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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.das.rdb.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Hashtable;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import org.apache.log4j.Logger;
import org.apache.tuscany.das.rdb.graphbuilder.schema.ResultSetTypeMap;
import commonj.sdo.Type;
public class SchemaFileToXSD {
private static final Logger logger = Logger.getLogger(SchemaFileToXSD.class);
private static XMLInputFactory xmlFactory;
protected static DBSchema read(XMLStreamReader reader) throws Exception {
DBSchema dbSchema = new DBSchema();
Table table = null;
Column column = null;
ForeignKey fk = null;
ForeignKeyRef fkRef = null;
while (true) {
int event = reader.next();
if(javax.xml.stream.XMLStreamConstants.END_DOCUMENT == event) {
break;
}
switch (event) {
case javax.xml.stream.XMLStreamConstants.START_ELEMENT:
if (reader.getName().getLocalPart().equals("table")) {
table = new Table();
table.setName(reader.getAttributeValue(null, "name"));
} else if (reader.getName().getLocalPart().equals("column")) {
column = new Column();
column.setName(reader.getAttributeValue(null, "name"));
column.setPK(Boolean.getBoolean(reader.getAttributeValue(null, "primaryKey")));
column.setRequired(Boolean.getBoolean(reader.getAttributeValue(null, "required")));
column.setType(reader.getAttributeValue(null, "type"));
}
else if (reader.getName().getLocalPart().equals("foreign-key")) {
fk = new ForeignKey();
fk.setForeignTableName(reader.getAttributeValue(null,"foreignTable"));
}
else if (reader.getName().getLocalPart().equals("reference")) {
fkRef = new ForeignKeyRef();
fkRef.setForeign(reader.getAttributeValue(null,"foreign"));
fkRef.setLocal(reader.getAttributeValue(null,"local"));
}
else if (reader.getName().getLocalPart().equals("database")) {
//ignore
} else {
throw new RuntimeException("not valid element:"+reader.getName()+":");
}
break;
case javax.xml.stream.XMLStreamConstants.END_ELEMENT:
if (reader.getName().getLocalPart().equals("table")) {
dbSchema.getTables().add(table);
}
if (reader.getName().getLocalPart().equals("column")) {
if(table != null) {
table.getColumns().add(column);
}
}
if (reader.getName().getLocalPart().equals("reference")) {
if(fk != null) {
fk.getFkRefs().add(fkRef);
}
}
if (reader.getName().getLocalPart().equals("foreign-key")) {
if(table != null) {
table.getFks().add(fk);
}
}
break;
}
}
if (logger.isDebugEnabled()) {
logger.debug(dbSchema);
}
return dbSchema;
}
protected static void convert(String schemaFileName, String xsdModelFileName) throws Exception{
xmlFactory = XMLInputFactory.newInstance();
File schemaFile = new File(schemaFileName);
FileInputStream flStrm = new FileInputStream(schemaFile);
XMLStreamReader reader = xmlFactory.createXMLStreamReader(new InputStreamReader(flStrm));
DBSchema dbSchema = read(reader);
flStrm.close();
generateXSD(dbSchema, xsdModelFileName);
}
protected static void generateXSD(DBSchema dbSchema, String xsdModelFileName) throws Exception {
boolean writeFilesToDir = false;
String startLine = "<xsd:schema xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:this=\"http:///org.apache.tuscany.das.rdb.test/schemaModel.xsd\" targetNamespace=\"http:///org.apache.tuscany.das.rdb.test/schemaModel.xsd\">\n";
String endLine = "</xsd:schema>";
if(xsdModelFileName != null && !xsdModelFileName.trim().equals("")) {
writeFilesToDir = true;
}
//get all FKs to form a Map - PKtable -> FKTable , e.g. if CITIES has FK such that CITIES.STATE_ID is STATES.ID, then
//the map shall have STATES -> CITIES, TABLE2,...
Hashtable pkTofkTable = new Hashtable();
for(int i=0; i<dbSchema.getTables().size(); i++) {
Table curTable = (Table)dbSchema.getTables().get(i);
for(int k=0; k<curTable.getFks().size(); k++) {
ForeignKey curFK = (ForeignKey)curTable.getFks().get(k);
String pkTableName = curFK.getForeignTableName();
if(pkTofkTable.get(pkTableName) == null) {
pkTofkTable.put(pkTableName, new ArrayList());
}
((ArrayList)pkTofkTable.get(pkTableName)).add(curTable.getName());
}
}
String srcCode = startLine;
for(int i=0; i<dbSchema.getTables().size(); i++) {
Table curTable = (Table)dbSchema.getTables().get(i);
srcCode = srcCode + "<xsd:complexType name=\""+curTable.getName()+"\">\n";
srcCode = srcCode + " <xsd:sequence>\n";
for(int j=0; j<curTable.getColumns().size(); j++) {
Column curColumn = (Column)curTable.getColumns().get(j);
srcCode = srcCode + " <xsd:element name=\""+ curColumn.getName();
if(curColumn.isRequired()) {
srcCode = srcCode + " nillable=\"false\"";
}
Type sdoType = ResultSetTypeMap.INSTANCE.getType(SQLTypeChecker.getSQLTypeFromString(curColumn.getType()), true);
srcCode = srcCode + " type=\"xsd:"+SQLTypeChecker.xsdTypeForSDOType(sdoType.getName())+"\"/>\n";
}
if(pkTofkTable.get(curTable.getName()) != null) {
ArrayList fkTables = (ArrayList)pkTofkTable.get(curTable.getName());
for(int k=0; k<fkTables.size(); k++) {
srcCode = srcCode + " <xsd:element maxOccurs=\"unbounded\" name=\""+ fkTables.get(k)+"\" type=\"this:"+fkTables.get(k)+"\"/>\n";
}
}
srcCode = srcCode + " </xsd:sequence>\n";
srcCode = srcCode + "</xsd:complexType>\n\n";
}
srcCode = srcCode + endLine;
File javaFile = new File(xsdModelFileName);
javaFile.createNewFile();
PrintStream flStrm = new PrintStream(javaFile);
if(writeFilesToDir) {
flStrm.print(srcCode);
flStrm.flush();
flStrm.close();
} else {
System.out.print(srcCode);
}
}
}
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