/*
 * 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;

import com.google.common.base.Optional;

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.sql.ddl.DDLStatement;
import io.shardingsphere.core.parsing.parser.token.IndexToken;
import io.shardingsphere.core.util.SQLUtil;
import org.antlr.v4.runtime.ParserRuleContext;

/**
 * Index name extract handler.
 * 
 * @author duhongjun
 */
public final class IndexNameExtractHandler implements ASTExtractHandler,ASTExtractHandler1 {
    
    @Override
    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) {
        DDLStatement ddlStatement = (DDLStatement) statement;
        Optional<ParserRuleContext> indexNameNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.INDEX_NAME);
        if (indexNameNode.isPresent()) {
            String tableName = ddlStatement.getTables().isEmpty() ? "" : ddlStatement.getTables().getSingleTableName();
            statement.getSQLTokens().add(new IndexToken(indexNameNode.get().getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNameNode.get().getText()), tableName));
        }
    }

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

@@ -2177,83 +2177,8 @@
 ) %7B%0A
-        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();%0A
     
@@ -2293,32 +2293,33 @@
 E);%0A        if (
+!
 indexNameNode.is
@@ -2327,32 +2327,138 @@
 resent()) %7B%0A    
+        return null;%0A        %7D%0A        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();%0A
         extractR
@@ -2617,27 +2617,8 @@
 ));%0A
-        %7D%0A        %0A
     

extract nothing return null