
            "script", script,
            "validatableFieldSupport", vfs, 
            "value", match,
            "dataSqueezer", ds, "local", local
        });
        
        expect(cycle.renderStackPush(component)).andReturn(component);
        
        expect(form.getName()).andReturn("testform").anyTimes();
        
        form.setFormFieldUpdating(true);
        
        IMarkupWriter writer = newBufferWriter();
        
        DirectServiceParameter dsp = 
            new DirectServiceParameter(component);
        
        trainGetForm(cycle, form);
        trainWasPrerendered(form, writer, component, false);
        
        trainGetDelegate(form, delegate);
        
        delegate.setFormComponent(component);
        
        trainGetElementId(form, component, "fred");
        trainIsRewinding(form, false);
        expect(cycle.isRewinding()).andReturn(false).anyTimes();
        
        delegate.setFormComponent(component);
        
        expect(cycle.getResponseBuilder()).andReturn(resp).anyTimes();
        expect(resp.isDynamic()).andReturn(false).anyTimes();
        
        vfs.renderContributions(component, writer, cycle);
        if (!local.booleanValue()) 
        {
            trainGetLinkCheckIgnoreParameter(engine, cycle, true, dsp, link);        
            trainGetURL(link, "urlstring");
        }
        else 
        {
            expect(ds.squeeze(1)).andReturn("1p");
            expect(ds.squeeze(2)).andReturn("2p");
            expect(ds.squeeze(3)).andReturn("3p");
        }
        // for the default value
        expect(ds.squeeze(2)).andReturn("2p"); 
        
        PageRenderSupport prs = newPageRenderSupport();
        trainGetPageRenderSupport(cycle, prs);
        
        script.execute(eq(component), eq(cycle), eq(prs), isA(Map.class));

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    public void test_Render_JSON()
    {
        IAutocompleteModel model = createModel();
        IRequestCycle cycle = newMock(IRequestCycle.class);
        DataSqueezer ds = newMock(DataSqueezer.class);
        checkOrder(ds, false);
        
        IJSONWriter writer = newBufferJSONWriter();
        
        Autocompleter component = newInstance(Autocompleter.class, new Object[]
        { "name", "fred", "model", model,
            "filter", "l", "dataSqueezer", ds });
        
        expect(ds.squeeze(1)).andReturn("1");
        expect(ds.squeeze(2)).andReturn("2");
        expect(ds.squeeze(3)).andReturn("3");
        
        replay();
        
        component.renderComponent(writer, cycle);

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    }


    public void testCustom() throws IOException
    {
        DataSqueezer ds = new DataSqueezerImpl(new DefaultClassResolver(), new ISqueezeAdaptor[]
        { new BHSqueezer() });


        attempt(new BooleanHolder(true), "BT", ds);
        attempt(new BooleanHolder(false), "BF", ds);

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        String stringValue = Long.toHexString(System.currentTimeMillis());


        PropertyUtils.write(visit, "stringValue", stringValue);


        DataSqueezer squeezer = new DataSqueezerImpl(new DefaultClassResolver(visitClassLoader));


        String squeezed = squeezer.squeeze(visit);


        Object outVisit = squeezer.unsqueeze(squeezed);


        // System.out.println("outVisit classloader = " + outVisit.getClass().getClassLoader());


        assertNotNull(outVisit);
        assertTrue("Input and output objects not same.", visit != outVisit);

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