http://www.eclipse.org/jgit//org.eclipse.jgit: Repository access and algorithms (Eclipse JGit Project)
  • Eclipse Distribution License (New BSD License)
  • Andrey Loskutov
  • Christian Halstrick
  • Dave Borowitz
  • David Pursehouse
  • Gunnar Wagenknecht
  • Jonathan Nieder
  • Jonathan Tan
  • Matthias Sohn
  • Sasa Zivkov
  • Terry Parker
  • Thomas Wolf 
/*
 * Copyright (C) 2010, Sasa Zivkov <sasa.zivkov@sap.com>
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.nls;

import java.lang.reflect.Field;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.jgit.errors.TranslationBundleLoadingException;
import org.eclipse.jgit.errors.TranslationStringMissingException;


Base class for all translation bundles that provides injection of translated
texts into public String fields.


The usage pattern is shown with the following example. First define a new
translation bundle:

public class TransportText extends TranslationBundle {
	public static TransportText get() {
		return NLS.getBundleFor(TransportText.class);
	}
	public String repositoryNotFound;
	public String transportError;
}


Second, define one or more resource bundle property files.

TransportText_en_US.properties:
		repositoryNotFound=repository {0} not found
		transportError=unknown error talking to {0}
TransportText_de.properties:
		repositoryNotFound=repository {0} nicht gefunden
		transportError=unbekannter Fehler während der Kommunikation mit {0}
...


Then make use of it:

NLS.setLocale(Locale.GERMAN); // or skip this call to stick to the JVM default locale
...
throw new TransportException(uri, TransportText.get().transportError);

 The translated text is automatically injected into the public String fields according to the locale set with NLS.setLocale(Locale). However, the NLS.setLocale(Locale) method defines only prefered locale which will be honored only if it is supported by the provided resource bundle property files. Basically, this class will use ResourceBundle.getBundle(String, Locale) method to load a resource bundle. See the documentation of this method for a detailed explanation of resource bundle loading strategy. After a bundle is created the effectiveLocale() method can be used to determine whether the bundle really corresponds to the requested locale or is a fallback. 
 To load a String from a resource bundle property file this class uses the ResourceBundle.getString(String). This method can throw the MissingResourceException and this class is not making any effort to catch and/or translate this exception. 

To define a concrete translation bundle one has to:

    

  • extend this class

  • define a public static get() method like in the example above

  • define public static String fields for each text message

  • make sure the translation bundle class provide public no arg constructor

  • provide one or more resource bundle property files in the same package
where the translation bundle class resides



/**
 * Base class for all translation bundles that provides injection of translated
 * texts into public String fields.
 *
 * <p>
 * The usage pattern is shown with the following example. First define a new
 * translation bundle:
 *
 * <pre>
 * public class TransportText extends TranslationBundle {
 * 	public static TransportText get() {
 * 		return NLS.getBundleFor(TransportText.class);
 * 	}
 *
 * 	public String repositoryNotFound;
 *
 * 	public String transportError;
 * }
 * </pre>
 *
 * Second, define one or more resource bundle property files.
 *
 * <pre>
 * TransportText_en_US.properties:
 * 		repositoryNotFound=repository {0} not found
 * 		transportError=unknown error talking to {0}
 * TransportText_de.properties:
 * 		repositoryNotFound=repository {0} nicht gefunden
 * 		transportError=unbekannter Fehler während der Kommunikation mit {0}
 * ...
 * </pre>
 *
 * Then make use of it:
 *
 * <pre>
 * NLS.setLocale(Locale.GERMAN); // or skip this call to stick to the JVM default locale
 * ...
 * throw new TransportException(uri, TransportText.get().transportError);
 * </pre>
 *
 * The translated text is automatically injected into the public String fields
 * according to the locale set with
 * {@link org.eclipse.jgit.nls.NLS#setLocale(Locale)}. However, the
 * {@link org.eclipse.jgit.nls.NLS#setLocale(Locale)} method defines only
 * prefered locale which will be honored only if it is supported by the provided
 * resource bundle property files. Basically, this class will use
 * {@link java.util.ResourceBundle#getBundle(String, Locale)} method to load a
 * resource bundle. See the documentation of this method for a detailed
 * explanation of resource bundle loading strategy. After a bundle is created
 * the {@link #effectiveLocale()} method can be used to determine whether the
 * bundle really corresponds to the requested locale or is a fallback.
 *
 * <p>
 * To load a String from a resource bundle property file this class uses the
 * {@link java.util.ResourceBundle#getString(String)}. This method can throw the
 * {@link java.util.MissingResourceException} and this class is not making any
 * effort to catch and/or translate this exception.
 *
 * <p>
 * To define a concrete translation bundle one has to:
 * <ul>
 * <li>extend this class
 * <li>define a public static get() method like in the example above
 * <li>define public static String fields for each text message
 * <li>make sure the translation bundle class provide public no arg constructor
 * <li>provide one or more resource bundle property files in the same package
 * where the translation bundle class resides
 * </ul>
 */
public abstract class TranslationBundle {

	private Locale effectiveLocale;
	private ResourceBundle resourceBundle;

	
Get the locale used for loading the resource bundle from which the field
values were taken.

Returns:the locale used for loading the resource bundle from which the
        field values were taken.
/**
	 * Get the locale used for loading the resource bundle from which the field
	 * values were taken.
	 *
	 * @return the locale used for loading the resource bundle from which the
	 *         field values were taken.
	 */
	public Locale effectiveLocale() {
		return effectiveLocale;
	}

	
Get the resource bundle on which this translation bundle is based.

Returns:the resource bundle on which this translation bundle is based.
/**
	 * Get the resource bundle on which this translation bundle is based.
	 *
	 * @return the resource bundle on which this translation bundle is based.
	 */
	public ResourceBundle resourceBundle() {
		return resourceBundle;
	}

	
Injects locale specific text in all instance fields of this instance.
Only public instance fields of type String are considered.


The name of this (sub)class plus the given locale parameter
define the resource bundle to be loaded. In other words the
this.getClass().getName() is used as the
baseName parameter in the ResourceBundle.getBundle(String, Locale) parameter to load the resource bundle. 


Params:
  • locale – 
           defines the locale to be used when loading the resource bundle
Throws:
/**
	 * Injects locale specific text in all instance fields of this instance.
	 * Only public instance fields of type <code>String</code> are considered.
	 * <p>
	 * The name of this (sub)class plus the given <code>locale</code> parameter
	 * define the resource bundle to be loaded. In other words the
	 * <code>this.getClass().getName()</code> is used as the
	 * <code>baseName</code> parameter in the
	 * {@link ResourceBundle#getBundle(String, Locale)} parameter to load the
	 * resource bundle.
	 * <p>
	 *
	 * @param locale
	 *            defines the locale to be used when loading the resource bundle
	 * @exception TranslationBundleLoadingException
	 *                see {@link TranslationBundleLoadingException}
	 * @exception TranslationStringMissingException
	 *                see {@link TranslationStringMissingException}
	 */
	void load(Locale locale)
			throws TranslationBundleLoadingException {
		Class bundleClass = getClass();
		try {
			resourceBundle = ResourceBundle.getBundle(bundleClass.getName(),
					locale, bundleClass.getClassLoader());
		} catch (MissingResourceException e) {
			throw new TranslationBundleLoadingException(bundleClass, locale, e);
		}
		this.effectiveLocale = resourceBundle.getLocale();

		for (Field field : bundleClass.getFields()) {
			if (field.getType().equals(String.class)) {
				try {
					String translatedText = resourceBundle.getString(field.getName());
					field.set(this, translatedText);
				} catch (MissingResourceException e) {
					throw new TranslationStringMissingException(bundleClass, locale, field.getName(), e);
				} catch (IllegalArgumentException | IllegalAccessException e) {
					throw new Error(e);
				}
			}
		}
	}
}