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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.search;
import org.apache.tinkerpop.gremlin.process.traversal.P;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.javatuples.Pair;
import org.onap.aai.exceptions.AAIException;
import org.onap.aai.rest.dsl.DslQueryProcessor;
import org.onap.aai.restcore.search.GroovyQueryBuilderSingleton;
import org.onap.aai.restcore.util.URITools;
import org.onap.aai.serialization.engines.TransactionalGraphEngine;
import org.onap.aai.serialization.queryformats.SubGraphStyle;
import javax.ws.rs.core.MultivaluedHashMap;
import javax.ws.rs.core.MultivaluedMap;
import java.io.FileNotFoundException;
import java.net.URI;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public abstract class GenericQueryProcessor {
protected final Optional<URI> uri;
protected final MultivaluedMap<String, String> queryParams;
protected final Optional<Collection<Vertex>> vertices;
protected static Pattern p = Pattern.compile("query/(.*+)");
protected Optional<String> gremlin;
protected final TransactionalGraphEngine dbEngine;
protected static GroovyQueryBuilderSingleton queryBuilderSingleton = GroovyQueryBuilderSingleton.getInstance();
protected final boolean isGremlin;
protected Optional<DslQueryProcessor> dslQueryProcessorOptional;
/* dsl parameters to store dsl query and to check
* if this is a DSL request
*/
protected Optional<String> dsl;
protected final boolean isDsl ;
protected GenericQueryProcessor(Builder builder) {
this.uri = builder.getUri();
this.dbEngine = builder.getDbEngine();
this.vertices = builder.getVertices();
this.gremlin = builder.getGremlin();
this.isGremlin = builder.isGremlin();
this.dsl = builder.getDsl();
this.isDsl = builder.isDsl();
this.dslQueryProcessorOptional = builder.getDslQueryProcessor();
if (uri.isPresent()) {
queryParams = URITools.getQueryMap(uri.get());
} else {
queryParams = new MultivaluedHashMap<>();
}
}
protected abstract GraphTraversal<?,?> runQuery(String query, Map<String, Object> params);
protected List<Object> processSubGraph(SubGraphStyle style, GraphTraversal<?,?> g) {
final List<Object> resultVertices = new Vector<>();
g.store("y");
if (SubGraphStyle.prune.equals(style) || SubGraphStyle.star.equals(style)) {
g.barrier().bothE();
if (SubGraphStyle.prune.equals(style)) {
g.where(__.otherV().where(P.within("y")));
}
g.dedup().subgraph("subGraph").cap("subGraph").map(x -> (Graph)x.get()).next().traversal().V().forEachRemaining(x -> {
resultVertices.add(x);
});
} else {
resultVertices.addAll(g.toList());
}
return resultVertices;
}
public List<Object> execute(SubGraphStyle style) throws FileNotFoundException, AAIException {
final List<Object> resultVertices;
Pair<String, Map<String, Object>> tuple = this.createQuery();
String query = tuple.getValue0();
Map<String, Object> params = tuple.getValue1();
if (query.equals("") && (vertices.isPresent() && vertices.get().isEmpty())) {
//nothing to do, just exit
return new ArrayList<>();
}
GraphTraversal<?,?> g = this.runQuery(query, params);
resultVertices = this.processSubGraph(style, g);
return resultVertices;
}
protected Pair<String, Map<String, Object>> createQuery() throws AAIException {
Map<String, Object> params = new HashMap<>();
String query = "";
if (this.isGremlin) {
query = gremlin.get();
}else if (this.isDsl) {
String dslUserQuery = dsl.get();
if(dslQueryProcessorOptional.isPresent()){
String dslQuery = dslQueryProcessorOptional.get().parseAaiQuery(dslUserQuery);
query = queryBuilderSingleton.executeTraversal(dbEngine, dslQuery, params);
String startPrefix = "g.V()";
query = startPrefix + query;
}
}
return new Pair<>(query, params);
}
public static class Builder {
private final TransactionalGraphEngine dbEngine;
private Optional<URI> uri = Optional.empty();
private Optional<String> gremlin = Optional.empty();
private boolean isGremlin = false;
private Optional<Collection<Vertex>> vertices = Optional.empty();
private QueryProcessorType processorType = QueryProcessorType.GREMLIN_SERVER;
private Optional<String> dsl = Optional.empty();
private boolean isDsl = false;
private DslQueryProcessor dslQueryProcessor;
public Builder(TransactionalGraphEngine dbEngine) {
this.dbEngine = dbEngine;
}
public Builder queryFrom(URI uri) {
this.uri = Optional.of(uri);
this.isGremlin = false;
return this;
}
public Builder startFrom(Collection<Vertex> vertices) {
this.vertices = Optional.of(vertices);
return this;
}
public Builder queryFrom( String query, String queryType) {
if(queryType.equals("gremlin")){
this.gremlin = Optional.of(query);
this.isGremlin = true;
}
if(queryType.equals("dsl")){
this.dsl = Optional.of(query);
this.isDsl = true;
}
return this;
}
public Builder processWith(QueryProcessorType type) {
this.processorType = type;
return this;
}
public Builder queryProcessor(DslQueryProcessor dslQueryProcessor){
this.dslQueryProcessor = dslQueryProcessor;
return this;
}
public Optional<DslQueryProcessor> getDslQueryProcessor(){
return Optional.ofNullable(this.dslQueryProcessor);
}
public TransactionalGraphEngine getDbEngine() {
return dbEngine;
}
public Optional<URI> getUri() {
return uri;
}
public Optional<String> getGremlin() {
return gremlin;
}
public boolean isGremlin() {
return isGremlin;
}
public Optional<String> getDsl() {
return dsl;
}
public boolean isDsl() {
return isDsl;
}
public Optional<Collection<Vertex>> getVertices() {
return vertices;
}
public QueryProcessorType getProcessorType() {
return processorType;
}
public GenericQueryProcessor create() {
return new GroovyShellImpl(this);
}
}
}
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