Examples of java.beans.Expression

java.beans.Expression
An Expression object represents a primitive expression in which a single method is applied to a target and a set of arguments to return a result - as in "a.getFoo()".
In addition to the properties of the super class, the Expression object provides a value which is the object returned when this expression is evaluated. The return value is typically not provided by the caller and is instead computed by dynamically finding the method and invoking it when the first call to getValue is made. @see #getValue @see #setValue @since 1.4 @version 1.3 11/15/00 @author Philip Milne

    public void testConstructor_Value_ArrayTarget() throws Exception {
        Integer val = new Integer(69);
        Object target = new Integer[] { val };
        Object arg = new Integer(0);
        Object[] oa = new Object[] { arg };
        Expression t = new Expression(val, target, "get", oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("get", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertSame(arg, t.getArguments()[0]);


        assertEquals("Integer=IntegerArray.get(Integer);", t.toString());
    }

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     */
    public void testConstructor_Value_NullMethodName() throws Exception {
        Object val = new Object();
        Object target = new Object();
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(val, target, null, oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame(null, t.getMethodName());
        assertSame(oa, t.getArguments());


        assertEquals("Object=Object.null(Object);", t.toString());
    }

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     */
    public void testConstructor_Value_NewMethodName() throws Exception {
        Object val = new Object();
        Object target = new Object();
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(val, target, "new", oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("new", t.getMethodName());
        assertSame(oa, t.getArguments());


        assertEquals("Object=Object.new(Object);", t.toString());
    }

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     */
    public void testConstructor_Value_EmptyMethodName() throws Exception {
        Object val = new Object();
        Object target = new Object();
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(val, target, "", oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("", t.getMethodName());
        assertSame(oa, t.getArguments());


        assertEquals("Object=Object.(Object);", t.toString());
    }

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     * Test the constructor(value, ...) with null arguments.
     */
    public void testConstructor_Value_NullArguments() throws Exception {
        Object val = new Object();
        Object target = new Object();
        Expression t = new Expression(val, target, "method", null);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertEquals(0, t.getArguments().length);


        assertEquals("Object=Object.method();", t.toString());
    }

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     */
    public void testConstructor_Value_NullArgument() throws Exception {
        Object val = new Object();
        Object target = new Object();
        Object[] oa = new Object[] { null };
        Expression t = new Expression(val, target, "method", oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertNull(t.getArguments()[0]);


        assertEquals("Object=Object.method(null);", t.toString());
    }

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     * Test the constructor(value, ...) with a null value.
     */
    public void testConstructor_Value_NullValue() throws Exception {
        Object target = new Object();
        Object[] oa = new Object[] { null };
        Expression t = new Expression(null, target, "method", oa);


        assertSame(null, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertNull(t.getArguments()[0]);


        assertEquals("null=Object.method(null);", t.toString());
    }

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    /*
     * Test the constructor(value, ...) with a expression value.
     */
    public void testConstructor_EmptyTarget_EmptyMethod_ExpressionArguments() {
        Object[] objectArray = new Object[] { new Expression((Object) null,
                (String) null, (Object[]) null) };
        Expression expression = new Expression(objectArray, new String(),
                new String(), objectArray);
        assertEquals("ObjectArray=\"\".(Expression);", expression.toString());
    }

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     * Test the setValue() method with a non-null value when the value of the
     * expression is still unbounded.
     */
    public void testSetValue_UnboundNormal() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        t.setValue(mo);
        assertSame(mo, t.getValue());
        MockObject.assertNotCalled();
    }

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     * Test the setValue() method with a null value when the value of the
     * expression is still unbounded.
     */
    public void testSetValue_UnboundNull() throws Exception {
        MockObject mo = new MockObject(false);
        Expression t = new Expression(mo, "method", new Object[0]);
        t.setValue(null);
        assertSame(null, t.getValue());
        MockObject.assertNotCalled();
    }

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