com.orientechnologies.orient.core.sql.ODynamicSQLElementFactory Maven / Gradle / Ivy
/*
* Copyright 2012 Orient Technologies.
*
* Licensed 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 com.orientechnologies.orient.core.sql;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import com.orientechnologies.orient.core.exception.OCommandExecutionException;
import com.orientechnologies.orient.core.sql.functions.OSQLFunction;
import com.orientechnologies.orient.core.sql.functions.OSQLFunctionFactory;
import com.orientechnologies.orient.core.sql.operator.OQueryOperator;
import com.orientechnologies.orient.core.sql.operator.OQueryOperatorFactory;
/**
* Dynamic sql elements factory.
*
* @author Johann Sorel (Geomatys)
*/
public class ODynamicSQLElementFactory implements OCommandExecutorSQLFactory, OQueryOperatorFactory, OSQLFunctionFactory {
// Used by SQLEngine to register on the fly new elements
static final Map FUNCTIONS = new ConcurrentHashMap();
static final Map> COMMANDS = new ConcurrentHashMap>();
static final Set OPERATORS = Collections
.synchronizedSet(new HashSet());
public Set getFunctionNames() {
return FUNCTIONS.keySet();
}
public boolean hasFunction(final String name) {
return FUNCTIONS.containsKey(name);
}
public OSQLFunction createFunction(final String name) throws OCommandExecutionException {
final Object obj = FUNCTIONS.get(name);
if (obj == null) {
throw new OCommandExecutionException("Unknown function name :" + name);
}
if (obj instanceof OSQLFunction) {
return (OSQLFunction) obj;
} else {
// it's a class
final Class clazz = (Class) obj;
try {
return (OSQLFunction) clazz.newInstance();
} catch (Exception e) {
throw new OCommandExecutionException("Error in creation of function " + name
+ "(). Probably there is not an empty constructor or the constructor generates errors", e);
}
}
}
public Set getCommandNames() {
return COMMANDS.keySet();
}
public OCommandExecutorSQLAbstract createCommand(final String name) throws OCommandExecutionException {
final Class clazz = COMMANDS.get(name);
if (clazz == null)
throw new OCommandExecutionException("Unknown command name :" + name);
try {
return clazz.newInstance();
} catch (Exception e) {
throw new OCommandExecutionException("Error in creation of command " + name
+ "(). Probably there is not an empty constructor or the constructor generates errors", e);
}
}
public Set getOperators() {
return OPERATORS;
}
}