| /* |
| * 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.solr.response; |
| |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.io.Writer; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| import org.apache.solr.client.solrj.io.graph.Traversal; |
| import org.apache.solr.client.solrj.io.stream.TupleStream; |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.common.util.NamedList; |
| import org.apache.solr.handler.GraphHandler; |
| import org.apache.solr.request.SolrQueryRequest; |
| |
| |
| public class GraphMLResponseWriter implements QueryResponseWriter { |
| |
| public void init(@SuppressWarnings({"rawtypes"})NamedList args) { |
| /* NOOP */ |
| } |
| |
| public String getContentType(SolrQueryRequest req, SolrQueryResponse res) { |
| return "application/xml"; |
| } |
| |
| public void write(Writer writer, SolrQueryRequest req, SolrQueryResponse res) throws IOException { |
| |
| Exception e1 = res.getException(); |
| if(e1 != null) { |
| e1.printStackTrace(new PrintWriter(writer)); |
| return; |
| } |
| |
| TupleStream stream = (TupleStream)req.getContext().get("stream"); |
| |
| if(stream instanceof GraphHandler.DummyErrorStream) { |
| GraphHandler.DummyErrorStream d = (GraphHandler.DummyErrorStream)stream; |
| Exception e = d.getException(); |
| e.printStackTrace(new PrintWriter(writer)); |
| return; |
| } |
| |
| |
| Traversal traversal = (Traversal)req.getContext().get("traversal"); |
| PrintWriter printWriter = new PrintWriter(writer); |
| |
| try { |
| |
| stream.open(); |
| |
| Tuple tuple = null; |
| |
| int edgeCount = 0; |
| |
| printWriter.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
| printWriter.println("<graphml xmlns=\"http://graphml.graphdrawing.org/xmlns\" "); |
| printWriter.println("xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" "); |
| printWriter.print("xsi:schemaLocation=\"http://graphml.graphdrawing.org/xmlns "); |
| printWriter.println("http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd\">"); |
| |
| printWriter.println("<graph id=\"G\" edgedefault=\"directed\">"); |
| |
| while (true) { |
| //Output the graph |
| tuple = stream.read(); |
| if (tuple.EOF) { |
| break; |
| } |
| |
| String id = tuple.getString("node"); |
| |
| if (traversal.isMultiCollection()) { |
| id = tuple.getString("collection") + "." + id; |
| } |
| |
| printWriter.write("<node id=\""+ xmlEscape(id)+"\""); |
| |
| List<String> outfields = new ArrayList<>(); |
| Iterator<Object> keys = tuple.getFields().keySet().iterator(); |
| while(keys.hasNext()) { |
| String key = String.valueOf(keys.next()); |
| if(key.equals("node") || key.equals("ancestors") || key.equals("collection")) { |
| continue; |
| } else { |
| outfields.add(key); |
| } |
| } |
| |
| if (outfields.size() > 0) { |
| printWriter.println(">"); |
| for (String nodeAttribute : outfields) { |
| Object o = tuple.get(nodeAttribute); |
| if (o != null) { |
| printWriter.println("<data key=\"" + xmlEscape(nodeAttribute) + "\">" + xmlEscape(o.toString()) + "</data>"); |
| } |
| } |
| printWriter.println("</node>"); |
| } else { |
| printWriter.println("/>"); |
| } |
| |
| List<String> ancestors = tuple.getStrings("ancestors"); |
| |
| if(ancestors != null) { |
| for (String ancestor : ancestors) { |
| ++edgeCount; |
| printWriter.write("<edge id=\"" + edgeCount + "\" "); |
| printWriter.write(" source=\"" + xmlEscape(ancestor) + "\" "); |
| printWriter.println(" target=\"" + xmlEscape(id) + "\"/>"); |
| } |
| } |
| } |
| |
| printWriter.write("</graph></graphml>"); |
| } finally { |
| stream.close(); |
| } |
| } |
| |
| private String xmlEscape(String s) { |
| if(s.indexOf(">") > -1) { |
| s = s.replace(">", ">"); |
| } |
| |
| if(s.indexOf("<") > -1) { |
| s = s.replace("<", "<"); |
| } |
| |
| if(s.indexOf("\"")> -1) { |
| s = s.replace("\"", """); |
| } |
| |
| if(s.indexOf("'") > -1) { |
| s = s.replace("'", "'"); |
| } |
| |
| if(s.indexOf("&") > -1) { |
| s = s.replace("&", "&"); |
| } |
| |
| return s; |
| } |
| } |