/*
 * 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.mysql;

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.lexer.token.Symbol;
import io.shardingsphere.core.parsing.parser.sql.SQLStatement;
import io.shardingsphere.core.parsing.parser.token.IndexToken;
import io.shardingsphere.core.parsing.parser.token.TableToken;
import io.shardingsphere.core.util.SQLUtil;

/**
 * Add index extract handler for MySQL.
 * 
 * @author duhongjun
 */
public final class MySQLAddIndexExtractHandler implements ASTExtractHandler,ASTExtractHandler1 {
    
    @Override
    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) {
        for (ParserRuleContext each : ASTUtils.getAllDescendantNodes(ancestorNode, RuleName.ADD_INDEX)) {
            Optional<ParserRuleContext> indexNameNode = ASTUtils.findFirstChildNode(each, 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) {
        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();
        for (ParserRuleContext each : ASTUtils.getAllDescendantNodes(ancestorNode, RuleName.ADD_INDEX)) {
            Optional<ParserRuleContext> indexNameNode = ASTUtils.findFirstChildNode(each, RuleName.INDEX_NAME);
            if (indexNameNode.isPresent()) {
                extractResult.getSqlTokens().add(
                        new IndexToken(indexNameNode.get().getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNameNode.get().getText()), null));
            }
        }
        return extractResult;
    }
}

@@ -698,24 +698,54 @@
 ect.mysql;%0A%0A
+import java.util.Collection;%0A%0A
 import org.a
@@ -1365,66 +1365,8 @@
 ls;%0A
-import io.shardingsphere.core.parsing.lexer.token.Symbol;%0A
 impo
@@ -1491,71 +1491,8 @@
 en;%0A
-import io.shardingsphere.core.parsing.parser.token.TableToken;%0A
 impo
@@ -2425,24 +2425,203 @@
 storNode) %7B%0A
+        Collection%3CParserRuleContext%3E result = ASTUtils.getAllDescendantNodes(ancestorNode, RuleName.ADD_INDEX);%0A        if(result.isEmpty()) %7B%0A            return null;%0A        %7D%0A
         SQLT
@@ -2725,72 +2725,14 @@
 h : 
-ASTUtils.getAllDescendantNodes(ancestorNode, RuleName.ADD_INDEX)
+result
 ) %7B%0A

extract nothing return null