/* A criterion to constrain the class of an object in the host model.
Copyright (c) 2003-2008 The Regents of the University of California.
All rights reserved.
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*/
package ptolemy.actor.gt.ingredients.criteria;
import ptolemy.actor.gt.GTIngredientElement;
import ptolemy.actor.gt.GTIngredientList;
import ptolemy.actor.gt.ValidationException;
import ptolemy.kernel.util.NamedObj;
//////////////////////////////////////////////////////////////////////////
//// SubclassCriterion
/**
A criterion to constrain the class of an object in the host model.
@author Thomas Huining Feng
@version $Id$
@since Ptolemy II 8.0
@Pt.ProposedRating Yellow (tfeng)
@Pt.AcceptedRating Red (tfeng)
*/
public class SubclassCriterion extends Criterion {
/** Construct a criterion within the given list as its owner. All elements
* are enabled and are initialized to empty at the beginning.
*
* @param owner The list as the owner of the constructed GTIngredientList.
*/
public SubclassCriterion(GTIngredientList owner) {
this(owner, "");
}
/** Construct a criterion within the given list as its owner and initialize
* all the elements with the given values, which are a string encoding of
* those elements. All elements are enabled at the beginning.
*
* @param owner The list as the owner of the constructed GTIngredientList.
* @param values The string encoding of the values of the elements.
*/
public SubclassCriterion(GTIngredientList owner, String values) {
super(owner, 1);
setValues(values);
}
/** Get the array of elements defined in this GTIngredient.
*
* @return The array of elements.
*/
public GTIngredientElement[] getElements() {
return _ELEMENTS;
}
/** Get the superclass element.
*
* @return The superclass element.
*/
public String getSuperclass() {
return _superclass;
}
/** Get the value of the index-th elements.
*
* @param index The index.
* @return The value.
* @see #setValue(int, Object)
*/
public Object getValue(int index) {
switch (index) {
case 0:
return _superclass;
default:
return null;
}
}
/** Get a string that describes the values of all the elements.
*
* @return A string that describes the values of all the elements.
* @see #setValues(String)
*/
public String getValues() {
StringBuffer buffer = new StringBuffer();
_encodeStringField(buffer, 0, _superclass);
return buffer.toString();
}
/** Test whether the given object in the host model matches the object in
* the pattern that has this criterion.
*
* @param object The object.
* @return true if the object matches.
*/
public boolean match(NamedObj object) {
try {
Class<?> superclass = Class.forName(_superclass);
if (superclass.isInstance(object)) {
return true;
} else {
return false;
}
} catch (ClassNotFoundException e) {
return false;
}
}
/** Set the value of the index-th element.
*
* @param index The index.
* @param value The value.
* @see #getValue(int)
*/
public void setValue(int index, Object value) {
switch (index) {
case 0:
_superclass = (String) value;
break;
}
}
/** Set the values of all the elements with a string that describes them.
*
* @param values A string that describes the new values of all the
* elements.
* @see #getValues()
*/
public void setValues(String values) {
FieldIterator fieldIterator = new FieldIterator(values);
_superclass = _decodeStringField(0, fieldIterator);
}
/** Validate the enablements and values of all the elements.
*
* @exception ValidationException If some elements are invalid.
*/
public void validate() throws ValidationException {
if (_superclass.equals("")) {
throw new ValidationException("Superclass name must not be "
+ "empty.");
}
try {
Class.forName(_superclass);
} catch (Throwable t) {
throw new ValidationException("Cannot load class \"" + _superclass
+ "\".", t);
}
}
/** The elements.
*/
private static final CriterionElement[] _ELEMENTS = { new StringCriterionElement(
"superclass", false) };
/** Value of the superclass element.
*/
private String _superclass;
}