Hi, all. Because my current project went on a temporary hiatus, I've finally
had some time to start working with OPaL. Here's my first cut at a ClassMap
loader based on Scott's draft XML schema. This code is rough and undocumented,
and it's hard-coded to use Xerces. It compiles successfully using JDK 1.2, but
I don't know if it successfully compiles under JDK 1.1 or if it even works yet!
However, it's a start. Also, this is the first time I've done _any_ SAX
programming, so be gentle. ;)
--
Christopher Elkins
---
ClassMapLoader.java
===================================================================
package org.apache.turbine.opl.mapping;
/*
* Copyright (c) 1997-1999 The Java Apache Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Java Apache
* Project for use in the Apache JServ servlet engine project
* <http://java.apache.org/>."
*
* 4. The names "Apache JServ", "Apache JServ Servlet Engine", "Turbine",
* "Apache Turbine", "Turbine Project", "Apache Turbine Project" and
* "Java Apache Project" must not be used to endorse or promote products
* derived from this software without prior written permission.
*
* 5. Products derived from this software may not be called "Apache JServ"
* nor may "Apache" nor "Apache JServ" appear in their names without
* prior written permission of the Java Apache Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Java Apache
* Project for use in the Apache JServ servlet engine project
* <http://java.apache.org/>."
*
* THIS SOFTWARE IS PROVIDED BY THE JAVA APACHE PROJECT "AS IS" AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE JAVA APACHE PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Java Apache Group. For more information
* on the Java Apache Project and the Apache JServ Servlet Engine project,
* please see <http://java.apache.org/>.
*
*/
import java.io.*;
import java.util.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
/**
* This class implements the SAX handler for class map documents.
*
* @author Christopher Elkins
*/
public class ClassMapLoader extends HandlerBase {
private static final String ELEMENT_CLASSMAPS = "ClassMaps";
private static final String ELEMENT_CLASSMAP = "ClassMap";
private static final String ELEMENT_ATTRIBUTEMAP = "AttributeMap";
private static final String ELEMENT_COLUMNMAP = "ColumnMap";
private static final String ELEMENT_TABLEMAP = "TableMap";
private static final String ATTRIBUTE_NAME = "Name";
private static final String ATTRIBUTE_PROXY = "Proxy";
private static final String ATTRIBUTE_PKEY = "PKey";
private ClassMap currentClassMap;
private AttributeMap currentAttributeMap;
private ColumnMap currentColumnMap;
private TableMap currentTableMap;
private Vector classMaps;
public ClassMapLoader() {
currentClassMap = null;
currentAttributeMap = null;
currentColumnMap = null;
currentTableMap = null;
classMaps = new Vector();
}
public Vector load(InputStream source) throws Exception {
Parser parser =
ParserFactory.makeParser("org.apache.xerces.parsers.SAXParser");
parser.setDocumentHandler(this);
parser.parse(new InputSource(source));
return classMaps;
}
public void startElement(String name, AttributeList atts)
throws SAXException
{
if (name.equals(ELEMENT_CLASSMAP)) {
ClassMap classMap = new ClassMap(atts.getValue(ATTRIBUTE_NAME));
currentClassMap = classMap;
} else if (name.equals(ELEMENT_ATTRIBUTEMAP)) {
AttributeMap attributeMap =
new AttributeMap(atts.getValue(ATTRIBUTE_NAME));
ColumnMap columnMap = new ColumnMap();
attributeMap.setColumnMap(columnMap);
Boolean isPrimaryKey =
Boolean.valueOf(atts.getValue(ATTRIBUTE_PKEY));
columnMap.setIsKeyColumn(isPrimaryKey.booleanValue());
// FIXME: not currently defined in XML schema
//columnMap.setType();
currentAttributeMap = attributeMap;
currentColumnMap = columnMap;
} else if (name.equals(ELEMENT_COLUMNMAP)) {
currentColumnMap.setName(atts.getValue(ATTRIBUTE_NAME));
} else if (name.equals(ELEMENT_TABLEMAP)) {
TableMap tableMap = new TableMap(atts.getValue(ATTRIBUTE_NAME));
currentTableMap = tableMap;
}
}
public void endElement(String name) throws SAXException {
if (name.equals(ELEMENT_CLASSMAP)) {
classMaps.addElement(currentClassMap);
currentClassMap = null;
} else if (name.equals(ELEMENT_ATTRIBUTEMAP)) {
currentClassMap.addAttributeMap(currentAttributeMap);
currentAttributeMap = null;
} else if (name.equals(ELEMENT_COLUMNMAP)) {
currentColumnMap = null;
} else if (name.equals(ELEMENT_TABLEMAP)) {
currentColumnMap.setTableMap(currentTableMap);
currentTableMap = null;
}
}
}
---
Index: PersistenceBroker.java
===================================================================
RCS file:
/products/cvs/turbine/turbine/src/java/org/apache/turbine/opl/database/PersistenceBroker.java,v
retrieving revision 1.24
diff -c -r1.24 PersistenceBroker.java
*** PersistenceBroker.java 2000/01/15 00:00:54 1.24
--- PersistenceBroker.java 2000/01/21 20:13:04
***************
*** 56,61 ****
--- 56,62 ----
*/
// JDK Classe
+ import java.io.*;
import java.sql.*;
import java.util.*;
***************
*** 332,338 ****
public int retrieveClassMaps()
{
! return 0;
}
// FIXME! Maybe this should be private. It's public to facilitate
--- 333,353 ----
public int retrieveClassMaps()
{
! try {
! ClassMapLoader classMapLoader = new ClassMapLoader();
!
! // FIXME: Need to read the XML mapping document here
! InputStream is = null;
! Vector classMaps = classMapLoader.load(is);
!
! Enumeration e = classMaps.elements();
! while (e.hasMoreElements()) {
! addClassMap((ClassMap)e.nextElement());
! }
! return 1;
! } catch (Exception e) {
! return 0;
! }
}
// FIXME! Maybe this should be private. It's public to facilitate
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