Examples of java.beans.Statement

java.beans.Statement
A Statement object represents a primitive statement in which a single method is applied to a target and a set of arguments - as in "a.setFoo(b)". Note that where this example uses names to denote the target and its argument, a statement object does not require a name space and is constructed with the values themselves. The statement object associates the named method with its environment as a simple set of values: the target and an array of argument values. @since 1.4 @version 1.31 05/23/06 @author Philip Milne


    @Override
    protected void initialize(Class type, Object oldInstance, Object newInstance, Encoder out) {
      Iterator ite = ((Collection) oldInstance).iterator();
      while (ite.hasNext()) {
        out.writeStatement(new Statement(oldInstance, "add", new Object[] {ite.next()}));
      }
    }

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    protected void initialize(Class<?> type, Object oldInstance, Object newInstance, Encoder out) {
      java.util.Collection oldO = (java.util.Collection) oldInstance;
      java.util.Collection newO = (java.util.Collection) newInstance;


      if (newO.size() != 0) {
        out.writeStatement(new Statement(oldInstance, "clear", new Object[] {}));
      }
      for (Iterator i = oldO.iterator(); i.hasNext();) {
        out.writeStatement(new Statement(oldInstance, "add", new Object[] {i.next()}));
      }
    }

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    protected void initialize(Class<?> type, Object oldInstance, Object newInstance, Encoder out) {
      java.util.Collection oldO = (java.util.Collection) oldInstance;
      java.util.Collection newO = (java.util.Collection) newInstance;


      if (newO.size() != 0) {
        out.writeStatement(new Statement(oldInstance, "clear", new Object[] {}));
      }
      for (Iterator i = oldO.iterator(); i.hasNext();) {
        out.writeStatement(new Statement(oldInstance, "add", new Object[] {i.next()}));
      }
    }

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            this.method = "set" + variable;
        }


        protected void setValue(Object target, Object value) {
            //Uses Java Beans API
            Statement statement = new Statement(target, method, new Object[] {value});
            try {
                statement.execute();
            } catch (Exception e) {
                //Should never happen
                throw new RuntimeException("Bean error: " + e.getMessage());
            }
        }

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        }


        public void parse(String line, int startpos, Stack stack) throws IOException {
            Boolean b = getBooleanValue(line, startpos);
            //Uses Java Beans API
            Statement statement = new Statement(getContextObject(stack),
                    method, new Object[] {b});
            try {
                statement.execute();
            } catch (Exception e) {
                //Should never happen
                throw new RuntimeException("Bean error: " + e.getMessage());
            }
        }

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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() };
        Statement t = new Statement(target, "", oa);
        assertSame(target, t.getTarget());
        assertSame("", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertEquals("Object.(Object);", t.toString());
    }

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    /*
     * Test the constructor with null arguments.
     */
    public void testConstructor_NullArguments() {
        Object target = new Object();
        Statement t = new Statement(target, "method", null);
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertEquals(0, t.getArguments().length);
        assertEquals("Object.method();", t.toString());
    }

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     * Test the constructor with a null argument.
     */
    public void testConstructor_NullArgument() {
        Object target = new Object();
        Object[] oa = new Object[] { null };
        Statement t = new Statement(target, "method", oa);
        assertSame(target, t.getTarget());
        assertSame("method", t.getMethodName());
        assertSame(oa, t.getArguments());
        assertNull(t.getArguments()[0]);
        assertEquals("Object.method(null);", t.toString());
    }

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     * Test the method execute() with a normal object, a valid method name and
     * valid arguments.
     */
    public void testExecute_NormalInstanceMethod() throws Exception {
        MockObject mo = new MockObject(false);
        Statement t = new Statement(mo, "method", new Object[0]);
        t.execute();
        MockObject.assertCalled("method1", new Object[0]);
        t = new Statement(mo, "method", null);
        t.execute();
        MockObject.assertCalled("method1", new Object[0]);
    }

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     * arguments.
     */
    public void testExecute_NormalInstanceMethodNull() throws Exception {
        MockObject mo = new MockObject(false);
        Object[] arguments = new Object[] { null, null, null };
        Statement t = new Statement(mo, "method", arguments);


        t.execute();
        MockObject.assertCalled("method5", arguments);
    }

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