cloud.google.datastore.entity.commit.Commit.java Source code

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Here is the source code for cloud.google.datastore.entity.commit.Commit.java

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/**
 * Copyright (C) 2014 xuanhung2401.
 *
 * 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 cloud.google.datastore.entity.commit;

import java.util.ArrayList;
import java.util.List;

import cloud.google.datastore.GCDConfig;
import cloud.google.datastore.GCDStatic;
import cloud.google.datastore.entity.DataAction;
import cloud.google.datastore.entity.core.Entity;
import cloud.google.datastore.entity.core.Key;
import cloud.google.oauth2.AuthenticationFactory;
import cloud.google.util.ConnectionService;
import cloud.google.util.Utility;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

/**
 * @author xuanhung2401
 * 
 */
public class Commit<T> extends DataAction<T> {

    private boolean success = false;

    private List<T> entities = null;

    private CommitRequestBody commitRequestBody;

    public Commit(GCDConfig config, Class<T> clazz) {
        DataAction.config = config;
        this.type = clazz;
    }

    public Commit<T> entities(List<T> listObj) {
        this.entities = listObj;
        return this;
    }

    @SuppressWarnings("unchecked")
    public Commit<T> entities(T... objs) {
        this.entities = new ArrayList<T>();
        for (T t : objs) {
            this.entities.add(t);
        }
        return this;
    }

    public List<Key<T>> insert() {
        List<Key<T>> listKey = new ArrayList<Key<T>>();
        if (this.entities != null) {
            List<List<T>> splittedList = Utility.splitList(this.entities, 5);
            for (List<T> list : splittedList) {
                InsertMutation<T> inserter = new InsertMutation<T>(list, config.getProjectName());
                this.commitRequestBody = new CommitRequestBody(inserter, getTransaction());
                execute();
                if (success) {
                    for (Entity<T> entity : inserter.getInsert()) {
                        listKey.add(entity.getKey());
                    }
                }
            }
        }
        return listKey;
    }

    public List<Key<T>> update() {
        List<Key<T>> listKey = new ArrayList<Key<T>>();
        if (this.entities != null) {
            List<List<T>> splittedList = Utility.splitList(this.entities, 5);
            for (List<T> list : splittedList) {
                UpdateMutation<T> updater = new UpdateMutation<T>(list, config.getProjectName());
                this.commitRequestBody = new CommitRequestBody(updater, getTransaction());
                execute();
                if (success) {
                    for (Entity<T> entity : updater.getUpdate()) {
                        listKey.add(entity.getKey());
                    }
                }
            }
        }
        return listKey;
    }

    public boolean delete() {
        if (this.entities != null) {
            List<List<T>> splittedList = Utility.splitList(this.entities, 5);
            for (List<T> list : splittedList) {
                this.commitRequestBody = new CommitRequestBody(new DeleteMutation<T>(list, config.getProjectName()),
                        getTransaction());
                execute();
            }
        }
        return success;
    }

    private String getTransaction() {
        String result = ConnectionService
                .connect(GCDStatic.getDatastoreApiUrl() + config.getProjectName() + "/beginTransaction").body("")
                .accessToken(AuthenticationFactory.getInstance(config).getAccessToken()).post();
        JsonElement jelement = new JsonParser().parse(result);
        JsonObject jobject = jelement.getAsJsonObject();
        jelement = jobject.get("transaction");
        return jelement != null ? jelement.getAsString() : "";
    }

    private void execute() {
        String result = ConnectionService
                .connect(GCDStatic.getDatastoreApiUrl() + config.getProjectName() + "/commit")
                .body(this.commitRequestBody.getBody())
                .accessToken(AuthenticationFactory.getInstance(config).getAccessToken()).post();
        if (result == null) {
            success = false;
        } else {
            success = true;
        }
    }

}