/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.core.parsing.antlr.extractor.statement.handler.dialect.oracle;

import com.google.common.base.Optional;
import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.ASTExtractHandler;
import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.RuleName;
import io.shardingsphere.core.parsing.antlr.extractor.statement.util.ASTUtils;
import io.shardingsphere.core.parsing.antlr.sql.ddl.AlterTableStatement;
import io.shardingsphere.core.parsing.parser.sql.SQLStatement;
import org.antlr.v4.runtime.ParserRuleContext;

/**
 * Drop primary key extract handler for Oracle.
 * 
 * @author duhongjun
 */
public final class OracleDropPrimaryKeyExtractHandler implements ASTExtractHandler {
    
    @Override
    public void extract(final ParserRuleContext rootNode, final SQLStatement statement) {
        AlterTableStatement alterStatement = (AlterTableStatement) statement;
        Optional<ParserRuleContext> dropConstraintNode = ASTUtils.findFirstChildNode(rootNode, RuleName.DROP_CONSTRAINT_CLAUSE);
        if (dropConstraintNode.isPresent()) {
            Optional<ParserRuleContext> primaryKeyNode = ASTUtils.findFirstChildNode(dropConstraintNode.get(), RuleName.PRIMARY_KEY);
            if (primaryKeyNode.isPresent()) {
                alterStatement.setDropPrimaryKey(true);
            }
        }
    }
}

@@ -703,16 +703,64 @@
 racle;%0A%0A
+import org.antlr.v4.runtime.ParserRuleContext;%0A%0A
 import c
@@ -791,16 +791,17 @@
 tional;%0A
+%0A
 import i
@@ -955,24 +955,318 @@
 handler.
-RuleName
+ASTExtractHandler1;%0Aimport io.shardingsphere.core.parsing.antlr.extractor.statement.handler.RuleName;%0Aimport io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.DropPrimaryKeyExtractResult;%0Aimport io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.ExtractResult
 ;%0Aimport
@@ -1477,55 +1477,8 @@
 ent;
-%0Aimport org.antlr.v4.runtime.ParserRuleContext;
 %0A%0A/*
@@ -1638,16 +1638,35 @@
 tHandler
+,ASTExtractHandler1
  %7B%0A    %0A
@@ -2287,11 +2287,654 @@
  %7D%0A    %7D
+%0A%0A    @Override%0A    public ExtractResult extract(ParserRuleContext ancestorNode) %7B%0A        DropPrimaryKeyExtractResult extractResult = new DropPrimaryKeyExtractResult();%0A        Optional%3CParserRuleContext%3E dropConstraintNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.DROP_CONSTRAINT_CLAUSE);%0A        if (dropConstraintNode.isPresent()) %7B%0A            Optional%3CParserRuleContext%3E primaryKeyNode = ASTUtils.findFirstChildNode(dropConstraintNode.get(), RuleName.PRIMARY_KEY);%0A            if (primaryKeyNode.isPresent()) %7B%0A                extractResult.setDropPrimaryKey(true);%0A            %7D%0A        %7D%0A        return extractResult;%0A    %7D
 %0A%7D%0A

implement ASTExtractHandler1