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Development of JAMS Components

Installation of a Development Environment

You can download the development environment NetBeans at http://netbeans.org for free. The latest version is NetBeans IDE 6.9.1. Select Java SE, JavaFX, Java or All as NetBeans IDE Download package. In addition, the Java Development Kit (JDK) is required which can be downloaded at http://www.oracle.com/technetwork/java/javase/downloads/index.html.

Your NetBeans developer environment looks like this after starting it:

Bild:Bild1_1.png

Loading JAMS/J2000 sources from the Internet

The Java sources from JAMS/J2000 and various standard components, including all required libraries, can be downloaded at http://www.geoinf.uni-jena.de/5580.0.html using the link JAMS-2 16-src.tgz.

Bild:Quellen_1.png

The following source folders are included:

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Setting up Projects in NetBeans

The projects are to be integrated according to the following order:

Step 1 - Integrating the JAMS Project

The JAMS/J2000 sources have to be loaded into the Netbeans. First, the JAMS project is set up. In order to do so, open NetBeans and select New Project under the menu item File.

Bild:Neues_Projekt.png

The following window appears:

Bild:Projekt_laden1.png

Since you want to integrate an existing source code, select Java Project with Existing Source. Click on Next. In the second step, you have to enter a name and a project folder. A project folder is entered as a default but it can be modified. Click on Next.

Bild:Projekt_laden2_2.png

By clicking on the button Add Folder you should load the following sources into the project:

JAMSapi
JAMScommon
JAMSExplorer
JAMSMain
JAMSRemote
JAMSstarter
JAMSui

Bild:Projekt_laden3_1.png

Click on Finish.

In the next step, the required libraries for the project have to be loaded. You can find them in the downloaded source folder under JAMS-2_x-src\ext. (x stands for the version which is currently downloaded but changes over time) Right-click on the JAMS project in the generated JAMS project. Select item Properties.

Bild:Projekt_laden3_2.png

Select the item Libraries in the right part of the window Project Properties - JAMS under Categories. By using the button Add JAR/Folder the required libraries can be loaded. Load all libraries which are available in the downloaded source folder JAMS-2_x-src\ext.

Bild:Bibliotheken_laden.png

The JAMS project has been set up.

Bild:JAMS_Projekt.png

If you want to compile the project, right-click on the JAMS project and select the item Build and Clean. The JAMS.jar is being generated. In the bottom left window of your NetBeans developer environment you can check whether the process has been successful and where the JAMS.jar has been saved.

Bild:Build_Clean.png

Step 2 - Integrating the J2000 Project

Integrate the project J2000 as new project with existing sources as described in step 1. The sources are in directory ...\JAMS-x-src\J2K\src which has been downloaded.

Bild:J2000_Quellen.png

Load the generated JAMS.jar which has been generated in step 1 as a library.

Bild:Bibliotheken_laden_J2000.png

Compile the new project by right-clicking on the project J2000 and selecting the menu item Build and Clean. In the bottom right window of your NetBeans developer environment you should read BUILD SUCCESSFUL.

Step 3 - Integrating the JAMSComponents Project

Integrate the project JAMSComponents as new project with existing sources as described in step 1. The sources are in directory ...\JAMS-x-src\JAMSComponents\src which has been downloaded.

Load the JAMS.jar which has been generated in step 1 as library as well as all libraries (*.jar - files) from folder ...\JAMS-x-src\ext. Bild:Bibliotheken_laden_JAMSComponents.png

Compile the new project by right-clicking on the project J2000 and selecting the menu item Build and Clean. In the bottom right window of your NetBeans developer environment you should read BUILD SUCCESSFUL.

Launching Process Components from the NetBeans

Every process component which has a main procedure can be launched directly from the NetBeans. Jede Prozesskomponente welche über eine Main-Procedure vefügt, kann aus dem NetBeans direkt gestartet werden. As an example, we will launch the JAMSLauncher directly which is described in detail in the tutorial for basic users.

Main Classes

Right-click on the project JAMS. Choose the menu item Properties. Click on run in the left part of the window. Enter as Main Class the class which should be launched during project run. By single-clicking on the button Browse... all Main Classes which are available in the project are shown; these are all components which have a main procedure. Choose jamsui.launcher.JAMSui as an example. Click on Set Main Class. The following window should appear:

Bild:Main_classes.png

Click on OK. Launch the project JAMS by (left-)clicking on the project, the choosing the item run. The JAMSLauncher starts. In this way, various classes with a main procedure can be started.

Development of New Process Components in JAVA

Structure of a Component

Every JAMS process component is structured like this:

1. package name. It is automatically generated by NetBeans.

package org.unijena.j2k.interception;

2. Import of libraries/classes which are required for the process components.

import jams.data.*;
import jams.model.*;
...

3. Starting the process component. Every process component starts with a component description. In this way, new metadata of the component can be stored in the source code. It should include information on the component title, the author, version and modification date. In addition, a short description of the component is required.

@JAMSComponentDescription(
       title="...",
       author="...",
       description="...",
       version="...",
       date="..."    
       )

public class NewClass {

4. Set of variables with public and private variables. The public variables can be accessed from other classes within a model. For every public variable remarks in the form of Annotations are included in the source code.

The access type (AccessType) JAMSVarDescription.AccessType.READ (variables are only read), JAMSVarDescription.AccessType.WRITE (variablen are only written) or JAMSVarDescription.AccessType.READWRITE (variables are read and written) can be chosesn.

In addition, a short description as well as a measurement unit (if possible) and an upper and lower boundary of the variable is required.

@JAMSVarDescription(
           access =... ,
           description = "...",
           unit = "...",
           lowerBound= ...,
           upperBound =...            
           )
public JAMSDouble  var1;

@JAMSVarDescription(
           access =... ,
           description = "...",
           unit = "...",
           lowerBound= ...,
           upperBound =...            
           )
public JAMSInteger var2;
 
@JAMSVarDescription(
           access =... ,
           description = "...",
           unit = "...",
           lowerBound= ...,
           upperBound =...            
           )
public JAMSString  var3;
...

private JAMSDoublr var4;
...

Every JAMS- or J2000-class has the procedures init(), run() and cleanup() available.

5. The init procedure is passed during the initialization of the model.

public void init() throws JAMSEntity.NoSuchAttributeException{
...       
}

6. The run procedure is passed during the model run.

public void run() throws JAMSEntity.NoSuchAttributeException{
...
}

7. The cleanup procedure is passed at the end of a model run.

public void cleanup() throws JAMSEntity.NoSuchAttributeException{
...
}

8. Private procedures and functions. These are only available within the process component.

private double funktion1(double var){
       ...
       return ...;
   }

9. End of process component.

Example of a Complete Process Component

1. Package name

package org.unijena.j2k.potET;

2. Imported libraries

import java.io.*;
import jams.data.*;
import jams.model.*;