/*
 * 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.sqlserver;

import org.antlr.v4.runtime.ParserRuleContext;

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.ASTExtractHandler1;
import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.RuleName;
import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.ExtractResult;
import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.SQLTokenExtractResult;
import io.shardingsphere.core.parsing.antlr.extractor.statement.util.ASTUtils;
import io.shardingsphere.core.parsing.parser.sql.SQLStatement;
import io.shardingsphere.core.parsing.parser.token.IndexToken;
import io.shardingsphere.core.util.SQLUtil;

/**
 * Drop index extract handler for SQLServer.
 * 
 * @author duhongjun
 */
public final class SQLServerDropIndexExtractHandler implements ASTExtractHandler,ASTExtractHandler1 {
    
    @Override
    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) {
        Optional<ParserRuleContext> indexDefOptionNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.ALTER_DROP_INDEX);
        if (indexDefOptionNode.isPresent()) {
            Optional<ParserRuleContext> indexNameNode = ASTUtils.findFirstChildNode(indexDefOptionNode.get(), RuleName.INDEX_NAME);
            if (indexNameNode.isPresent()) {
                statement.getSQLTokens().add(
                        new IndexToken(indexNameNode.get().getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNameNode.get().getText()), statement.getTables().getSingleTableName()));
            }
        }
    }

    @Override
    public ExtractResult extract(ParserRuleContext ancestorNode) {
        Optional<ParserRuleContext> indexDefOptionNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.ALTER_DROP_INDEX);
        if (!indexDefOptionNode.isPresent()) {
            return null;
        }
        Optional<ParserRuleContext> indexNameNode = ASTUtils.findFirstChildNode(indexDefOptionNode.get(), RuleName.INDEX_NAME);
        if (!indexNameNode.isPresent()) {
            return null;
        }
        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();
        extractResult.getSqlTokens().add(
                new IndexToken(indexNameNode.get().getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNameNode.get().getText()), null));
        return extractResult;
    }
}

@@ -890,100 +890,8 @@
 er;%0A
-import io.shardingsphere.core.parsing.antlr.extractor.statement.handler.ASTExtractHandler1;%0A
 impo
@@ -968,16 +968,16 @@
 leName;%0A
+
 import i
@@ -1247,71 +1247,8 @@
 ls;%0A
-import io.shardingsphere.core.parsing.parser.sql.SQLStatement;%0A
 impo
@@ -1513,761 +1513,10 @@
 dler
-,ASTExtractHandler1 %7B%0A    %0A    @Override%0A    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) %7B%0A        Optional%3CParserRuleContext%3E indexDefOptionNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.ALTER_DROP_INDEX);%0A        if (indexDefOptionNode.isPresent()) %7B%0A            Optional%3CParserRuleContext%3E indexNameNode = ASTUtils.findFirstChildNode(indexDefOptionNode.get(), RuleName.INDEX_NAME);%0A            if (indexNameNode.isPresent()) %7B%0A                statement.getSQLTokens().add(%0A                        new IndexToken(indexNameNode.get().getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNameNode.get().getText()), statement.getTables().getSingleTableName()));%0A            %7D%0A        %7D%0A    %7D
+ %7B
 %0A%0A  

remove unused code