com.joyfulmongo.db.JFMongoCmdCreate.java Source code

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Here is the source code for com.joyfulmongo.db.JFMongoCmdCreate.java

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/*
 * Copyright 2014 Weifeng Bao
 *
 * 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.joyfulmongo.db;

import java.util.Date;
import java.util.List;

import org.apache.commons.lang.RandomStringUtils;
import org.json.JSONObject;

import com.joyfulmongo.db.javadriver.JFDBCollection;
import com.joyfulmongo.db.javadriver.JFDBCollectionFactory;

public class JFMongoCmdCreate extends JFMongoCmd {
    private String collectionName;
    private Date now;
    private String newObjectId;
    private JSONObject mInput;

    public JFMongoCmdCreate(JFMongoObject obj) {
        this.collectionName = obj.getCollectionName();
        this.mInput = obj.toJson();
    }

    public JFMongoCmdCreate(String colname, JSONObject json) {
        this.collectionName = colname;
        this.mInput = json;
    }

    protected JSONObject getPayload() {
        return this.mInput;
    }

    @Override
    protected void beforeExecute() {
        String objectId = mInput.optString(Constants.Props.objectId.toString());
        if (objectId != null && objectId.length() > 0) {
            throw new IllegalArgumentException("Insert object should have have ObjectId.");
        } else {
            newObjectId = generateObjectId();
            mInput.put(Constants.Props.objectId.toString(), newObjectId);
        }
    }

    @Override
    protected JFMongoCmdResult execute() {
        JFMongoCmdResult result = new JFMongoCmdResult();

        List<ContainerObject> childs = findChildObject(mInput);
        for (ContainerObject child : childs) {
            child.onCreate(collectionName, mInput);
            if (child instanceof OpCmd) {
                OpCmd cmd = (OpCmd) child;
                Object o = cmd.onCreateOutput();
                String key = cmd.getKey();
                result.put(key, o);
            }
        }

        now = Utils.getCurrentTime();
        mInput.put(Constants.Props.createdAt.toString(), now);
        mInput.put(Constants.Props.updatedAt.toString(), now);

        JFDBCollection collection = JFDBCollectionFactory.getInstance().getCollection(collectionName);
        collection.create(mInput);

        result.setCreatedAt(now);
        result.setObjectId(newObjectId);
        return result;
    }

    @Override
    protected JFMongoCmdResult afterExecute(JFMongoCmdResult execResult) {
        return execResult;
    }

    protected String generateObjectId() {
        String objectId = null;

        while (objectId == null) {
            objectId = RandomStringUtils.randomAlphanumeric(10);
            boolean unique = verifyObjectIdUnique(objectId);
            if (unique) {
                break;
            } else {
                objectId = null;
            }
        }

        return objectId;
    }

    protected boolean verifyObjectIdUnique(String objectId) {
        JFMongoCmdQuery query = new JFMongoCmdQuery.Builder(this.collectionName)
                .projection(Constants.Props.objectId.toString())
                .whereEquals(Constants.Props.objectId.toString(), objectId).build();

        List<JFMongoObject> results = query.find();
        return results.size() == 0;
    }
}