Java tutorial
/* * Copyright (c) 2016 IBM Corp. All rights reserved. * * Licensed 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 com.cloudant.client.internal.util; import com.cloudant.client.api.model.Index; import com.cloudant.client.api.model.IndexField; import com.google.gson.JsonArray; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParseException; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Set; public class IndexDeserializer implements JsonDeserializer<List<Index>> { public List<Index> deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { final List<Index> indices = new ArrayList<Index>(); final JsonObject jsonObject = json.getAsJsonObject(); JsonArray indArray = jsonObject.get("indexes").getAsJsonArray(); for (int i = 0; i < indArray.size(); i++) { JsonObject ind = indArray.get(i).getAsJsonObject(); String ddoc = null; if (!ind.get("ddoc").isJsonNull()) { // ddoc is optional ddoc = ind.get("ddoc").getAsString(); } Index idx = new Index(ddoc, ind.get("name").getAsString(), ind.get("type").getAsString()); JsonArray fldArray = ind.get("def").getAsJsonObject().get("fields").getAsJsonArray(); for (int j = 0; j < fldArray.size(); j++) { Set<Map.Entry<String, JsonElement>> fld = fldArray.get(j).getAsJsonObject().entrySet(); for (Map.Entry<String, JsonElement> entry : fld) { idx.addIndexField(entry.getKey(), IndexField.SortOrder.valueOf(entry.getValue().getAsString())); } } //end fldArray indices.add(idx); } // end indexes return indices; } }