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

        Object arg1 = "string1";
        Object arg2 = new Object();
        Object arg3 = "string3";
        Object arg4 = new Integer(117);
        Object[] oa = new Object[] { arg1, arg2, arg3, arg4 };
        Expression t = new Expression(target, "method", oa);


        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertSame(arg1, t.getArguments()[0]);
        assertSame(arg2, t.getArguments()[1]);
        assertSame(arg3, t.getArguments()[2]);
        assertSame(arg4, t.getArguments()[3]);


        assertEquals("<unbound>=ExpressionTest$MockParent.method("
                + "\"string1\", Object, \"string3\", Integer);", t.toString());
    }

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     * Test the constructor with null target.
     */
    public void testConstructor_NullTarget() {
        Object arg = new Object();
        Object[] oa = new Object[] { arg };
        Expression t = new Expression(null, "method", oa);


        assertSame(null, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertSame(arg, t.getArguments()[0]);
    }

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     */
    public void testConstructor_ArrayTarget() {
        Object target = new MockParent();
        Object arg = new Object();
        Object[] oa = new Object[] { arg };
        Expression t = new Expression(target, "method", oa);


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


        assertEquals("<unbound>=ExpressionTest$MockParent.method(Object);", t
                .toString());
    }

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     * Test the constructor with null method name.
     */
    public void testConstructor_NullMethodName() {
        Object target = new Object();
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(target, null, oa);


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

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     * Test the constructor with the method name "new".
     */
    public void testConstructor_NewMethodName() {
        Object target = MockObject.class;
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(target, "new", oa);


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


        assertEquals("<unbound>=Class.new(Object);", t.toString());
    }

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     * Test the constructor with empty method name.
     */
    public void testConstructor_EmptyMethodName() {
        Object target = new Object();
        Object[] oa = new Object[] { new Object() };
        Expression t = new Expression(target, "", oa);


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

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    /*
     * Test the constructor with null arguments.
     */
    public void testConstructor_NullArguments() {
        Object target = new MockParent();
        Expression t = new Expression(target, "method", null);


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


        assertEquals("<unbound>=ExpressionTest$MockParent.method();", t
                .toString());
    }

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


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


        assertEquals("<unbound>=ExpressionTest$MockParent.method(null);", t
                .toString());
    }

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        Object arg1 = "mama";
        Object arg2 = new Object();
        Object arg3 = new Object();
        Object arg4 = new Long(7);
        Object[] oa = new Object[] { arg1, arg2, arg3, arg4 };
        Expression t = new Expression(val, target, "method", oa);


        assertSame(val, t.getValue());
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertSame(arg1, t.getArguments()[0]);
        assertSame(arg2, t.getArguments()[1]);
        assertSame(arg3, t.getArguments()[2]);
        assertSame(arg4, t.getArguments()[3]);


        assertEquals("Object=ExpressionTest$MockParent.method("
                + "\"mama\", Object, Object, Long);", t.toString());
    }

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


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


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

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