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/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.internal;


import java.io.*;
import java.text.*;
import java.util.*;

import org.eclipse.swt.*;

/**
 * This class is a placeholder for utility methods commonly
 * used on J2SE platforms but not supported on some J2ME
 * profiles.
 * 

* It is part of our effort to provide support for both J2SE * and J2ME platforms. *

*

* IMPORTANT: some of the methods have been modified from their * J2SE parents. Refer to the description of each method for * specific changes. *

*
    *
  • Exceptions thrown may differ since J2ME's set of * exceptions is a subset of J2SE's one. *
  • *
  • The range of the mathematic functions is subject to * change. *
  • *
*/ public final class Compatibility { /** * Answers the most negative (i.e. closest to negative infinity) * integer value which is greater than or equal to the number obtained by dividing * the first argument p by the second argument q. * * @param p numerator * @param q denominator (must be different from zero) * @return the ceiling of the rational number p / q. */ public static int ceil(int p, int q) { return (int)Math.ceil((float)p / q); } /** * Answers whether the indicated file exists or not. * * @param parent the file's parent directory * @param child the file's name * @return true if the file exists */ public static boolean fileExists(String parent, String child) { return new File (parent, child).exists(); } /** * Answers the result of rounding to the closest integer the number obtained * by dividing the first argument p by the second argument q. *

* IMPORTANT: the j2me version has an additional restriction on * the arguments. p must be within the range 0 - 32767 (inclusive). * q must be within the range 1 - 32767 (inclusive). *

* * @param p numerator * @param q denominator (must be different from zero) * @return the closest integer to the rational number p / q */ public static int round(int p, int q) { return Math.round((float)p / q); } /** * Returns 2 raised to the power of the argument. * * @param n an int value between 0 and 30 (inclusive) * @return 2 raised to the power of the argument * * @exception IllegalArgumentException
    *
  • ERROR_INVALID_RANGE - if the argument is not between 0 and 30 (inclusive)
  • *
*/ public static int pow2(int n) { if (n >= 1 && n <= 30) return 2 << (n - 1); else if (n != 0) { SWT.error(SWT.ERROR_INVALID_RANGE); } return 1; } /** * Execute prog[0] in a separate platform process if the * underlying platform supports this. *

* The new process inherits the environment of the caller. *

* * @param prog array containing the program to execute and its arguments * @param envp * array of strings, each element of which has environment * variable settings in the format name=value * @param workingDir * the working directory of the new process, or null if the new * process should inherit the working directory of the caller * * @exception IOException * if the program cannot be executed * @exception SecurityException * if the current SecurityManager disallows program execution * * @since 3.6 */ public static void exec(String[] prog, String[] envp, String workingDir) throws java.io.IOException{ Runtime.getRuntime().exec(prog, null, workingDir != null ? new File(workingDir) : null); } private static ResourceBundle msgs = null; /** * Returns the NLS'ed message for the given argument. This is only being * called from SWT. * * @param key the key to look up * @return the message for the given key * * @see SWT#getMessage(String) */ public static String getMessage(String key) { String answer = key; if (key == null) { SWT.error (SWT.ERROR_NULL_ARGUMENT); } if (msgs == null) { try { msgs = ResourceBundle.getBundle("org.eclipse.swt.internal.SWTMessages"); //$NON-NLS-1$ } catch (MissingResourceException ex) { answer = key + " (no resource bundle)"; //$NON-NLS-1$ } } if (msgs != null) { try { answer = msgs.getString(key); } catch (MissingResourceException ex2) {} } return answer; } public static String getMessage(String key, Object[] args) { String answer = key; if (key == null || args == null) { SWT.error (SWT.ERROR_NULL_ARGUMENT); } if (msgs == null) { try { msgs = ResourceBundle.getBundle("org.eclipse.swt.internal.SWTMessages"); //$NON-NLS-1$ } catch (MissingResourceException ex) { answer = key + " (no resource bundle)"; //$NON-NLS-1$ } } if (msgs != null) { try { MessageFormat formatter = new MessageFormat(""); formatter.applyPattern(msgs.getString(key)); answer = formatter.format(args); } catch (MissingResourceException ex2) {} } return answer; } }





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