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package org.apache.harmony.beans.internal.nls;


import java.util.MissingResourceException;
import java.util.ResourceBundle;

//import org.apache.harmony.kernel.vm.VM;

/**
 * This class retrieves strings from a resource bundle and returns them,
 * formatting them with MessageFormat when required.
 * 

* It is used by the system classes to provide national language support, by * looking up messages in the * org.apache.harmony.beans.internal.nls.messages * * resource bundle. Note that if this file is not available, or an invalid key * is looked up, or resource bundle support is not available, the key itself * will be returned as the associated message. This means that the KEY * should a reasonable human-readable (english) string. * */ public class Messages { // ResourceBundle holding the system messages. static private ResourceBundle bundle = null; /** * Retrieves a message which has no arguments. * * @param msg * String the key to look up. * @return String the message for that key in the system message bundle. */ static public String getString(String msg) { if (bundle == null) return msg; try { return bundle.getString(msg); } catch (MissingResourceException e) { return "Missing message: " + msg; //$NON-NLS-1$ } } /** * Retrieves a message which takes 1 argument. * * @param msg * String the key to look up. * @param arg * Object the object to insert in the formatted output. * @return String the message for that key in the system message bundle. */ static public String getString(String msg, Object arg) { return getString(msg, new Object[] { arg }); } /** * Retrieves a message which takes 1 integer argument. * * @param msg * String the key to look up. * @param arg * int the integer to insert in the formatted output. * @return String the message for that key in the system message bundle. */ static public String getString(String msg, int arg) { return getString(msg, new Object[] { Integer.toString(arg) }); } /** * Retrieves a message which takes 1 character argument. * * @param msg * String the key to look up. * @param arg * char the character to insert in the formatted output. * @return String the message for that key in the system message bundle. */ static public String getString(String msg, char arg) { return getString(msg, new Object[] { String.valueOf(arg) }); } /** * Retrieves a message which takes 2 arguments. * * @param msg * String the key to look up. * @param arg1 * Object an object to insert in the formatted output. * @param arg2 * Object another object to insert in the formatted output. * @return String the message for that key in the system message bundle. */ static public String getString(String msg, Object arg1, Object arg2) { return getString(msg, new Object[] { arg1, arg2 }); } /** * Retrieves a message which takes several arguments. * * @param msg * String the key to look up. * @param args * Object[] the objects to insert in the formatted output. * @return String the message for that key in the system message bundle. */ static public String getString(String msg, Object[] args) { String format = msg; if (bundle != null) { try { format = bundle.getString(msg); } catch (MissingResourceException e) { } } return format(format, args); } /** * Generates a formatted text string given a source string containing * "argument markers" of the form "{argNum}" where each argNum must be in * the range 0..9. The result is generated by inserting the toString of each * argument into the position indicated in the string. *

* To insert the "{" character into the output, use a single backslash * character to escape it (i.e. "\{"). The "}" character does not need to be * escaped. * * @param format * String the format to use when printing. * @param args * Object[] the arguments to use. * @return String the formatted message. */ public static String format(String format, Object[] args) { StringBuilder answer = new StringBuilder(format.length() + (args.length * 20)); String[] argStrings = new String[args.length]; for (int i = 0; i < args.length; ++i) { if (args[i] == null) argStrings[i] = ""; //$NON-NLS-1$ else argStrings[i] = args[i].toString(); } int lastI = 0; for (int i = format.indexOf('{', 0); i >= 0; i = format.indexOf('{', lastI)) { if (i != 0 && format.charAt(i - 1) == '\\') { // It's escaped, just print and loop. if (i != 1) answer.append(format.substring(lastI, i - 1)); answer.append('{'); lastI = i + 1; } else { // It's a format character. if (i > format.length() - 3) { // Bad format, just print and loop. answer.append(format.substring(lastI, format.length())); lastI = format.length(); } else { int argnum = (byte) Character.digit(format.charAt(i + 1), 10); if (argnum < 0 || format.charAt(i + 2) != '}') { // Bad format, just print and loop. answer.append(format.substring(lastI, i + 1)); lastI = i + 1; } else { // Got a good one! answer.append(format.substring(lastI, i)); if (argnum >= argStrings.length) answer.append(""); //$NON-NLS-1$ else answer.append(argStrings[argnum]); lastI = i + 3; } } } } if (lastI < format.length()) answer.append(format.substring(lastI, format.length())); return answer.toString(); } // // /** // * Changes the locale of the messages. // * // * @param locale // * Locale the locale to change to. // */ // static public ResourceBundle setLocale(final Locale locale, // final String resource) { // try { // final ClassLoader loader = VM.bootCallerClassLoader(); // return (ResourceBundle) AccessController // .doPrivileged(new PrivilegedAction() { // public Object run() { // return ResourceBundle.getBundle(resource, locale, // loader != null ? loader : ClassLoader.getSystemClassLoader()); // } // }); // } catch (MissingResourceException e) { // } // return null; // } // // static { // // Attempt to load the messages. // try { // bundle = setLocale(Locale.getDefault(), // "org.apache.harmony.beans.internal.nls.messages"); //$NON-NLS-1$ // } catch (Throwable e) { // e.printStackTrace(); // } // } }