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• MongoExecutionOptions.java

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com.redhat.lightblue.mongo.crud.MongoExecutionOptions Maven / Gradle / Ivy

/*
 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 .
 */
package com.redhat.lightblue.mongo.crud;

import com.mongodb.ReadPreference;
import com.mongodb.WriteConcern;
import com.redhat.lightblue.ExecutionOptions;
import com.redhat.lightblue.mongo.config.MongoReadPreference;

/**
 * This class deals with mongodb specific execution options
 */
public class MongoExecutionOptions {

    // see https://jewzaam.gitbooks.io/lightblue-specifications/content/language_specification/execution.html
    public static final String OPT_READ_PREFERENCE = "readPreference";
    public static final String OPT_WRITE_CONCERN = "writeConcern";

    public static final String OPT_READ_PREFERENCE_NEAREST = MongoReadPreference.READ_PREFERENCE_NEAREST;
    public static final String OPT_READ_PREFERENCE_PRIMARY = MongoReadPreference.READ_PREFERENCE_PRIMARY;
    public static final String OPT_READ_PREFERENCE_PRIMARY_PREFERRED = MongoReadPreference.READ_PREFERENCE_PRIMARY_PREFERRED;
    public static final String OPT_READ_PREFERENCE_SECONDARY = MongoReadPreference.READ_PREFERENCE_SECONDARY;
    public static final String OPT_READ_PREFERENCE_SECONDARY_PREFERRED = MongoReadPreference.READ_PREFERENCE_SECONDARY_PREFERRED;

    /**
     * Returns a read preference based on the execution options. If the
     * execution options don't specify a read preference, returns null
     *
     * The read preferences can be nearest, primary, primaryPreferred,
     * secondary, and secondaryPreferred, with optional tags. The tags are
     * specified as:
     * 
     *    readPreference ( tags1, tags2,... )
     * 
     * where each 'tags' is a JSON string containing name/value pairs:
     * 
     *    { name:value, name:value, ... }
     * 
     */
    public static ReadPreference getReadPreference(ExecutionOptions options) {
        if (options != null) {
            String value = options.getOptions().get(OPT_READ_PREFERENCE);
            if (value != null) {
                value = value.trim();
                if (value.length() > 0) {
                    return MongoReadPreference.parse(value);
                }
            }
        }
        return null;
    }

    public static WriteConcern getWriteConcern(ExecutionOptions options) {
        if (options != null) {
            String value = options.getOptions().get(OPT_WRITE_CONCERN);
            if (value != null) {
                value = value.trim();
                if (value.length() > 0) {
                    return WriteConcern.valueOf(value);
                }
            }
        }
        return null;
    }

}