/*
 * 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.util.ASTUtils;
import io.shardingsphere.core.parsing.parser.sql.SQLStatement;
import io.shardingsphere.core.parsing.parser.token.IndexToken;
import io.shardingsphere.core.util.SQLUtil;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.tree.ParseTree;

/**
 * Rename index extract handler.
 * 
 * @author duhongjun
 */
public final class RenameIndexExtractHandler implements ASTExtractHandler {
    
    @Override
    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) {
        Optional<ParserRuleContext> renameIndexNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.RENAME_INDEX);
        if (!renameIndexNode.isPresent() || 4 > renameIndexNode.get().getChildCount()) {
            return;
        }
        ParseTree oldIndexNode = renameIndexNode.get().getChild(2);
        if (!(oldIndexNode instanceof ParserRuleContext)) {
            return;
        }
        ParseTree newIndexNode = renameIndexNode.get().getChild(4);
        if (!(newIndexNode instanceof ParserRuleContext)) {
            return;
        }
        statement.getSQLTokens().add(getIndexToken(statement, (ParserRuleContext) oldIndexNode));
        statement.getSQLTokens().add(getIndexToken(statement, (ParserRuleContext) newIndexNode));
    }
    
    private IndexToken getIndexToken(final SQLStatement statement, final ParserRuleContext indexNode) {
        return new IndexToken(indexNode.getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNode.getText()), statement.getTables().getSingleTableName());
    }
}

@@ -727,16 +727,213 @@
 ptional;
+%0A%0Aimport io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.ExtractResult;%0Aimport io.shardingsphere.core.parsing.antlr.extractor.statement.handler.result.SQLTokenExtractResult;
 %0Aimport 
@@ -1405,16 +1405,35 @@
 tHandler
+,ASTExtractHandler1
  %7B%0A    %0A
@@ -2402,24 +2402,24 @@
 ndexNode) %7B%0A
-
         retu
@@ -2574,11 +2574,1202 @@
 );%0A    %7D
+%0A%0A    @Override%0A    public ExtractResult extract(ParserRuleContext ancestorNode) %7B%0A        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();%0A        Optional%3CParserRuleContext%3E renameIndexNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.RENAME_INDEX);%0A        if (!renameIndexNode.isPresent() %7C%7C 4 %3E renameIndexNode.get().getChildCount()) %7B%0A            return extractResult;%0A        %7D%0A        ParseTree oldIndexNode = renameIndexNode.get().getChild(2);%0A        if (!(oldIndexNode instanceof ParserRuleContext)) %7B%0A            return extractResult;%0A        %7D%0A        ParseTree newIndexNode = renameIndexNode.get().getChild(4);%0A        if (!(newIndexNode instanceof ParserRuleContext)) %7B%0A            return extractResult;%0A        %7D%0A        %0A        extractResult.getSqlTokens().add(getIndexToken((ParserRuleContext) oldIndexNode));%0A        extractResult.getSqlTokens().add(getIndexToken((ParserRuleContext) newIndexNode));%0A        return extractResult;%0A    %7D%0A    %0A    private IndexToken getIndexToken(final ParserRuleContext indexNode) %7B%0A        return new IndexToken(indexNode.getStop().getStartIndex(), SQLUtil.getNameWithoutSchema(indexNode.getText()), null);%0A    %7D
 %0A%7D%0A

implement ASTExtractHandler1