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package com.c2kernel.persistency;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import org.xmldb.api.DatabaseManager;
import org.xmldb.api.base.Collection;
import org.xmldb.api.base.Database;
import org.xmldb.api.base.ErrorCodes;
import org.xmldb.api.base.Resource;
import org.xmldb.api.base.XMLDBException;
import org.xmldb.api.modules.CollectionManagementService;
import com.c2kernel.entity.C2KLocalObject;
import com.c2kernel.persistency.outcome.Outcome;
import com.c2kernel.process.Gateway;
import com.c2kernel.process.auth.Authenticator;
import com.c2kernel.utils.Logger;
public class XMLDBClusterStorage extends ClusterStorage {
public static final String XMLDB_URI = "XMLDB.URI";
public static final String XMLDB_USER = "XMLDB.user";
public static final String XMLDB_PASSWORD = "XMLDB.password";
public static final String XMLDB_ROOT = "XMLDB.root";
protected Database database;
protected Collection root;
public XMLDBClusterStorage() throws Exception {
}
/**
* @param parent
* @param name
* @param create
* @return
* @throws ClusterStorageException
*/
protected static Collection verifyCollection(Collection parent, String name, boolean create) throws ClusterStorageException {
Collection coll;
try {
coll = parent.getChildCollection(name);
if (coll == null)
throw new XMLDBException(ErrorCodes.NO_SUCH_COLLECTION);
} catch (XMLDBException ex) {
if (ex.errorCode == ErrorCodes.NO_SUCH_COLLECTION) {
if (create) {
try {
CollectionManagementService collManager = (CollectionManagementService)parent.getService("CollectionManagementService", "1.0");
coll = collManager.createCollection(name);
} catch (Exception ex2) {
throw new ClusterStorageException("Could not create XMLDB collection for item "+name);
}
}
else // not found
return null;
}
else {
Logger.error(ex);
throw new ClusterStorageException("Error loading XMLDB collection for item "+name);
}
}
return coll;
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#open()
*/
@Override
public void open(Authenticator auth) throws ClusterStorageException {
final String driver = "org.exist.xmldb.DatabaseImpl";
// Uncomment the following for integrated existdb
//System.setProperty("exist.initdb", "true");
//System.setProperty("exist.home", Gateway.getProperty("XMLDB.home"));
try {
Class<?> cl = Class.forName(driver);
database = (Database) cl.newInstance();
database.setProperty("create-database", "true");
DatabaseManager.registerDatabase(database);
Collection db = DatabaseManager.getCollection(Gateway.getProperties().getProperty(XMLDB_URI),
Gateway.getProperties().getProperty(XMLDB_USER), Gateway.getProperties().getProperty(XMLDB_PASSWORD));
String rootColl = Gateway.getProperties().getProperty(XMLDB_ROOT);
if (rootColl != null && rootColl.length()>0) {
root = verifyCollection(db, rootColl, true);
db.close();
}
else
root = db;
} catch (Exception ex) {
Logger.error(ex);
throw new ClusterStorageException("Error initializing XMLDB");
}
if (root == null)
throw new ClusterStorageException("Root collection is null. Problem connecting to XMLDB.");
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#close()
*/
@Override
public void close() throws ClusterStorageException {
try {
root.close();
//DatabaseInstanceManager manager = (DatabaseInstanceManager)db.getService("DatabaseInstanceManager", "1.0");
//manager.shutdown();
} catch (XMLDBException e) {
Logger.error(e);
throw new ClusterStorageException("Error shutting down eXist XMLDB");
}
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#queryClusterSupport(java.lang.String)
*/
@Override
public short queryClusterSupport(String clusterType) {
return READWRITE;
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#getName()
*/
@Override
public String getName() {
return "XMLDB";
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#getId()
*/
@Override
public String getId() {
return "XMLDB";
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#get(java.lang.Integer, java.lang.String)
*/
@Override
public C2KLocalObject get(Integer sysKey, String path)
throws ClusterStorageException {
String type = ClusterStorage.getClusterType(path);
// Get item collection
String strSysKey = String.valueOf(sysKey);
Collection itemColl = verifyCollection(root, strSysKey, false);
if (itemColl == null) return null; // doesn't exist
try {
String resourceName = path.replace('/', '.');
Resource resource = itemColl.getResource(resourceName);
if (resource != null) {
String objString = (String)resource.getContent();
itemColl.close();
if (type.equals(OUTCOME))
return new Outcome(path, objString);
else {
C2KLocalObject obj = (C2KLocalObject)Gateway.getMarshaller().unmarshall(objString);
return obj;
}
}
else
return null;
} catch (Exception e) {
Logger.error(e);
throw new ClusterStorageException("XMLDB error");
}
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#put(java.lang.Integer, com.c2kernel.entity.C2KLocalObject)
*/
@Override
public void put(Integer sysKey, C2KLocalObject obj)
throws ClusterStorageException {
String resName = getPath(obj);
String strSysKey = String.valueOf(sysKey);
Collection itemColl = verifyCollection(root, strSysKey, true);
try {
resName = resName.replace('/', '.');
String objString = Gateway.getMarshaller().marshall(obj);
Resource res = itemColl.getResource(resName);
if (res == null)
res = itemColl.createResource(resName, "XMLResource");
res.setContent(objString);
itemColl.storeResource(res);
itemColl.close();
} catch (Exception e) {
Logger.error(e);
throw new ClusterStorageException("XMLDB error");
}
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#delete(java.lang.Integer, java.lang.String)
*/
@Override
public void delete(Integer sysKey, String path)
throws ClusterStorageException {
String strSysKey = String.valueOf(sysKey);
Collection itemColl = verifyCollection(root, strSysKey, false);
if (itemColl == null) return;
try {
String resource = path.replace('/', '.');
Resource res = itemColl.getResource(resource);
if (res != null) itemColl.removeResource(res);
itemColl.close(); itemColl.close();
} catch (Exception e) {
Logger.error(e);
throw new ClusterStorageException("XMLClusterStorage.delete() - Could not delete "+path+" to "+sysKey);
}
}
/* (non-Javadoc)
* @see com.c2kernel.persistency.ClusterStorage#getClusterContents(java.lang.Integer, java.lang.String)
*/
@Override
public String[] getClusterContents(Integer sysKey, String path)
throws ClusterStorageException {
String strSysKey = String.valueOf(sysKey);
Collection coll = verifyCollection(root, strSysKey, false);
if (coll == null) return new String[0];
ArrayList<String> contents = new ArrayList<String>();
// Find prefix for our path level
StringBuffer resPrefix = new StringBuffer();
String[] pathComps = path.split("/");
if (pathComps.length > 0)
for (int i = 0; i < pathComps.length; i++) {
if (pathComps[i].length()>0) resPrefix.append(pathComps[i]).append(".");
}
// Look at each entry for matches. Trim off the ends.
try {
for (String res: coll.listResources()) {
if (res.startsWith(resPrefix.toString())) {
String resName = URLDecoder.decode(res.substring(resPrefix.length()), "UTF-8");
if (resName.indexOf('.')>-1)
resName = resName.substring(0, resName.indexOf('.'));
if (!contents.contains(resName)) contents.add(resName);
}
}
} catch (XMLDBException e) {
Logger.error(e);
throw new ClusterStorageException("Error listing collection resources for item "+strSysKey);
} catch (UnsupportedEncodingException e) {
Logger.error(e);
throw new ClusterStorageException("Error listing decoding resource name for item "+strSysKey);
}
return contents.toArray(new String[contents.size()]);
}
}
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