package com.adito.policyframework;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.adito.jdbc.JDBCPolicyDatabase;
/**
* Policy factory for creating policy databases.
*/
public class PolicyDatabaseFactory {
static Log log = LogFactory.getLog(PolicyDatabaseFactory.class);
static PolicyDatabase instance;
static Class policyDatabaseImpl = JDBCPolicyDatabase.class;
private static boolean locked = false;
/**
* @return An instance of the policy database factory.
*/
public static PolicyDatabase getInstance() {
try {
return instance == null ? instance = (PolicyDatabase) policyDatabaseImpl.newInstance() : instance;
} catch (Exception e) {
log.error("Could not create instance of class " + policyDatabaseImpl.getCanonicalName(), e);
return instance == null ? instance = new JDBCPolicyDatabase() : instance;
}
}
/**
* @param policyFactoryImpl the class of the policy database
* @param lock weather to lock the policy database after setting it.
* @throws IllegalStateException
*/
public static void setFactoryImpl(Class policyDatabaseImpl, boolean lock) throws IllegalStateException {
if (locked) {
throw new IllegalStateException("Policy database factory has been locked by another plugin.");
}
PolicyDatabaseFactory.policyDatabaseImpl = policyDatabaseImpl;
locked = lock;
}
}