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/**
 * 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 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.ErrorMsg;
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(HiveParser.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));
  }
}