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/*-
* ============LICENSE_START=======================================================
* ONAP : CCSDK
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights
* reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.ccsdk.sli.core.sli;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.onap.ccsdk.sli.core.sli.ExprGrammarParser.ExprContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SvcLogicExpressionFactory {
private static final Logger LOG = LoggerFactory
.getLogger(SvcLogicExpressionFactory.class);
public static SvcLogicExpression parse(String exprStr) throws IOException
{
InputStream exprStream = new ByteArrayInputStream(exprStr.getBytes());
CharStream input = new ANTLRInputStream(exprStream);
ExprGrammarLexer lexer = new ExprGrammarLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
ExprGrammarParser parser = new ExprGrammarParser(tokens);
lexer.removeErrorListeners();
lexer.addErrorListener(SvcLogicExprParserErrorListener.getInstance());
parser.removeErrorListeners();
parser.addErrorListener(SvcLogicExprParserErrorListener.getInstance());
ExprContext expression = null;
try {
expression = parser.expr();
} catch (Exception e) {
String errorMsg = e.getMessage();
LOG.error(errorMsg);
throw new SvcLogicParserException(errorMsg);
}
ParseTreeWalker walker = new ParseTreeWalker();
SvcLogicExprListener listener = new SvcLogicExprListener();
walker.walk(listener, expression);
return(listener.getParsedExpr());
}
}
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