Examples with SQLOperation org.datanucleus.store.rdbms.sql.operation.SQLOperation used on opensource projects

Example 1 with SQLOperation

use of org.datanucleus.store.rdbms.sql.operation.SQLOperation in project datanucleus-rdbms by datanucleus.

the class SQLExpressionFactory method invokeOperation.

/**
 * Accessor for the result of an SQLOperation call on the supplied expression with the supplied args.
 * Throws a NucleusException is the method is not supported.
 * @param name Operation to be invoked
 * @param expr The first expression to perform the operation on
 * @param expr2 The second expression to perform the operation on
 * @return The result
 * @throws UnsupportedOperationException if the operation is not specified
 */
public SQLExpression invokeOperation(String name, SQLExpression expr, SQLExpression expr2) {
    // Check for instantiated plugin SQLOperation
    DatastoreAdapter dba = storeMgr.getDatastoreAdapter();
    SQLOperation operation = sqlOperationsByName.get(name);
    if (operation != null) {
        return operation.getExpression(expr, expr2);
    }
    // Check for built-in SQLOperation class definition
    Class sqlOpClass = dba.getSQLOperationClass(name);
    if (sqlOpClass != null) {
        try {
            // Instantiate it
            operation = (SQLOperation) sqlOpClass.newInstance();
            sqlOperationsByName.put(name, operation);
            return operation.getExpression(expr, expr2);
        } catch (Exception e) {
            throw new NucleusException("Error creating SQLOperation of type " + sqlOpClass.getName() + " for operation " + name);
        }
    }
    // Check for plugin definition of this operation for this datastore
    // 1). Try datastore-dependent key
    String datastoreId = dba.getVendorID();
    String key = getSQLOperationKey(datastoreId, name);
    boolean datastoreDependent = true;
    if (!pluginSqlOperationKeysSupported.contains(key)) {
        // 2). No datastore-dependent method, so try a datastore-independent key
        key = getSQLOperationKey(null, name);
        datastoreDependent = false;
        if (!pluginSqlOperationKeysSupported.contains(key)) {
            throw new UnsupportedOperationException("Operation " + name + " on datastore=" + datastoreId + " not supported");
        }
    }
    PluginManager pluginMgr = storeMgr.getNucleusContext().getPluginManager();
    String[] attrNames = (datastoreDependent ? new String[] { "name", "datastore" } : new String[] { "name" });
    String[] attrValues = (datastoreDependent ? new String[] { name, datastoreId } : new String[] { name });
    try {
        operation = (SQLOperation) pluginMgr.createExecutableExtension("org.datanucleus.store.rdbms.sql_operation", attrNames, attrValues, "evaluator", null, null);
        synchronized (operation) {
            sqlOperationsByName.put(key, operation);
            return operation.getExpression(expr, expr2);
        }
    } catch (Exception e) {
        throw new NucleusUserException(Localiser.msg("060011", "operation=" + name), e);
    }
}