/**
* 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.hadoop.hive.ql.parse;
import static org.apache.hadoop.hive.ql.parse.HiveParser.TOK_IFEXISTS;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.TaskFactory;
import org.apache.hadoop.hive.ql.plan.CreateFunctionDesc;
import org.apache.hadoop.hive.ql.plan.DropFunctionDesc;
import org.apache.hadoop.hive.ql.plan.FunctionWork;
/**
* FunctionSemanticAnalyzer.
*
*/
public class FunctionSemanticAnalyzer extends BaseSemanticAnalyzer {
private static final Log LOG = LogFactory
.getLog(FunctionSemanticAnalyzer.class);
public FunctionSemanticAnalyzer(HiveConf conf) throws SemanticException {
super(conf);
}
@Override
public void analyzeInternal(ASTNode ast) throws SemanticException {
if (ast.getToken().getType() == HiveParser.TOK_CREATEFUNCTION) {
analyzeCreateFunction(ast);
}
if (ast.getToken().getType() == HiveParser.TOK_DROPFUNCTION) {
analyzeDropFunction(ast);
}
LOG.info("analyze done");
}
private void analyzeCreateFunction(ASTNode ast) throws SemanticException {
String functionName = ast.getChild(0).getText();
String className = unescapeSQLString(ast.getChild(1).getText());
CreateFunctionDesc desc = new CreateFunctionDesc(functionName, className);
rootTasks.add(TaskFactory.get(new FunctionWork(desc), conf));
}
private void analyzeDropFunction(ASTNode ast) throws SemanticException {
String functionName = ast.getChild(0).getText();
boolean ifExists = (ast.getFirstChildWithType(TOK_IFEXISTS) != null);
// we want to signal an error if the function doesn't exist and we're
// configured not to ignore this
boolean throwException =
!ifExists && !HiveConf.getBoolVar(conf, ConfVars.DROPIGNORESNONEXISTENT);
if (throwException && FunctionRegistry.getFunctionInfo(functionName) == null) {
throw new SemanticException(ErrorMsg.INVALID_FUNCTION.getMsg(functionName));
}
DropFunctionDesc desc = new DropFunctionDesc(functionName);
rootTasks.add(TaskFactory.get(new FunctionWork(desc), conf));
}
}