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package org.graalvm.visualvm.lib.ui;

import java.text.Format;
import java.text.MessageFormat;
import java.text.NumberFormat;
import java.util.ResourceBundle;

/**
 *
 * @author Jiri Sedlacek
 */
public final class Formatters {
    
    private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.graalvm.visualvm.lib.ui.Bundle"); // NOI18N
    
    private static NumberFormat NUMBER_FORMAT;
    /**
     * Returns Format instance for formatting numbers according to current Locale.
     * 
     * @return Format instance for formatting numbers according to current Locale
     */
    public static Format numberFormat() {
        if (NUMBER_FORMAT == null) {
            NUMBER_FORMAT = NumberFormat.getNumberInstance();
            NUMBER_FORMAT.setGroupingUsed(true);
        }
        return NUMBER_FORMAT;
    }
    
    private static NumberFormat PERCENT_FORMAT;
    /**
     * Returns Format instance for formatting percents according to current Locale.
     * 
     * @return Format instance for formatting percents according to current Locale
     */
    public static Format percentFormat() {
        if (PERCENT_FORMAT == null) {
            PERCENT_FORMAT = NumberFormat.getPercentInstance();
            PERCENT_FORMAT.setMaximumFractionDigits(1);
            PERCENT_FORMAT.setMinimumFractionDigits(0);
        }
        return PERCENT_FORMAT;
    }
    
    private static Format MILLISECONDS_FORMAT;
    /**
     * Returns Format instance to post-process a formatted milliseconds value.
     * By default adds a " ms" suffix to a formatted long value.
     * 
     * @return Format instance to post-process a formatted milliseconds value
     */
    public static Format millisecondsFormat() {
        if (MILLISECONDS_FORMAT == null) {
            MILLISECONDS_FORMAT = new MessageFormat(BUNDLE.getString("Formatters.MillisecondsFormat")); // NOI18N
        }
        return MILLISECONDS_FORMAT;
    }
    
    private static Format BYTES_FORMAT;
    /**
     * Returns Format instance to post-process a formatted Bytes (B) value.
     * By default adds a " B" suffix to a formatted long value.
     * 
     * @return Format instance to post-process a formatted Bytes value
     */
    public static Format bytesFormat() {
        if (BYTES_FORMAT == null) {
            BYTES_FORMAT = new MessageFormat(BUNDLE.getString("Formatters.BytesFormat")); // NOI18N
        }
        return BYTES_FORMAT;
    }
    
}
