/*
* Copyright 2011, Mysema Ltd
*
* 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 com.mysema.query.jpa;
import javax.annotation.Nullable;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import antlr.RecognitionException;
import antlr.TokenStreamException;
import antlr.collections.AST;
import com.mysema.commons.lang.CloseableIterator;
import com.mysema.query.DefaultQueryMetadata;
import com.mysema.query.QueryMetadata;
import com.mysema.query.SearchResults;
import com.mysema.query.Tuple;
import com.mysema.query.types.Expression;
import org.hibernate.hql.internal.ast.HqlParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.Assert.assertEquals;
class QueryHelper extends JPAQueryBase<QueryHelper> {
private static final Logger logger = LoggerFactory.getLogger(QueryHelper.class);
public QueryHelper(JPQLTemplates templates) {
this(new DefaultQueryMetadata(), templates);
}
public QueryHelper(QueryMetadata metadata, JPQLTemplates templates) {
super(metadata, templates);
}
@Override
protected JPQLSerializer createSerializer() {
return new JPQLSerializer(getTemplates());
}
public long count() {
return 0;
}
@Override
public CloseableIterator<Tuple> iterate(Expression<?>... args) {
throw new UnsupportedOperationException();
}
@Nullable
public <RT> CloseableIterator<RT> iterate(Expression<RT> projection) {
throw new UnsupportedOperationException();
}
@Nullable
public SearchResults<Tuple> listResults(Expression<?>... args) {
throw new UnsupportedOperationException();
}
@Nullable
public <RT> SearchResults<RT> listResults(Expression<RT> expr) {
throw new UnsupportedOperationException();
}
public void parse() throws RecognitionException, TokenStreamException {
try {
String input = toString();
logger.debug("input: " + input.replace('\n', ' '));
HqlParser parser = HqlParser.getInstance(input);
parser.setFilter(false);
parser.statement();
AST ast = parser.getAST();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
parser.showAst(ast, new PrintStream(baos));
assertEquals("At least one error occurred during parsing " + input,
0, parser.getParseErrorHandler().getErrorCount());
} finally {
// clear();
}
}
public QueryHelper select(Expression<?>... exprs) {
queryMixin.addProjection(exprs);
return this;
}
@Override
public <RT> RT uniqueResult(Expression<RT> projection) {
throw new UnsupportedOperationException();
}
@Override
public QueryHelper clone() {
return new QueryHelper(getMetadata().clone(), getTemplates());
}
}