Added the DataUnit class, allows to easily convert DataType (kb, mb, …

…gb, ects..).

common/src/main/java/fr/atlasworld/common/file/DataUnit.java

@@ -0,0 +1,37 @@
+package fr.atlasworld.common.file;
+
+public final class DataUnit {
+    public static final DataUnit BYTES = new DataUnit("Byte", "b", 1);
+    public static final DataUnit KB = new DataUnit("Kilobyte", "kb", BYTES.multiplier * 1024);
+    public static final DataUnit MB = new DataUnit("Megabyte", "mb", KB.multiplier * 1024);
+    public static final DataUnit GB = new DataUnit("Gigabyte", "gb", MB.multiplier * 1024);
+    public static final DataUnit TB = new DataUnit("Terabyte", "tb", GB.multiplier * 1024);
+    public static final DataUnit PB = new DataUnit("Petabyte", "pb", TB.multiplier * 1024);
+
+    private final String displayName;
+    private final String shortName;
+    private final long multiplier;
+
+    private DataUnit(String displayName, String shortName, long multiplier) {
+        this.displayName = displayName;
+        this.shortName = shortName;
+        this.multiplier = multiplier;
+    }
+
+    public String displayName() {
+        return displayName;
+    }
+
+    public String shortUnit() {
+        return shortName;
+    }
+
+    public long multiplier() {
+        return multiplier;
+    }
+
+    public long convert(long value, DataUnit sourceUnit) {
+        long byteSize = value / sourceUnit.multiplier;
+        return byteSize * this.multiplier;
+    }
+}

common/src/main/java/fr/atlasworld/common/file/reader/FileReader.java

@@ -5,6 +5,7 @@
 import com.google.common.hash.Hashing;
 import com.google.common.io.ByteSource;
 import com.google.common.io.Files;
+import fr.atlasworld.common.file.DataUnit;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -111,6 +112,16 @@ public String checksum(HashFunction func) throws IOException {
         return fileBytes.hash(func).toString();
     }
 
+    /**
+     * Retrieve the size of the file in the specified data unit.
+     *
+     * @param unit data unit in which the file size should be returned.
+     * @return file size in the specified {@link DataUnit}
+     */
+    public long size(DataUnit unit) {
+        return unit.convert(this.file.length(), DataUnit.BYTES);
+    }
+
     /**
      * Retrieve the file this reader is handling.
      *

common/src/main/java/module-info.java

@@ -13,6 +13,7 @@
     exports fr.atlasworld.common.compound;
     exports fr.atlasworld.common.compound.json;
     exports fr.atlasworld.common.exception;
+    exports fr.atlasworld.common.file;
     exports fr.atlasworld.common.file.reader;
     exports fr.atlasworld.common.logging;
     exports fr.atlasworld.common.logging.stream;