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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2017-2018 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.aai.rest.dsl;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.onap.aai.AAIDslLexer;
import org.onap.aai.AAIDslParser;
import org.onap.aai.rest.dsl.DslListener;
import org.antlr.v4.runtime.Token;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
/**
* The Class DslQueryProcessor.
*/
public class DslQueryProcessor {
private static final EELFLogger LOGGER = EELFManager.getInstance().getLogger(DslQueryProcessor.class);
public String parseAaiQuery(String aaiQuery) {
try {
// Create a input stream that reads our string
InputStream stream = new ByteArrayInputStream(aaiQuery.getBytes(StandardCharsets.UTF_8));
// Create a lexer from the input CharStream
AAIDslLexer lexer = new AAIDslLexer(CharStreams.fromStream(stream, StandardCharsets.UTF_8));
// Get a list of tokens pulled from the lexer
CommonTokenStream tokens = new CommonTokenStream(lexer);
// Parser that feeds off of the tokens buffer
AAIDslParser parser = new AAIDslParser(tokens);
// Specify our entry point
ParseTree ptree = parser.aaiquery();
LOGGER.info("QUERY-interim" + ptree.toStringTree(parser));
// Walk it and attach our listener
ParseTreeWalker walker = new ParseTreeWalker();
DslListener listener = new DslListener();
walker.walk(listener, ptree);
LOGGER.info("Final QUERY" + listener.query);
/*
* TODO - Visitor patternQueryDslVisitor visitor = new
* QueryDslVisitor(); String query = visitor.visit(ptree);
*
*/
return listener.query;
} catch (Exception e) {
LOGGER.error("Error while processing the query"+e.getMessage());
}
return "";
}
public static class Builder {
/*
* Builder constructor doesnt do anything
*/
public Builder() {
// Do nothing
}
public String build(String aaiQuery) {
return new DslQueryProcessor().parseAaiQuery(aaiQuery);
}
}
}
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