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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.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.List;
import org.antlr.v4.runtime.tree.TerminalNode;
import org.onap.aai.AAIDslParser;
import org.onap.aai.edges.EdgeRuleQuery;
import org.onap.aai.edges.enums.EdgeType;
import org.onap.aai.exceptions.AAIException;
import org.springframework.beans.factory.annotation.Autowired;
import org.onap.aai.AAIDslBaseListener;
import org.onap.aai.edges.EdgeIngestor;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
/**
* The Class DslListener.
*/
public class DslListener extends AAIDslBaseListener {
private static final EELFLogger LOGGER = EELFManager.getInstance().getLogger(DslQueryProcessor.class);
private final EdgeIngestor edgeRules;
DslContext context = null;
DslQueryBuilder dslBuilder = null;
/**
* Instantiates a new DslListener.
*/
@Autowired
public DslListener(EdgeIngestor edgeIngestor) {
this.edgeRules = edgeIngestor;
context = new DslContext();
dslBuilder = new DslQueryBuilder(edgeIngestor);
}
public String getQuery() {
return dslBuilder.getQuery().toString();
}
@Override
public void enterAaiquery(AAIDslParser.AaiqueryContext ctx) {
dslBuilder.start();
}
@Override
public void exitAaiquery(AAIDslParser.AaiqueryContext ctx) {
dslBuilder.end(context);
}
@Override
public void enterDslStatement(AAIDslParser.DslStatementContext ctx) {
if (context.isUnionStart()) {
dslBuilder.startUnion();
}
}
@Override
public void exitDslStatement(AAIDslParser.DslStatementContext ctx) {
if (context.isUnionQuery()) {
dslBuilder.comma(context);
context.setUnionStart(true);
}
}
@Override
public void enterSingleNodeStep(AAIDslParser.SingleNodeStepContext ctx) {
try {
/*
* Set the previous Node to current node and get the new current
* node
*/
context.setPreviousNode(context.getCurrentNode());
context.setCurrentNode(ctx.NODE().getText());
if (context.isUnionQuery() || context.isTraversal() || context.isWhereQuery()) {
String oldPreviousNode = context.getPreviousNode();
if (context.isUnionStart()) {
String previousNode = context.getUnionStartNodes().peek();
context.setPreviousNode(previousNode);
context.setUnionStart(false);
}
dslBuilder.edgeQuery(context);
/*
* Reset is required bcos for union queries im changing the
* context
*/
context.setPreviousNode(oldPreviousNode);
}
else {
dslBuilder.nodeQuery(context);
}
} catch (AAIException e) {
LOGGER.info("AAIException in DslListener" + e.getMessage());
}
}
@Override
public void exitSingleNodeStep(AAIDslParser.SingleNodeStepContext ctx) {
context.setCtx(ctx);
dslBuilder.store(context);
}
private void generateExitStep() {
}
@Override
public void enterUnionQueryStep(AAIDslParser.UnionQueryStepContext ctx) {
Deque<String> unionStartNodes = context.getUnionStartNodes();
unionStartNodes.add(context.getCurrentNode());
context.setUnionStart(true);
/*
* I may not need this
*/
context.setUnionQuery(true);
dslBuilder.union(context);
}
@Override
public void exitUnionQueryStep(AAIDslParser.UnionQueryStepContext ctx) {
context.setUnionStart(false);
context.setUnionQuery(false);
Deque<String> unionStartNodes = context.getUnionStartNodes();
if (unionStartNodes.peek() != null) {
unionStartNodes.pop();
}
dslBuilder.endUnion(context);
}
@Override
public void enterFilterTraverseStep(AAIDslParser.FilterTraverseStepContext ctx) {
context.setWhereQuery(true);
context.setWhereStartNode(context.getCurrentNode());
dslBuilder.where(context);
}
@Override
public void exitFilterTraverseStep(AAIDslParser.FilterTraverseStepContext ctx) {
context.setWhereQuery(false);
context.setCurrentNode(context.getWhereStartNode());
dslBuilder.endWhere(context);
}
@Override
public void enterFilterStep(AAIDslParser.FilterStepContext ctx) {
context.setCtx(ctx);
dslBuilder.filter(context);
}
@Override
public void exitFilterStep(AAIDslParser.FilterStepContext ctx) {
// For now do nothing
}
@Override
public void enterTraverseStep(AAIDslParser.TraverseStepContext ctx) {
context.setTraversal(true);
}
@Override
public void exitTraverseStep(AAIDslParser.TraverseStepContext ctx) {
context.setTraversal(false);
}
@Override
public void enterLimitStep(AAIDslParser.LimitStepContext ctx) {
context.setCtx(ctx);
dslBuilder.limit(context);
}
}
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