| /* |
| * 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.rya.indexing.pcj.fluo.client.util; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.io.IOException; |
| import java.util.HashSet; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import edu.umd.cs.findbugs.annotations.DefaultAnnotation; |
| import edu.umd.cs.findbugs.annotations.NonNull; |
| import net.jcip.annotations.Immutable; |
| |
| import org.apache.commons.lang3.builder.EqualsBuilder; |
| import org.apache.rya.indexing.pcj.storage.accumulo.VariableOrder; |
| |
| /** |
| * Represents a request to create a new PCJ in the Fluo app. |
| */ |
| @Immutable |
| @DefaultAnnotation(NonNull.class) |
| public class ParsedQueryRequest { |
| |
| private final String sparql; |
| private final Set<VariableOrder> varOrders; |
| |
| /** |
| * Constructs an instance of {@link CratePcjRequest}. |
| * |
| * @param sparql - The SPARQL query to load into the Fluo app. (not null) |
| * @param varOrders - The variable orders to export the query's results to. (not null) |
| */ |
| public ParsedQueryRequest(final String sparql, final Set<VariableOrder> varOrders) { |
| this.sparql = checkNotNull(sparql); |
| this.varOrders = checkNotNull(varOrders); |
| } |
| |
| /** |
| * @return The variable orders to export the query's results to. (not null) |
| */ |
| public Set<VariableOrder> getVarOrders() { |
| return varOrders; |
| } |
| |
| /** |
| * @return The SPARQL query to load into the Fluo app. |
| */ |
| public String getQuery() { |
| return sparql; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(sparql, varOrders); |
| } |
| |
| @Override |
| public boolean equals(final Object o) { |
| if(this == o) { |
| return true; |
| } |
| if(o instanceof ParsedQueryRequest) { |
| final ParsedQueryRequest request = (ParsedQueryRequest)o; |
| return new EqualsBuilder() |
| .append(sparql, request.sparql) |
| .append(varOrders, request.varOrders) |
| .isEquals(); |
| } |
| return false; |
| } |
| |
| private static final Pattern varOrdersPattern = Pattern.compile("^#prefix (.*?)$", Pattern.MULTILINE); |
| |
| /** |
| * Create a {@link ParsedQueryRequest} from formatted text. |
| * <p> |
| * The file may contain a list of variable orders at the head as comments. |
| * The file must contain a SPARQL query to loAd into the application. |
| * <p> |
| * Example file: |
| * <pre> |
| * #prefix a, b, c |
| * #prefix b, c, a |
| * SELECT * |
| * WHERE { |
| * ?a <http://talksTo> ?b. |
| * ?b <http://talksTo> ?c. |
| * } |
| * </pre> |
| * @throws IOException |
| */ |
| public static ParsedQueryRequest parse(final String requestText) throws IOException { |
| checkNotNull(requestText); |
| |
| // Shift this pointer to the end of each match to find where the SPARQL starts. |
| int startOfSparql = 0; |
| |
| // Scan for variable orders. |
| final Set<VariableOrder> varOrders = new HashSet<>(); |
| |
| final Matcher matcher = varOrdersPattern.matcher(requestText); |
| while(matcher.find()) { |
| final String varOrder = matcher.group(1); |
| varOrders.add( new VariableOrder( varOrder.split(",\\s*") ) ); |
| |
| startOfSparql = matcher.end(); |
| } |
| |
| // Pull the SPARQL out. |
| final String sparql = requestText.substring(startOfSparql).trim(); |
| |
| return new ParsedQueryRequest(sparql, varOrders); |
| } |
| } |