01: package org.mandarax.zkb.framework;
02:
03: /**
04: * Copyright (C) 1999-2004 Jens Dietrich (mailto:mandarax@jbdietrich.com)
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20:
21: import org.jdom.Element;
22: import org.mandarax.kernel.ConstantTerm;
23: import org.mandarax.kernel.LogicFactory;
24: import org.mandarax.zkb.ObjectPersistencyService;
25: import org.mandarax.zkb.ZKBException;
26:
27: /**
28: * An adapter class for constant terms (=java classes).
29: * @see org.mandarax.kernel.ConstantTerm
30: * @author <A href="http://www-ist.massey.ac.nz/JBDietrich" target="_top">Jens Dietrich</A>
31: * @version 3.4 <7 March 05>
32: * @since 2.2
33: */
34: public class Adapter4ConstantTerms extends AbstractAdapter {
35:
36: /**
37: * Export an object, i.e., convert it to an element in the DOM.
38: * @param obj an object
39: * @param driver the generic driver
40: * @param ops the object persistency service
41: * @exception a ZKBException is thrown if export fails
42: */
43: public Element exportObject(Object obj, GenericDriver driver,
44: ObjectPersistencyService ops) throws ZKBException {
45: check(obj, ConstantTerm.class);
46: ConstantTerm constTerm = (ConstantTerm) obj;
47: Element e = new Element(CONSTANT_TERM);
48: assignURI(e, ops, constTerm.getObject());
49: setTypeAttribute(e, constTerm);
50: return e;
51: }
52:
53: /**
54: * Build an object from an XML element.
55: * @param e an element
56: * @param driver the generic driver
57: * @param ops the object persistency service
58: * @param lfactory the logic factory used to create objects
59: * @exception a ZKBException is thrown if export fails
60: */
61: public Object importObject(Element e, GenericDriver driver,
62: ObjectPersistencyService ops, LogicFactory lfactory)
63: throws ZKBException {
64: String type = e.getAttributeValue(TYPE);
65: Object obj = getObjectByURI(e, ops);
66: // assemble term
67: return lfactory.createConstantTerm(obj, class4Name(type));
68: }
69:
70: /**
71: * Get the name of the associated tag (element).
72: * @return a string
73: */
74: public String getTagName() {
75: return CONSTANT_TERM;
76: }
77:
78: /**
79: * Print the DTD associated with this adapter on a string buffer.
80: * @param out the buffer to print on.
81: */
82: public void printDTD(StringBuffer out) {
83: out.append("<!ELEMENT ind (#PCDATA)>\n");
84: out.append("<!ATTLIST ind type CDATA #IMPLIED>\n");
85: }
86:
87: }
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