/*
 * 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.lexer.token.Symbol;
import io.shardingsphere.core.parsing.parser.context.table.Table;
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;
import org.antlr.v4.runtime.ParserRuleContext;

/**
 * Single table name extract handler.
 * 
 * @author duhongjun
 */
public class TableNameExtractHandler implements ASTExtractHandler,ASTExtractHandler1 {
    
    @Override
    public void extract(final ParserRuleContext ancestorNode, final SQLStatement statement) {
        Optional<ParserRuleContext> tableNameNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.TABLE_NAME);
        if (tableNameNode.isPresent()) {
            String tableText = tableNameNode.get().getText();
            int dotPosition = tableText.contains(Symbol.DOT.getLiterals()) ? tableText.lastIndexOf(Symbol.DOT.getLiterals()) : 0;
            statement.getSQLTokens().add(new TableToken(tableNameNode.get().getStart().getStartIndex(), dotPosition, tableText));
            statement.getTables().add(new Table(SQLUtil.getExactlyValue(SQLUtil.getNameWithoutSchema(tableText)), Optional.<String>absent()));
        }
    }

    @Override
    public ExtractResult extract(ParserRuleContext ancestorNode) {
        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();
        Optional<ParserRuleContext> tableNameNode = ASTUtils.findFirstChildNode(ancestorNode, RuleName.TABLE_NAME);
        if (tableNameNode.isPresent()) {
            String tableText = tableNameNode.get().getText();
            int dotPosition = tableText.contains(Symbol.DOT.getLiterals()) ? tableText.lastIndexOf(Symbol.DOT.getLiterals()) : 0;
            extractResult.getSqlTokens().add(new TableToken(tableNameNode.get().getStart().getStartIndex(), dotPosition, tableText));
        }
        
        return extractResult;
    }
}

@@ -2404,83 +2404,8 @@
 ) %7B%0A
-        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();%0A
     
@@ -2520,32 +2520,33 @@
 E);%0A        if (
+!
 tableNameNode.is
@@ -2554,32 +2554,137 @@
 resent()) %7B%0A    
+       return null;%0A        %7D%0A        SQLTokenExtractResult extractResult = new SQLTokenExtractResult();%0A
         String t
@@ -2725,36 +2725,32 @@
 Text();%0A        
- 
-   
 int dotPosition 
@@ -2843,36 +2843,32 @@
 iterals()) : 0;%0A
-    
         extractR
@@ -2985,27 +2985,8 @@
 ));%0A
-        %7D%0A        %0A
     

extract nothing return null