core/java/android/content/Formatter.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.content;

/**
 * Utility class to aid in formatting common values that are not covered
 * by the standard java.util.Formatter
 * @hide
 */
public final class Formatter {

    /**
     * Formats a content size to be in the form of bytes, kilobytes, 
     * megabytes, etc
     * 
     * @param context Context to use to load the localized units
     * @param number size value to be formated
     * @return formated string with the number
     */
    public static String formatFileSize(Context context, long number) {
        if (context == null) {
            return "";
        }

        float result = number;
        int suffix = com.android.internal.R.string.byteShort;
        if (result > 900) {
            suffix = com.android.internal.R.string.kilobyteShort;
            result = result / 1024;
        }
        if (result > 900) {
            suffix = com.android.internal.R.string.megabyteShort;
            result = result / 1024;
        }
        if (result > 900) {
            suffix = com.android.internal.R.string.gigabyteShort;
            result = result / 1024;
        }
        if (result > 900) {
            suffix = com.android.internal.R.string.terabyteShort;
            result = result / 1024;
        }
        if (result > 900) {
            suffix = com.android.internal.R.string.petabyteShort;
            result = result / 1024;
        }
        if (result < 100) {
            return String.format("%.2f%s", result, context.getText(suffix).toString());
        }
        return String.format("%.0f%s", result, context.getText(suffix).toString());
    }
}