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

            //use the default constructor
            AffineTransform tx = new AffineTransform();
            PathIterator itr = a.getPathIterator(tx);
            
            GeneralPath path = new GeneralPath();
            out.writeExpression(new Expression(path, GeneralPath.class, "new", new Object[0]));
            
            while (!itr.isDone()) {
                float[] segment = new float[6]; //must use floats because lineTo etc use floats
                int pathType = itr.currentSegment(segment);
                
                switch (pathType) {
                    case PathIterator.SEG_CLOSE:
                        out.writeStatement(new Statement(path, "closePath", new Object[0]));
                        break;
                    case PathIterator.SEG_CUBICTO:
                        out.writeStatement(new Statement(path, "curveTo", new Object[] {segment[0], segment[1], segment[2], segment[3], segment[4], segment[5]}));
                        break;
                    case PathIterator.SEG_LINETO:
                        out.writeStatement(new Statement(path, "lineTo", new Object[] {segment[0], segment[1]}));
                        break;
                    case PathIterator.SEG_MOVETO:
                        out.writeStatement(new Statement(path, "moveTo", new Object[] {segment[0], segment[1]}));
                        break;
                    case PathIterator.SEG_QUADTO:
                        out.writeStatement(new Statement(path, "quadTo", new Object[] {segment[0], segment[1], segment[2], segment[3]}));
                        break;
                }
                itr.next();
            }
            
            return new Expression(a, Area.class, "new", new Object[] {path});
        }

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        }
    }
    public static final class GeneralPathDelegate extends PersistenceDelegate {
        @Override
        protected Expression instantiate(Object oldInstance, Encoder out) {
            return new Expression(oldInstance, GeneralPath.class, "new", new Object[0]);
        }

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            for ( Field field : type.getFields() ) {
                int mod = field.getModifiers();
                if ( Modifier.isPublic( mod ) && Modifier.isStatic( mod ) && Modifier.isFinal( mod ) && ( type == field.getDeclaringClass() ) ) {
                    try {
                        if ( oldInstance == field.get( null ) )
                            return new Expression( oldInstance, field, "get", new Object[]{null} );
                    } catch ( IllegalAccessException exception ) {
                        throw new IllegalArgumentException( "Could not get value of the field: " + field, exception );
                    }
                }
            }

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    public static final class RenderingHintsDelegate extends PersistenceDelegate {
        @Override
        protected Expression instantiate(Object oldInstance, Encoder out) {
            //u.p("rh inst");
            // give it a constructor w/ null as the argument
            return new Expression(oldInstance, oldInstance.getClass(),
                    "new", new Object[] { null });
        }

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                // System.out.println("doRun(): arg [" + i + "] =
                // null");
                // }
                // }


                Expression expr = new Expression(target, methodName,
                        getArgumentsValues());
                result = new Argument(expr.getValue());


                if (isPrimitiveClassName(getTagName())) {
                    result.setType(getPrimitiveClass(tagName));
                }

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   * Java 1.5 workaround. From http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5015403
   */
  public static class EnumDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      return new Expression(Enum.class, "valueOf", new Object[] {oldInstance.getClass(),
          ((Enum<?>) oldInstance).name()});
    }

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  public static class MapDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Map oldMap = (Map) oldInstance;
      HashMap newMap = new HashMap(oldMap);
      return new Expression(newMap, HashMap.class, "new", new Object[] {});
    }

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  public static class SetDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Set oldSet = (Set) oldInstance;
      HashSet newSet = new HashSet(oldSet);
      return new Expression(newSet, HashSet.class, "new", new Object[] {});
    }

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  public static class ListDelegate extends DefaultPersistenceDelegate {
    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      List oldList = (List) oldInstance;
      ArrayList newList = new ArrayList(oldList);
      return new Expression(newList, ArrayList.class, "new", new Object[] {});
    }

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    @Override
    protected Expression instantiate(Object oldInstance, Encoder out) {
      Date dateVal = (Date)oldInstance;
      Object[] args = { dateVal.getTime() };
      return new Expression(dateVal, dateVal.getClass(), "new", args);
    }

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