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/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.db.sql;
import java.io.*;
import java.net.*;
import java.sql.*;
import java.util.*;
import org.xml.sax.*;
import javax.xml.parsers.*;
public class XmlSchema implements Schema
{
private final static int CREATE = 0;
private final static int DROP = 1;
List createStmts;
List dropStmts;
Map appMap;
public XmlSchema(URL xmlSchema) throws SAXException, IOException, ParserConfigurationException
{parse(xmlSchema.openStream());}
public XmlSchema(InputStream xmlStream) throws SAXException, IOException, ParserConfigurationException
{parse(xmlStream);}
public XmlSchema()
{}
public void parse(InputStream is) throws SAXException, IOException, ParserConfigurationException
{
createStmts = new ArrayList();
dropStmts = new ArrayList();
appMap = new HashMap();
InputSource isrc = new InputSource();
isrc.setByteStream(is);
/*
* This doesn't seem to matter. How do we validate???
*/
isrc.setSystemId(XmlSchema.class.getResource("schema.dtd").toExternalForm());
SAXParser sp = SAXParserFactory.newInstance().newSAXParser();
MySaxHandler testHandler = new MySaxHandler();
// apparently the finalized interface no
// longer includes these functions..
// everything is set, I hope, in parse...
//sp.setDocumentHandler(testHandler);
//sp.setErrorHandler(testHandler);
sp.parse(isrc, testHandler);
}
private void doStatementList(List stmtList, Connection con)
throws SQLException
{
if (stmtList != null)
{
Statement stmt = null;
try
{
stmt = con.createStatement();
for (Iterator ii = stmtList.iterator(); ii.hasNext();)
stmt.executeUpdate((String) ii.next());
con.commit();
}
catch (SQLException e)
{
ConnectionUtils.attemptRollback(con);
e.fillInStackTrace();
throw e;
}
finally
{StatementUtils.attemptClose(stmt);}
}
}
public String getStatementText(String appName, String stmtName)
{
SqlApp app = (SqlApp) appMap.get(appName);
String out = null;
if (app != null)
out = app.getStatementText(stmtName);
return out;
}
public void createSchema(Connection con) throws SQLException
{doStatementList(createStmts, con);}
public void dropSchema(Connection con) throws SQLException
{doStatementList(dropStmts, con);}
public static void main(String[] argv)
{
try
{
Schema s = new XmlSchema(XmlSchema.class.getResource("/com/mchange/v1/hjug/hjugschema.xml"));
}
catch (Exception e)
{e.printStackTrace();}
}
class MySaxHandler extends HandlerBase
{
int state = -1; //-1 unless we are in drop or create
boolean in_statement = false;
boolean in_comment = false;
StringBuffer charBuff = null;
SqlApp currentApp = null; //non-null iff we are in an application
String currentStmtName = null; //non-null iff we are in a named (application) stmt
public void startElement(String name, AttributeList attributes)
{
if (name.equals("create"))
state = CREATE;
else if (name.equals("drop"))
state = DROP;
else if (name.equals("statement"))
{
in_statement = true;
charBuff = new StringBuffer();
if (currentApp != null)
{
for (int i = 0, len = attributes.getLength(); i < len; ++i)
{
String attr = attributes.getName(i);
if (attr.equals("name"))
{
currentStmtName = attributes.getValue(i);
break;
}
}
}
}
else if (name.equals("comment"))
in_comment = true;
else if (name.equals("application"))
{
for (int i = 0, len = attributes.getLength(); i < len; ++i)
{
String attr = attributes.getName(i);
if (attr.equals("name"))
{
String appName = attributes.getValue(i);
currentApp = (SqlApp) appMap.get(appName);
if (currentApp == null)
{
currentApp = new SqlApp();
appMap.put(appName.intern(), currentApp);
}
break;
}
}
}
}
public void characters(char[] ch, int start, int length)
throws SAXException
{
if (!in_comment)
{
if (in_statement)
charBuff.append(ch, start, length);
}
}
public void endElement(String name)
{
if (name.equals("statement"))
{
String stmtStr = charBuff.toString().trim();
if (state == CREATE)
createStmts.add(stmtStr);
else if (state == DROP)
dropStmts.add(stmtStr);
//System.out.println("Statement: " + stmtStr);
else if (currentApp != null && currentStmtName != null) //named app stmt
currentApp.setStatementText(currentStmtName, stmtStr);
}
else if (name.equals("create") || name.equals("drop"))
state = -1;
else if (name.equals("comment"))
in_comment = false;
else if (name.equals("application"))
currentApp = null;
}
//from IBM examples,.,.
/** Warning. */
public void warning(SAXParseException ex) {
System.err.println("[Warning] "+
//getLocationString(ex)+": "+
ex.getMessage());
}
/** Error. */
public void error(SAXParseException ex) {
System.err.println("[Error] "+
//getLocationString(ex)+": "+
ex.getMessage());
}
/** Fatal error. */
public void fatalError(SAXParseException ex) throws SAXException {
System.err.println("[Fatal Error] "+
//getLocationString(ex)+": "+
ex.getMessage());
throw ex;
}
}
class SqlApp
{
Map stmtMap = new HashMap();
public void setStatementText(String name, String sql)
{stmtMap.put(name, sql);}
public String getStatementText(String name)
{return (String) stmtMap.get(name);}
}
}
