edu.wpi.cs.wpisuitetng.modules.AbstractEntityManager.java Source code

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/*******************************************************************************
 * Copyright (c) 2012 -- WPI Suite
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    mpdelladonna
 *******************************************************************************/

package edu.wpi.cs.wpisuitetng.modules;

import com.google.gson.JsonParseException;

import edu.wpi.cs.wpisuitetng.database.Data;

public abstract class AbstractEntityManager implements EntityManager<Model> {
    Data data;

    public AbstractEntityManager(Data data) {
        this.data = data;
    }

    /**
     * This static utility method takes a JSON string and attempts to
     *    retrieve a username field from it.
     * @param serializedUser   a JSON string containing a password
     * @return   the username field parsed.
     */
    public static String parseFieldFromJSON(String serializedModel, String FieldName) {
        if (!serializedModel.contains(FieldName)) {
            throw new JsonParseException("The given JSON string did not contain specified field.");
        }

        int fieldStartIndex = serializedModel.indexOf(FieldName);
        int separator = serializedModel.indexOf(':', fieldStartIndex);
        int startIndex = serializedModel.indexOf('"', separator) + 1;
        int endIndex = serializedModel.indexOf('"', startIndex);

        String field = serializedModel.substring(startIndex, endIndex);

        return field;
    }
}