Java tutorial
/* Copyright 2013 Red Hat, Inc. and/or its affiliates. This file is part of lightblue. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ package com.redhat.lightblue.crud; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.node.ObjectNode; import com.redhat.lightblue.Request; import com.redhat.lightblue.query.Projection; import com.redhat.lightblue.query.QueryExpression; import com.redhat.lightblue.query.UpdateExpression; /** * Request to update documents based on a query */ public class UpdateRequest extends Request { private QueryExpression query; private UpdateExpression updateExpression; private Projection returnFields; /** * The fields to return from the updated documents */ public Projection getReturnFields() { return returnFields; } /** * The fields to return from the updated documents */ public void setReturnFields(Projection p) { returnFields = p; } /** * The expression specifying how to modify the documents */ public UpdateExpression getUpdateExpression() { return updateExpression; } /** * The expression specifying how to modify the documents */ public void setUpdateExpression(UpdateExpression x) { updateExpression = x; } /** * The query specifying which documents to be updated */ public QueryExpression getQuery() { return query; } /** * The query specifying which documents to be updated */ public void setQuery(QueryExpression q) { query = q; } /** * Returns a json representation of this */ @Override public JsonNode toJson() { ObjectNode node = (ObjectNode) super.toJson(); if (query != null) { node.set("query", query.toJson()); } if (updateExpression != null) { node.set("update", updateExpression.toJson()); } if (returnFields != null) { node.set("projection", returnFields.toJson()); } return node; } /** * Parses an update request from a Json object */ public static UpdateRequest fromJson(ObjectNode node) { UpdateRequest req = new UpdateRequest(); req.parse(node); JsonNode x = node.get("query"); if (x != null) { req.query = QueryExpression.fromJson(x); } x = node.get("update"); if (x != null) { req.updateExpression = UpdateExpression.fromJson(x); } x = node.get("projection"); if (x != null) { req.returnFields = Projection.fromJson(x); } return req; } }