Source Code Cross Referenced for Adapter4VariableTerms.java in  » Rule-Engine » Mandarax » org » mandarax » zkb » framework » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » Mandarax » org.mandarax.zkb.framework 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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.LogicFactory;
23:        import org.mandarax.kernel.VariableTerm;
24:        import org.mandarax.zkb.ObjectPersistencyService;
25:        import org.mandarax.zkb.ZKBException;
26:
27:        /**
28:         * An adapter class for variable terms.
29:         * @see org.mandarax.kernel.VariableTerm
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 Adapter4VariableTerms 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, VariableTerm.class);
46:                VariableTerm varTerm = (VariableTerm) obj;
47:                Element e = new Element(VARIABLE_TERM);
48:                // add name and type
49:                e.setAttribute(NAME, varTerm.getName());
50:                setTypeAttribute(e, varTerm);
51:                return e;
52:            }
53:
54:            /**
55:             * Build an object from an XML element.
56:             * @param e an element
57:             * @param driver the generic driver
58:             * @param ops the object persistency service
59:             * @param lfactory the logic factory used to create objects
60:             * @exception a ZKBException is thrown if import fails
61:             */
62:            public Object importObject(Element e, GenericDriver driver,
63:                    ObjectPersistencyService ops, LogicFactory lfactory)
64:                    throws ZKBException {
65:                String name = e.getAttribute(NAME).getValue();
66:                Class type = class4Name(e.getAttributeValue(TYPE));
67:                return lfactory.createVariableTerm(name, type);
68:            }
69:
70:            /**
71:             * Get the name of the associated tag (element).
72:             * @return a string
73:             */
74:            public String getTagName() {
75:                return VARIABLE_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 var (#PCDATA)>\n");
84:                out.append("<!ATTLIST var name CDATA #REQUIRED>\n");
85:                out.append("<!ATTLIST var type CDATA #IMPLIED>\n");
86:            }
87:
88:        }
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