/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.jena.fuseki.validation ;
import org.apache.jena.atlas.io.IndentedLineBuffer ;
import org.apache.jena.atlas.json.JsonBuilder ;
import org.apache.jena.atlas.json.JsonObject ;
import org.apache.jena.fuseki.servlets.ServletOps ;
import org.apache.jena.query.Query ;
import org.apache.jena.query.QueryFactory ;
import org.apache.jena.query.QueryParseException ;
import org.apache.jena.query.Syntax ;
import org.apache.jena.sparql.algebra.Algebra ;
import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.serializer.SerializationContext ;
public class QueryValidator extends ValidatorBaseJson {
private static final long serialVersionUID = 5113754839333382031L;
public QueryValidator() {}
@Override
protected String validatorName() {
return "SPARQL Query" ;
}
static final String paramQuery = "query" ;
static final String paramSyntax = "languageSyntax" ;
static final String jInput = "input" ;
static final String jFormatted = "formatted" ;
static final String jAlgebra = "algebra" ;
static final String jAlgebraQuads = "algebra-quads" ;
static final String jAlgebraOpt = "algebra-opt" ;
static final String jAlgebraOptQuads = "algebra-opt-quads" ;
@Override
protected JsonObject execute(ValidationAction action) {
JsonBuilder obj = new JsonBuilder() ;
obj.startObject() ;
final String queryString = getArg(action, paramQuery) ;
String querySyntax = getArgOrNull(action, paramSyntax) ;
if ( querySyntax == null || querySyntax.equals("") )
querySyntax = "SPARQL" ;
Syntax language = Syntax.lookup(querySyntax) ;
if ( language == null ) {
ServletOps.errorBadRequest("Unknown syntax: " + querySyntax) ;
return null ;
}
boolean outputSPARQL = true ;
boolean outputAlgebra = true ;
boolean outputQuads = true ;
boolean outputOptimized = true ;
boolean outputOptimizedQuads = true ;
obj.key(jInput).value(queryString) ;
// Attempt to parse it.
Query query = null ;
try {
query = QueryFactory.create(queryString, "http://example/base/", language) ;
} catch (QueryParseException ex) {
obj.key(jErrors) ;
obj.startArray() ; // Errors array
obj.startObject() ;
obj.key(jParseError).value(ex.getMessage()) ;
obj.key(jParseErrorLine).value(ex.getLine()) ;
obj.key(jParseErrorCol).value(ex.getColumn()) ;
obj.finishObject() ;
obj.finishArray() ;
obj.finishObject() ; // Outer object
return obj.build().getAsObject() ;
}
if ( query != null ) {
if ( outputSPARQL )
formatted(obj, query) ;
if ( outputAlgebra )
algebra(obj, query) ;
if ( outputQuads )
algebraQuads(obj, query) ;
if ( outputOptimized )
algebraOpt(obj, query) ;
if ( outputOptimizedQuads )
algebraOptQuads(obj, query) ;
}
obj.finishObject() ;
return obj.build().getAsObject() ;
}
private void formatted(JsonBuilder obj, Query query) {
IndentedLineBuffer out = new IndentedLineBuffer() ;
query.serialize(out) ;
obj.key(jFormatted).value(out.asString()) ;
}
private void algebra(JsonBuilder obj, Query query) {
Op op = Algebra.compile(query) ;
obj.key(jAlgebra).value(string(query, op)) ;
}
private void algebraQuads(JsonBuilder obj, Query query) {
Op op = Algebra.compile(query) ;
op = Algebra.toQuadForm(op) ;
obj.key(jAlgebraQuads).value(string(query, op)) ;
}
private void algebraOpt(JsonBuilder obj, Query query) {
Op op = Algebra.compile(query) ;
op = Algebra.optimize(op) ;
obj.key(jAlgebraOpt).value(string(query, op)) ;
}
private void algebraOptQuads(JsonBuilder obj, Query query) {
Op op = Algebra.compile(query) ;
op = Algebra.toQuadForm(op) ;
op = Algebra.optimize(op) ;
obj.key(jAlgebraOptQuads).value(string(query, op)) ;
}
private String string(Query query, Op op) {
final SerializationContext sCxt = new SerializationContext(query) ;
IndentedLineBuffer out = new IndentedLineBuffer() ;
op.output(out, sCxt) ;
return out.asString() ;
}
}