com.digitalgeneralists.assurance.model.ModelUtils.java Source code

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Here is the source code for com.digitalgeneralists.assurance.model.ModelUtils.java

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/*
 * Assurance
 * 
 * Created by Mark Johnson
 * 
 * Copyright (c) 2015 Digital Generalists, LLC.
 * 
 */
/*
 * Copyright 2015 Digital Generalists, LLC.
 *
 * 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.digitalgeneralists.assurance.model;

import java.io.File;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;

import org.apache.log4j.Logger;
import org.hibernate.Hibernate;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.digitalgeneralists.assurance.model.compare.file.IFileComparor;

public class ModelUtils {
    public static IInitializableEntity initializeEntity(IInitializableEntity entity, String propertyKey) {

        IInitializableEntity result = null;

        if (entity != null) {
            if (!Hibernate.isInitialized(entity.getPropertyToInitialize(propertyKey))) {
                // Because we are operating in a Swing application, the session context
                // closes after the initial bootstrap run. There appears to be an
                // "application"-level session configuration that should enable the
                // behavior we want for a desktop application, but there is no documentation
                // for it that I can find. 
                // So, Assurance mimics a web app request/response
                // cycle for calls into the model delegate through the Swing
                // application. All calls to the model initiated directly from the UI
                // essentially operate as a new "request" and rebuild the Hibernate and
                // Spring session contexts for use within that operation.
                ClassPathXmlApplicationContext springContext = null;
                try {
                    springContext = new ClassPathXmlApplicationContext("/META-INF/spring/app-context.xml");
                    IModelDelegate modelDelegate = (IModelDelegate) springContext.getBean("ModelDelegate");

                    result = modelDelegate.initializeEntity(entity, propertyKey);

                    modelDelegate = null;
                } finally {
                    if (springContext != null) {
                        springContext.close();
                    }
                    springContext = null;
                }
            } else {
                result = entity;
            }
        }

        return result;
    }

    public static String calculateHashForFile(File file) {
        Logger logger = Logger.getLogger(ModelUtils.class);

        String result = null;

        if (file != null) {
            // Because we are operating in a Swing application, the session context
            // closes after the initial bootstrap run. There appears to be an
            // "application"-level session configuration that should enable the
            // behavior we want for a desktop application, but there is no documentation
            // for it that I can find. 
            // So, Assurance mimics a web app request/response
            // cycle for calls into the model delegate through the Swing
            // application. All calls to the model initiated directly from the UI
            // essentially operate as a new "request" and rebuild the Hibernate and
            // Spring session contexts for use within that operation.
            ClassPathXmlApplicationContext springContext = null;
            try {
                springContext = new ClassPathXmlApplicationContext("/META-INF/spring/app-context.xml");
                IFileComparor comparor = (IFileComparor) springContext.getBean("FileCompareValidator");

                byte[] hash = comparor.calculateHashForFile(file);
                if (hash != null) {
                    result = hash.toString();
                } else {
                    result = "";
                }
                if (result.length() > 512) {
                    result = result.substring(0, 511);
                }

                comparor = null;
            } catch (NoSuchAlgorithmException e) {
                result = "";
                logger.warn(e);
            } catch (IOException e) {
                result = "";
                logger.warn(e);
            } finally {
                if (springContext != null) {
                    springContext.close();
                }
                springContext = null;
            }
        }

        return result;
    }
}