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6. One of the most important command-line options deals with the selection of the Java Virtual Machine (JVM) under which the Eclipse platform is executed. If you don t want to use the standard JVM (the one executed when invoking the java command), you can specify a different JVM by using the command-line option -vm. When the Eclipse loader is invoked it uses a three-stage strategy to determine the JVM under which the platform is executed. If a JVM is explicitly specified with the command-line option -vm, then this VM is used. Otherwise, the loader will look for a specific Java Runtime Environment (JRE) that was deployed with the Eclipse platform. Such a JRE must be located in the directory eclipsejre. If such a JRE does not exist (as in our case), then the location of the VM is derived from the PATH environment variable. By the way, this strategy affects only the JVM under which the platform is executed. Which JVM and which SDK are used for Java development is specified separately in the Eclipse workbench. The command-line option -vmargs can be used to specify parameters for the Java Virtual Machine. For example: eclipse.exe -vm C:java13binjavaw -vmargs -Xmx256M Here Eclipse is started with a specific JVM and sets the JVM heap to 256 MB. With very large projects this can help to prevent instabilities of the workbench. Another important command-line parameter is the parameter-data for specifying the location of the workspace. In this case, the Workspace Launcher dialog discussed previously is skipped. This parameter allows you to create different Eclipse desktop shortcuts for different workspaces. The First Application: Hello World Until now you haven t seen much of a Java development environment. Eclipse which is advertised as a platform for everything and nothing in particular shows, in fact, nothing in particular when invoked for the first time. You are now going to change this radically. Perspectives To see something particular in Eclipse, you first must open an Eclipse perspective. Perspectives consist of a combination of windows and tools best suited for specific tasks. Perspectives are added to the Eclipse workbench by various Eclipse plug-ins. This is, for example, the case with the user interface of the Java IDE, which is nothing more than a large plug-in for the Eclipse workbench. To start developing Java programs, you therefore must first open the Java perspective. To do so, click the Open Perspective icon, as shown in Figure 1.4. 5 Introduction to Eclipse
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Figure 1.3 5. It is a good idea to create a desktop shortcut for Eclipse. Under Windows simply pull the Eclipse icon onto the desktop by pressing the right mouse button. From the context menu select Create Shortcut Here. Now you can add additional command-line options to this shortcut, for example, the -vm option discussed below. To do so, right-click the shortcut and select Properties from the context menu. To learn which command-line options are available for Eclipse, check the Eclipse help system by choosing Help > Help Contents. Then select Workbench User Guide, expand the Tasks item, and choose Running Eclipse. Under Linux you can similarly create a desktop shortcut under KDE or Gnome and add the required command-line options. A further list of command line options is found at Help > Help Contents > Platform Plug-in Developer Guide > Reference > Other reference information > Runtime options. This section lists all command line parameters and the corresponding System Property keys. (For example, the key osgi.instance.data is equivalent to the command line parameter -data.) These keys can be used to configure Eclipse via the configuration file eclipse configurationconfig.ini. Modifying this file allows you starting Eclipse in different configurations without having to use command line parameters. 4 Chapter 1
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4. After a short while you should see the Welcome screen. Here you have the choice of various information sources such as help pages, tutorials, sample programs, and others: . In the Overview section you will find relevant chapters from the various user guides in the Eclipse help system. . In the Tutorials section you can learn how to create a simple Java program, a simple SWT application, and an Eclipse plug-in, and you will learn how to create and deploy an Eclipse feature. These tutorials come in form of Cheat Sheets that can be followed in a stepby- step fashion. . The Samples section contains ready-to-run example programs. These include samples for using the SWT and the Eclipse workbench. If you select such an example program, it will automatically be downloaded from www.eclipse.org (provided that you have established a connection to the Internet) and installed into the Eclipse workbench. Depending on your interests and requirements, it may be worthwhile to take a close look at the code of such an example program. . In the What s New section you will find a compilation of the new features contained in Eclipse 3 and also a migration guide for converting the Eclipse 2 application into Eclipse 3 (see also Appendix B). Furthermore, there is a link to the Eclipse Community page and a link to the Eclipse Update site, where you can update your Eclipse installation online. However, for the moment you continue the startup process by pressing the Workbench button. You should then see the Eclipse Welcome screen, as displayed in Figure 1.2. You can return at any time to this screen by invoking the function Help > Welcome. Figure 1.3 shows Eclipse running. 3 Introduction to Eclipse Figure 1.2
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To install Eclipse, follow these steps: 1. Unpack the Eclipse SDK into the target directory. For example, on Windows that could be the root directory C:. In effect, the Eclipse libraries will be contained in directory C:eclipse. Under Linux you could use the /opt/ directory so that the Eclipse files would be stored under /opt/eclipse/. 2. Immediately afterwards, unpack the Eclipse example files into the same root directory. By doing so, the example files are automatically placed into the just-created eclipse subdirectory. 3. That s all. Under Windows you can now invoke Eclipse by clicking the icon with the darkened sun (in the eclipse subdirectory). Under Linux you would issue the shell command /eclipse under the directory /opt/eclipse/. Eclipse then prompts you with the Workspace Launcher. Here you can select the location of the Eclipse workspace. This workspace will later contain all of your Eclipse projects. Usually the workspace folder is located in the Eclipse root directory eclipse. However, it makes more sense to install the workspace in a location separate from the Eclipse installation. This makes later upgrades to new Eclipse version easier (see also Appendix A). In addition, it becomes easier to back up the workspace. For example, you may want to specify …Own Fileseclipse-workspace under Windows and /root/eclipse-workspace under Linux. The Eclipse Workspace Launcher is shown in Figure 1.1. Note that later when running Eclipse you can easily switch to a different workspace by invoking the function File > Open workspace. 2 Chapter 1 Figure 1.1 Important: When backing up the Eclipse workspace you should always create complete backups never incremental backups. Eclipse treats the archive attribute of files in a somewhat unconventional way, which can lead to a corrupt workspace when restoring a workspace from an incremental backup. This is a known bug in Eclipse that has not been fixed with the release of Eclipse 3.0.0.
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Introduction to Eclipse In this chapter you install and configure Eclipse. I then use the classical HelloWorld example to show how to effectively create Java programs under Eclipse. I first discuss the most important workbench preferences and then introduce various utilities for code creation. Installing Eclipse Installing Eclipse is very easy. In most cases, the only thing to do is to unpack the downloaded ZIP file onto a disk drive with sufficient free space. What do you need to run Eclipse? The following list shows what is required: . A suitable platform. Eclipse 3.0 runs on a wide variety of platforms: Windows, Linux, Solaris, QNX, AIX, HP-UX, and Mac OS X. However, in this book I mostly refer to the Windows platform and occasionally give hints for the Linux platform. . Sufficient disk space. 300 MB should be enough. . Sufficient RAM. 256 MB should be fine. . Java SDK 1.4. If this SDK is not installed on your machine, you can download it from www.javasoft.com and install it by following the instructions given on this site. You should specify the bin subdirectory of the SDK in your PATH environment variable so that you can call the Java Virtual Machine (JVM) by issuing the command java from the command prompt. . Eclipse SDK 3.0 for your platform. . The Eclipse example files (eclipse-examples-3.0) for your platform. 1
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xxiv Contents Chapter 16: Conclusions and Outlook 537 Programming Style 537 Executable Prototypes 538 Automated Tests 538 Refinements 538 Embrace Change 540 Save Energy 541 Java 1.5 541 Summary 542 Appendix A: Useful Plug-ins for Eclipse 545 Appendix B: Migrating Projects to a New Eclipse Version 551 Projects 551 Plug-ins 552 Migration to Eclipse 3 552 Appendix C: Important Downloads 555 Project One: Duke Speaks 555 Project Two: Jukebox 555 Project Three: A Spell Checker as an Eclipse Plug-In 555 Book Web Site 556 Appendix D: Bibliography 557 Index 559
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xxiii Contents Chapter 14: The Rich Client Platform 501 Definition and Motivation 501 Plug-ins and the RCP 502 Creating an Application 503 The IPlatformRunnable Interface 503 The WorkbenchAdvisor Class 503 Testing a Rich Client Application 507 Deploying a Rich Client Application 507 Advanced Product Customization 508 The Global Welcome Screen 508 Summary 509 Chapter 15: Project 4: The Hex Game as a Rich Client Application 511 Overview 511 Setting Up the Project 512 The Manifest plugin.xml 512 Required Eclipse Plug-ins 514 Declaring the Application 514 Defining a Perspective 515 Defining a View 515 Product Customization 515 Linking the Welcome Screen 515 Adding Help 516 The Completed Manifest 516 The RcpApplication Class 517 The RcpWorkbenchAdvisor Class 518 The RcpPerspective Class 519 The IGame and IStatusListener Interfaces 520 The IStatusListener Interface 520 The IGame Interface 520 The HexView Class 521 The Game Engine 527 The Welcome Screen 531 Test 534 Deployment 534 Summary 535
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xxii Contents Running the Engine 457 Managing Engines 458 Creating Engines 459 Processing Bad Words 462 Operations 462 Analyzing Documents 463 Configuring the Spell Checker 463 Preferences 463 Domain Model 464 The GUI 466 Reading from the PreferenceStore 471 The Help System 473 The Help Table of Contents 473 Context-Sensitive Help 473 Active Help 474 Running the Help Action 476 A Plug-in for Java Properties 477 Setting Up the Project 477 The Manifest 478 Tokenizer Extension 478 Manifest 479 The Plugin Class 480 The Preferences 481 The Preference Page 482 The Java-Properties Tokenizer 483 The Help System 483 Internationalizing the Spell Checker 484 Text Constants in Java Code 484 Text Constants in Manifest Files 487 Creating a Language Fragment 487 Deploying the Spell Checker 490 Defining the Spell Checker Feature 490 Configuring Ant Scripts 492 Defining the Language Feature 495 Defining the Update Site 497 Installation 498 Summary 499
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xxi Contents Installing from an Update Site 399 Adding an Update Site 400 Installing Features 400 Updating Features 400 Managing the Configuration 400 Install Handlers 401 Internationalizing Products 401 Text Constants in Programs 402 Text Constants in Manifest Files 403 Help Texts and Cheat Sheets 404 Deploying National Language Resource Bundles 405 Patches 405 Summary 405 Chapter 13: Project Three: A Spell Checker as an Eclipse Plug-in 407 The Spell Checker Core Classes 408 The Engine 408 Overview 409 Setting Up the Project 410 The Plug-in Configuration 412 The Manifest plugin.xml 413 The Schema documentTokenizer.exsd 417 Imported Files 419 The Plugin Class 419 Dictionary URL 421 Initializing Preferences 422 The Manager 423 The Check Spelling Action 424 The SpellCheckingTarget Class 425 Factory Method 426 Selections 427 Document Management 428 Text Replacement 429 Disposal 430 The CheckSpellingActionDelegate Class 431 The Correction Window 439 The SpellCorrectionView Class 439 View Actions 449 Managing Images 450 Coordinating Core Classes with GUI Classes 452 The Manager 453 Selecting the Plug-in 454
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xx Contents The Preferences Class 319 Path Specifications 319 Monitoring Long-Running Processes 320 The Eclipse Workspace 320 Resources 320 Markers 324 Reacting to Resource Changes 325 Managing Long-Running Processes 326 Configuring Plug-ins 327 The Plug-in Development Perspective 327 The Plug-in Manifest 329 The Most Important SDK Extension Points 332 The Schema Editor 341 Components of the Eclipse User Interface 344 Forms 344 The Eclipse Workbench 350 The Architecture of the Eclipse Workbench 351 Event Processing in the Eclipse Workbench 352 Editors 355 Views 362 Actions 367 Dialogs 372 Workbench Wizards 374 Preferences and Property Pages 377 Defining Perspectives 377 The Help System 379 Cheat Sheets 383 Summary 385 Chapter 12: Developing Your Own Eclipse-Based Products 387 Embedded Ant 388 Configuration 388 Editing Ant Scripts 389 Plug-ins and Fragments 390 Features 391 Creating and Editing Features 391 Deployment 393 Deploying a Feature 393 Deploying Complete Products 394 Customizing Products 394 Populating the Workspace 396 Creating Update Sites 398
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