| /* |
| * 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.request.json; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.solr.common.SolrException; |
| |
| public class ObjectUtil { |
| |
| public static class ConflictHandler { |
| protected boolean isList(Map<String,Object> container, List<String> path, String key, Object current, Object previous) { |
| return key!=null && ("fields".equals(key) || "filter".equals(key)); |
| } |
| |
| public void handleConflict(Map<String,Object> container, List<String> path, String key, Object current, Object previous) { |
| boolean handleAsList = isList(container, path, key, current, previous); |
| if (handleAsList) { |
| container.put(key, makeList(current, previous) ); |
| return; |
| } |
| |
| if (previous instanceof Map && current instanceof Map) { |
| @SuppressWarnings({"unchecked"}) |
| Map<String,Object> prevMap = (Map<String,Object>)previous; |
| @SuppressWarnings({"unchecked"}) |
| Map<String,Object> currMap = (Map<String,Object>)current; |
| if (prevMap.size() == 0) return; |
| mergeMap(prevMap, currMap, path); |
| container.put(key, prevMap); |
| return; |
| } |
| |
| // if we aren't handling as a list, and we aren't handling as a map, then just overwrite (i.e. nothing else to do) |
| return; |
| } |
| |
| |
| // merges srcMap onto targetMap (i.e. changes targetMap but not srcMap) |
| public void mergeMap(Map<String,Object> targetMap, Map<String,Object> srcMap, List<String> path) { |
| if (srcMap.size() == 0) return; |
| // to keep ordering correct, start with prevMap and merge in currMap |
| for (Map.Entry<String,Object> srcEntry : srcMap.entrySet()) { |
| String subKey = srcEntry.getKey(); |
| Object subVal = srcEntry.getValue(); |
| Object subPrev = targetMap.put(subKey, subVal); |
| if (subPrev != null) { |
| // recurse |
| path.add(subKey); |
| handleConflict(targetMap, path, subKey, subVal, subPrev); |
| path.remove(path.size()-1); |
| } |
| } |
| } |
| |
| protected Object makeList(Object current, Object previous) { |
| @SuppressWarnings({"rawtypes"}) |
| ArrayList lst = new ArrayList(); |
| append(lst, previous); // make the original value(s) come first |
| append(lst, current); |
| return lst; |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| protected void append(@SuppressWarnings({"rawtypes"})List lst, Object current) { |
| if (current instanceof Collection) { |
| lst.addAll((Collection)current); |
| } else { |
| lst.add(current); |
| } |
| } |
| |
| } |
| |
| public static void mergeObjects(Map<String,Object> top, List<String> path, Object val, ConflictHandler handler) { |
| Map<String,Object> outer = top; |
| for (int i=0; i<path.size()-1; i++) { |
| @SuppressWarnings({"unchecked"}) |
| Map<String,Object> sub = (Map<String,Object>)outer.get(path.get(i)); |
| if (sub == null) { |
| sub = new LinkedHashMap<String,Object>(); |
| outer.put(path.get(i), sub); |
| } |
| outer = sub; |
| } |
| |
| String key = path.size() > 0 ? path.get(path.size()-1) : null; |
| |
| if (key != null) { |
| Object existingVal = outer.put(key, val); |
| if (existingVal != null) { |
| // OK, now we need to merge values |
| handler.handleConflict(outer, path, key, val, existingVal); |
| } |
| } else if (val instanceof Map) { |
| // merging at top level... |
| @SuppressWarnings({"unchecked"}) |
| Map<String,Object> newMap = (Map<String,Object>)val; |
| handler.mergeMap(outer, newMap, path); |
| } else { |
| // todo: find a way to return query param in error message |
| throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, |
| "Expected JSON Object but got " + val.getClass().getSimpleName() + "=" + val); |
| } |
| } |
| |
| } |