DataValidator.java

/**
 * 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 static org.apache.jena.riot.SysRIOT.fmtMessage ;

import java.io.StringReader ;
import java.util.ArrayList ;
import java.util.List ;

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.riot.* ;
import org.apache.jena.riot.system.ErrorHandler ;
import org.apache.jena.riot.system.StreamRDF ;
import org.apache.jena.riot.system.StreamRDFLib ;

public class DataValidator extends ValidatorBaseJson {
    private static final long serialVersionUID = -7052864052858485344L;

    public DataValidator() { }
  
    static final String jInput           = "input" ;

    static final String paramFormat           = "outputFormat" ;
    static final String paramIndirection      = "url" ;
    static final String paramData             = "data" ;
    static final String paramSyntax           = "languageSyntax" ;
    @Override
    protected JsonObject execute(ValidationAction action) {
        JsonBuilder obj = new JsonBuilder() ;
        obj.startObject() ;
        
        
        String syntax = getArgOrNull(action, paramSyntax) ;
        if ( syntax == null || syntax.equals("") )
            syntax = RDFLanguages.NQUADS.getName() ;

        Lang language = RDFLanguages.shortnameToLang(syntax) ;
        if ( language == null ) {
            ServletOps.errorBadRequest("Unknown syntax: " + syntax) ;
            return null ;
        }

        String string = getArg(action, paramData) ;
        StringReader sr = new StringReader(string) ;
        obj.key(jInput).value(string) ;
        StreamRDF dest = StreamRDFLib.sinkNull() ;
        
        try {
            // Set error handler!
            RDFDataMgr.parse(dest, sr, null, language) ;
        } catch (RiotParseException 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.getCol()) ;
            obj.finishObject() ;
            obj.finishArray() ;
            
            obj.finishObject() ; // Outer object
            return obj.build().getAsObject() ;
        } catch (RiotException ex) {
            obj.key(jErrors) ;

            obj.startArray() ;      // Errors array
            obj.startObject() ;
            obj.key(jParseError).value(ex.getMessage()) ;
            obj.finishObject() ;
            obj.finishArray() ;
            
            obj.finishObject() ; // Outer object
            return obj.build().getAsObject() ;
        }

        
        obj.finishObject() ;
        return obj.build().getAsObject() ;
    }
    @Override
    protected String validatorName() {
        return "RDF Data" ;
    }
    
    // Error handler that records messages
    private static class ErrorHandlerMsg implements ErrorHandler
    {
        private List<String> messages = new ArrayList<>() ;

        ErrorHandlerMsg(List<String> messages) { this.messages = messages; }
        
        @Override
        public void warning(String message, long line, long col)
        { output(message, line, col, "Warning", "warning") ; }
    
        // Attempt to continue.
        @Override
        public void error(String message, long line, long col)
        { output(message, line, col, "Error", "error") ; }
    
        @Override
        public void fatal(String message, long line, long col)
        { output(message, line, col, "Fatal", "error") ; throw new RiotException(fmtMessage(message, line, col)) ; }
        
        private void output(String message, long line, long col, String typeName, String className)
        {
            String str = fmtMessage(message, line, col) ;
            messages.add(str) ;
        }
    }

}