/*
* Copyright (c) 2011. The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.hadoop.hbase.hbql.parser;
import org.antlr.runtime.ANTLRStringStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.Lexer;
import org.antlr.runtime.RecognitionException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.expreval.client.InternalErrorException;
import org.apache.expreval.client.LexerRecognitionException;
import org.apache.expreval.client.NullColumnValueException;
import org.apache.expreval.client.ResultMissingColumnException;
import org.apache.expreval.expr.ExpressionTree;
import org.apache.expreval.expr.node.GenericValue;
import org.apache.hadoop.hbase.hbql.antlr.HBqlLexer;
import org.apache.hadoop.hbase.hbql.antlr.HBqlParser;
import org.apache.hadoop.hbase.hbql.client.HBqlException;
import org.apache.hadoop.hbase.hbql.impl.ParseException;
import org.apache.hadoop.hbase.hbql.mapping.Mapping;
import org.apache.hadoop.hbase.hbql.mapping.MappingContext;
import org.apache.hadoop.hbase.hbql.statement.HBqlStatement;
import org.apache.hadoop.hbase.hbql.statement.args.WithArgs;
import org.apache.hadoop.hbase.hbql.statement.select.SelectExpressionContext;
import java.util.List;
import java.util.Map;
public class ParserUtil {
private static final Log log = LogFactory.getLog(ParserUtil.class.getName());
public static HBqlParser newHBqlParser(final String sql) throws ParseException {
try {
log.debug("Parsing: " + sql);
final Lexer lex = new HBqlLexer(new ANTLRStringStream(sql));
final CommonTokenStream tokens = new CommonTokenStream(lex);
return new HBqlParser(tokens);
}
catch (LexerRecognitionException e) {
throw new ParseException(e.getRecognitionExecption(), e.getMessage());
}
}
public static ExpressionTree parseWhereExpression(final String sql,
final MappingContext mappingContext) throws HBqlException {
try {
return getExpressionTree(sql, mappingContext);
}
catch (RecognitionException e) {
e.printStackTrace();
throw new HBqlException("Error parsing: " + sql);
}
}
public static ExpressionTree getExpressionTree(final String str,
final MappingContext mappingContext) throws HBqlException,
RecognitionException {
final Mapping mapping = mappingContext.getMapping();
final Map<String, ExpressionTree> map = mapping.getEvalMap();
ExpressionTree expressionTree = map.get(str);
if (expressionTree == null) {
final HBqlParser parser = ParserUtil.newHBqlParser(str);
expressionTree = parser.nodescWhereExpr();
expressionTree.setMappingContext(mappingContext);
mapping.addToExpressionTreeCache(str, expressionTree);
}
else {
expressionTree.reset();
}
return expressionTree;
}
public static Object parseExpression(final String sql) throws HBqlException {
try {
final HBqlParser parser = ParserUtil.newHBqlParser(sql);
final GenericValue valueExpr = parser.exprValue();
valueExpr.validateTypes(null, false);
return valueExpr.getValue(null, null);
}
catch (ResultMissingColumnException e) {
// No column refs should be missing
throw new InternalErrorException("Missing column: " + e.getMessage());
}
catch (NullColumnValueException e) {
throw new InternalErrorException("Null value: " + e.getMessage());
}
catch (RecognitionException e) {
e.printStackTrace();
throw new ParseException(e, sql);
}
}
public static SelectExpressionContext parseSelectElement(final String sql) throws HBqlException {
try {
final HBqlParser parser = ParserUtil.newHBqlParser(sql);
final SelectExpressionContext elem = (SelectExpressionContext)parser.selectElem();
elem.setMappingContext(null);
return elem;
}
catch (RecognitionException e) {
e.printStackTrace();
throw new ParseException(e, sql);
}
}
public static Object evaluateSelectElement(final SelectExpressionContext elem) throws HBqlException {
return elem.getValue(null, null);
}
public static WithArgs parseWithClause(final String sql) throws ParseException {
try {
final HBqlParser parser = ParserUtil.newHBqlParser(sql);
return parser.withClause();
}
catch (RecognitionException e) {
e.printStackTrace();
throw new ParseException(e, sql);
}
}
public static List<HBqlStatement> parseConsoleStatements(final String sql) throws HBqlException {
try {
final HBqlParser parser = ParserUtil.newHBqlParser(sql);
final List<HBqlStatement> stmts = parser.consoleStatements();
for (final HBqlStatement stmt : stmts)
stmt.validate();
return stmts;
}
catch (LexerRecognitionException e) {
throw new ParseException(e.getRecognitionExecption(), sql);
}
catch (RecognitionException e) {
throw new ParseException(e, sql);
}
}
public static HBqlStatement parseHBqlStatement(final String sql) throws HBqlException {
try {
final HBqlParser parser = ParserUtil.newHBqlParser(sql + ";");
final HBqlStatement stmt = parser.hbqlStatement();
stmt.validate();
return stmt;
}
catch (LexerRecognitionException e) {
throw new ParseException(e.getRecognitionExecption(), sql);
}
catch (RecognitionException e) {
throw new ParseException(e, sql);
}
}
}