Examples with JexlUberspect org.apache.commons.jexl3.introspection.JexlUberspect used on opensource projects

Example 1 with JexlUberspect

use of org.apache.commons.jexl3.introspection.JexlUberspect in project commons-jexl by apache.

the class Operators method contains.

/**
 * The 'match'/'in' operator implementation.
 * <p>
 * Note that 'x in y' or 'x matches y' means 'y contains x' ;
 * the JEXL operator arguments order syntax is the reverse of this method call.
 * </p>
 * @param node  the node
 * @param op    the calling operator, =~ or !~
 * @param right the left operand
 * @param left  the right operand
 * @return true if left matches right, false otherwise
 */
protected boolean contains(final JexlNode node, final String op, final Object left, final Object right) {
    final JexlArithmetic arithmetic = interpreter.arithmetic;
    final JexlUberspect uberspect = interpreter.uberspect;
    try {
        // try operator overload
        final Object result = tryOverload(node, JexlOperator.CONTAINS, left, right);
        if (result instanceof Boolean) {
            return (Boolean) result;
        }
        // use arithmetic / pattern matching ?
        final Boolean matched = arithmetic.contains(left, right);
        if (matched != null) {
            return matched;
        }
        // try a contains method (duck type set)
        try {
            final Object[] argv = { right };
            JexlMethod vm = uberspect.getMethod(left, "contains", argv);
            if (returnsBoolean(vm)) {
                return (Boolean) vm.invoke(left, argv);
            }
            if (arithmetic.narrowArguments(argv)) {
                vm = uberspect.getMethod(left, "contains", argv);
                if (returnsBoolean(vm)) {
                    return (Boolean) vm.invoke(left, argv);
                }
            }
        } catch (final Exception e) {
            throw new JexlException(node, op + " error", e);
        }
        // defaults to equal
        return arithmetic.equals(left, right);
    } catch (final ArithmeticException xrt) {
        throw new JexlException(node, op + " error", xrt);
    }
}

Example 2 with JexlUberspect

use of org.apache.commons.jexl3.introspection.JexlUberspect in project commons-jexl by apache.

the class ReferenceUberspect method discoverFind.

/**
 * Discovers a an optional getter.
 * <p>The method to be found should be named "{find}{P,p}property and return an Optional&lt;?&gt;.</p>
 *
 * @param is the uberspector
 * @param clazz the class to find the get method from
 * @param property the property name to find
 * @return the executor if found, null otherwise
 */
private static JexlPropertyGet discoverFind(final JexlUberspect is, final Class<?> clazz, final String property) {
    if (property == null || property.isEmpty()) {
        return null;
    }
    // this is gross and linear, but it keeps it straightforward.
    JexlMethod method;
    // "find".length() == 4
    final int start = 4;
    // start with get<Property>
    final StringBuilder sb = new StringBuilder("find");
    sb.append(property);
    // uppercase nth char
    final char c = sb.charAt(start);
    sb.setCharAt(start, Character.toUpperCase(c));
    method = is.getMethod(clazz, sb.toString(), EMPTY_PARAMS);
    // lowercase nth char
    if (method == null) {
        sb.setCharAt(start, Character.toLowerCase(c));
        method = is.getMethod(clazz, sb.toString(), EMPTY_PARAMS);
    }
    if (method != null && Optional.class.equals(method.getReturnType())) {
        final JexlMethod getter = method;
        final String name = sb.toString();
        return new JexlPropertyGet() {

            @Override
            public Object invoke(Object obj) throws Exception {
                return getter.invoke(obj);
            }

            @Override
            public Object tryInvoke(Object obj, Object key) throws JexlException.TryFailed {
                return !Objects.equals(property, key) ? JexlEngine.TRY_FAILED : getter.tryInvoke(name, obj);
            }

            @Override
            public boolean tryFailed(Object rval) {
                return rval == JexlEngine.TRY_FAILED;
            }

            @Override
            public boolean isCacheable() {
                return getter.isCacheable();
            }
        };
    }
    return null;
}

Example 3 with JexlUberspect

use of org.apache.commons.jexl3.introspection.JexlUberspect in project commons-jexl by apache.

the class StrategyTest method testRawResolvers.

@Test
public void testRawResolvers() throws Exception {
    final Object map = new HashMap<String, Object>();
    final JexlEngine jexl = new JexlBuilder().create();
    final JexlUberspect uberspect = jexl.getUberspect();
    final JexlUberspect.PropertyResolver rfieldp = JexlUberspect.JexlResolver.FIELD;
    final JexlPropertyGet fget = rfieldp.getPropertyGet(uberspect, map, "key");
    Assert.assertNull(fget);
    final JexlPropertySet fset = rfieldp.getPropertySet(uberspect, map, "key", "value");
    Assert.assertNull(fset);
    final JexlUberspect.PropertyResolver rmap = JexlUberspect.JexlResolver.MAP;
    final JexlPropertyGet mget = rmap.getPropertyGet(uberspect, map, "key");
    Assert.assertNotNull(mget);
    final JexlPropertySet mset = rmap.getPropertySet(uberspect, map, "key", "value");
    Assert.assertNotNull(mset);
}

Example 4 with JexlUberspect

use of org.apache.commons.jexl3.introspection.JexlUberspect in project commons-jexl by apache.

the class MethodTest method testTryFailed.

@Test
public void testTryFailed() throws Exception {
    // JEXL-257
    final Functor func = new Functor();
    final JexlContext ctxt = new MapContext();
    ctxt.set("func", func);
    Object result;
    final JexlUberspect uber = JEXL.getUberspect();
    // tryInvoke
    final JexlMethod method = uber.getMethod(func, "over", "foo", 42);
    Assert.assertNotNull(method);
    // tryInvoke succeeds
    result = method.tryInvoke("over", func, "foo", 42);
    Assert.assertEquals("foo + 42", result);
    // tryInvoke fails
    func.setKill(true);
    try {
        /*result = */
        method.tryInvoke("over", func, "foo", 42);
        Assert.fail("should throw TryFailed");
    } catch (final JexlException.TryFailed xfail) {
        Assert.assertEquals(UnsupportedOperationException.class, xfail.getCause().getClass());
    }
    func.setKill(false);
    final JexlPropertySet setter = uber.getPropertySet(func, "under", "42");
    result = setter.tryInvoke(func, "under", "42");
    Assert.assertFalse(setter.tryFailed(result));
    Assert.assertEquals("42", result);
    final JexlPropertyGet getter = uber.getPropertyGet(func, "under");
    result = getter.tryInvoke(func, "under");
    Assert.assertFalse(getter.tryFailed(result));
    Assert.assertEquals("42", result);
    func.setKill(true);
    try {
        /*result = */
        setter.tryInvoke(func, "under", "42");
        Assert.fail("should throw TryFailed");
    } catch (final JexlException.TryFailed xfail) {
        Assert.assertEquals(UnsupportedOperationException.class, xfail.getCause().getClass());
    }
    func.setKill(false);
    result = setter.tryInvoke(func, "under", "-42");
    Assert.assertEquals("-42", result);
    func.setKill(true);
    try {
        /*result = */
        getter.tryInvoke(func, "under");
        Assert.fail("should throw TryFailed");
    } catch (final JexlException.TryFailed xfail) {
        Assert.assertEquals(UnsupportedOperationException.class, xfail.getCause().getClass());
    }
    func.setKill(false);
    result = getter.tryInvoke(func, "under");
    Assert.assertFalse(getter.tryFailed(result));
    Assert.assertEquals("-42", result);
}

Example 5 with JexlUberspect

use of org.apache.commons.jexl3.introspection.JexlUberspect in project commons-jexl by apache.

the class Operators method empty.

/**
 * Check for emptyness of various types: Collection, Array, Map, String, and anything that has a boolean isEmpty()
 * method.
 * <p>Note that the result may not be a boolean.
 *
 * @param node   the node holding the object
 * @param object the object to check the emptyness of
 * @return the evaluation result
 */
protected Object empty(final JexlNode node, final Object object) {
    if (object == null) {
        return true;
    }
    Object result = tryOverload(node, JexlOperator.EMPTY, object);
    if (result != JexlEngine.TRY_FAILED) {
        return result;
    }
    final JexlArithmetic arithmetic = interpreter.arithmetic;
    result = arithmetic.isEmpty(object, null);
    if (result == null) {
        final JexlUberspect uberspect = interpreter.uberspect;
        result = false;
        // check if there is an isEmpty method on the object that returns a
        // boolean and if so, just use it
        final JexlMethod vm = uberspect.getMethod(object, "isEmpty", Interpreter.EMPTY_PARAMS);
        if (returnsBoolean(vm)) {
            try {
                result = vm.invoke(object, Interpreter.EMPTY_PARAMS);
            } catch (final Exception xany) {
                interpreter.operatorError(node, JexlOperator.EMPTY, xany);
            }
        }
    }
    return !(result instanceof Boolean) || (Boolean) result;
}