/*
* Copyright 2008 Udai Gupta, Ralf Joachim
*
* 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.
*/
package org.castor.cpa.query.castorql;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.castor.cpa.query.AbstractParser;
import org.castor.cpa.query.ParseException;
import org.castor.cpa.query.TokenManagerError;
import org.castor.cpa.query.QueryObject;
/**
* Class that implements abstract parser generator.
*
* @author <a href="mailto:mailtoud AT gmail DOT com">Udai Gupta</a>
* @author <a href="mailto:ralf DOT joachim AT syscon DOT eu">Ralf Joachim</a>
* @version $Revision: 7121 $ $Date: 2006-04-25 16:09:10 -0600 (Tue, 25 Apr 2006) $
* @since 1.3
*/
public final class CastorQLParserAdapter extends AbstractParser {
// --------------------------------------------------------------------------
/**
* {@inheritDoc}
*
* @throws UnsupportedEncodingException
* @throws ParseException
*/
public QueryObject parse(final String oql)
throws UnsupportedEncodingException, ParseException {
CastorQLParser parser = null;
CastorQLParserTokenManager tkmgr = null;
try {
tkmgr = createTkmgr(oql);
parser = new CastorQLParser(tkmgr);
SimpleNode root = parser.castorQL();
CastorQLTreeWalker tw = new CastorQLTreeWalker(root);
return tw.getSelect();
} catch (org.castor.cpa.query.castorql.ParseException e) {
parser.ReInit(tkmgr);
throw new ParseException(e);
} catch (org.castor.cpa.query.castorql.TokenMgrError e) {
// parser.ReInit(tkmgr);
throw new TokenManagerError(e);
}
}
// --------------------------------------------------------------------------
/**
* Gets the root SimpleNode instance of JJTREE.
*
* @param oql the query string
* @return the root SimpleNode of JJTREE
* @throws UnsupportedEncodingException the unsupported encoding exception of query string
* @throws ParseException the QL parse exception
*/
public SimpleNode getSimpleNode(final String oql)
throws UnsupportedEncodingException, ParseException {
CastorQLParser parser = null;
CastorQLParserTokenManager tkmgr = null;
try {
tkmgr = createTkmgr(oql);
parser = new CastorQLParser(tkmgr);
return parser.castorQL();
} catch (org.castor.cpa.query.castorql.ParseException e) {
parser.ReInit(tkmgr);
throw new ParseException(e);
} catch (org.castor.cpa.query.castorql.TokenMgrError e) {
// parser.ReInit(tkmgr);
throw new TokenManagerError(e);
}
}
// --------------------------------------------------------------------------
/**
* Creates the TokenManager instance.
*
* @param oql the query string
* @return the castor ql parser token manager
* @throws UnsupportedEncodingException the unsupported encoding exception
*/
public CastorQLParserTokenManager createTkmgr(final String oql)
throws UnsupportedEncodingException {
StringBuffer stringBuffer = new StringBuffer(oql);
InputStream bis = new ByteArrayInputStream(stringBuffer.toString()
.getBytes("UTF-8"));
InputStreamReader isr = new InputStreamReader(bis, "UTF-8");
SimpleCharStream jSt = new SimpleCharStream(isr);
return new CastorQLParserTokenManager(jSt);
}
// --------------------------------------------------------------------------
}