Examples of org.apache.commons.jxpath.Function

org.apache.commons.jxpath.Function
Extension function interface. Extension functions are grouped into {@link Functions Functions} objects, which are installed onJXPathContexts using the {@link JXPathContext#setFunctions JXPathContext.setFunctions()}call.
The Function interface can be implemented directly. However, most of the time JXPath's built-in implementations should suffice. See {@link ClassFunctions ClassFunctions} and {@link PackageFunctions PackageFunctions}. @author Dmitri Plotnikov @version $Revision: 1.5 $ $Date: 2003/03/11 00:59:12 $


    public Function getFunction(QName functionName, Object[] parameters) {
        String namespace = functionName.getPrefix();
        String name = functionName.getName();
        JXPathContext funcCtx = this;
        Function func = null;
        Functions funcs;
        while (funcCtx != null) {
            funcs = funcCtx.getFunctions();
            if (funcs != null) {
                func = funcs.getFunction(namespace, name, parameters);

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            for (int i = 0; i < args.length; i++) {
                parameters[i] = convert(args[i].compute(context));
            }
        }


        Function function =
            context.getRootContext().getFunction(functionName, parameters);
        if (function == null) {
            throw new JXPathException(
                "No such function: "
                    + functionName
                    + Arrays.asList(parameters));
        }


        return function.invoke(context, parameters);
    }

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     */
    public Function getFunction(QName functionName, Object[] parameters) {
        String namespace = functionName.getPrefix();
        String name = functionName.getName();
        JXPathContext funcCtx = this;
        Function func = null;
        Functions funcs;
        while (funcCtx != null) {
            funcs = funcCtx.getFunctions();
            if (funcs != null) {
                func = funcs.getFunction(namespace, name, parameters);

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            for (int i = 0; i < args.length; i++) {
                parameters[i] = convert(args[i].compute(context));
            }
        }


        Function function =
            context.getRootContext().getFunction(functionName, parameters);
        if (function == null) {
            throw new JXPathFunctionNotFoundException("No such function: "
                    + functionName + Arrays.asList(parameters));
        }
        Object result = function.invoke(context, parameters);
        return result instanceof NodeSet ? new NodeSetContext(context,
                (NodeSet) result) : result;
    }

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            for (int i = 0; i < args.length; i++){
                Object param = args[i].compute(context);
                parameters[i] = param;
            }
        }
        Function function = context.getRootContext().getFunction(functionName, parameters);
        if (function == null){
            throw new JXPathException("No such function: " + functionName +
                 Arrays.asList(parameters));
        }


        return function.invoke(context, parameters);
    }

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        functions = new ClassFunctions(TestFunctions.class, "test");
    }


    public void testConstructorLookup() {
        Object[] args = new Object[] { new Integer(1), "x" };
        Function func = functions.getFunction("test", "new", args);


        assertEquals(
            "test:new(1, x)",
            func.invoke(new Context(null), args).toString(),
            "foo=1; bar=x");
    }

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            "foo=1; bar=x");
    }


    public void testConstructorLookupWithExpressionContext() {
        Object[] args = new Object[] { "baz" };
        Function func = functions.getFunction("test", "new", args);
        assertEquals(
            "test:new('baz')",
            func.invoke(new Context(new Integer(1)), args).toString(),
            "foo=1; bar=baz");
    }

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            "foo=1; bar=baz");
    }


    public void testStaticMethodLookup() {
        Object[] args = new Object[] { new Integer(1), "x" };
        Function func = functions.getFunction("test", "build", args);
        assertEquals(
            "test:build(1, x)",
            func.invoke(new Context(null), args).toString(),
            "foo=1; bar=x");
    }

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            "foo=1; bar=x");
    }


    public void testStaticMethodLookupWithConversion() {
        Object[] args = new Object[] { "7", new Integer(1)};
        Function func = functions.getFunction("test", "build", args);
        assertEquals(
            "test:build('7', 1)",
            func.invoke(new Context(null), args).toString(),
            "foo=7; bar=1");
    }

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            "foo=7; bar=1");
    }


    public void testMethodLookup() {
        Object[] args = new Object[] { new TestFunctions()};
        Function func = functions.getFunction("test", "getFoo", args);
        assertEquals(
            "test:getFoo($test, 1, x)",
            func.invoke(new Context(null), args).toString(),
            "0");
    }

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