Deal with null values

[lgpl/argeo-commons.git] / basic / runtime / org.argeo.basic.nodeps / src / main / java / org / argeo / StreamUtils.java

diff --git a/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/StreamUtils.java b/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/StreamUtils.java
index 10af68fa42f0862e72f477c18035b9af37eb55d2..c94950d194cd97bb6a5f2bb865890cd4a2c63fa6 100644 (file)
--- a/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/StreamUtils.java
+++ b/basic/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/StreamUtils.java
@@ -3,19 +3,44 @@ package org.argeo;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.Reader;
+import java.io.Writer;
 
 /** Utilities to be used when APache COmmons IO is not available. */
 public class StreamUtils {
+       private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
 
-       public static void copy(InputStream in, OutputStream out)
+       /*
+        * APACHE COMMONS IO (inspired)
+        */
+
+       /** @return the number of bytes */
+       public static Long copy(InputStream in, OutputStream out)
                        throws IOException {
-               byte[] buf = new byte[8192];
+               Long count = 0l;
+               byte[] buf = new byte[DEFAULT_BUFFER_SIZE];
+               while (true) {
+                       int length = in.read(buf);
+                       if (length < 0)
+                               break;
+                       out.write(buf, 0, length);
+                       count = count + length;
+               }
+               return count;
+       }
+
+       /** @return the number of chars */
+       public static Long copy(Reader in, Writer out) throws IOException {
+               Long count = 0l;
+               char[] buf = new char[DEFAULT_BUFFER_SIZE];
                while (true) {
                        int length = in.read(buf);
                        if (length < 0)
                                break;
                        out.write(buf, 0, length);
+                       count = count + length;
                }
+               return count;
        }
 
        public static void closeQuietly(InputStream in) {
@@ -36,8 +61,108 @@ public class StreamUtils {
                        }
        }
 
-       private StreamUtils() {
+       public static void closeQuietly(Reader in) {
+               if (in != null)
+                       try {
+                               in.close();
+                       } catch (Exception e) {
+                               //
+                       }
+       }
 
+       public static void closeQuietly(Writer out) {
+               if (out != null)
+                       try {
+                               out.close();
+                       } catch (Exception e) {
+                               //
+                       }
+       }
+
+       /*
+        * APACHE COMMONS CODEC (forked)
+        */
+       /**
+        * Used to build output as Hex
+        */
+       private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5',
+                       '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+
+       /**
+        * Used to build output as Hex
+        */
+       private static final char[] DIGITS_UPPER = { '0', '1', '2', '3', '4', '5',
+                       '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
+
+       /**
+        * Converts an array of bytes into a String representing the hexadecimal
+        * values of each byte in order. The returned String will be double the
+        * length of the passed array, as it takes two characters to represent any
+        * given byte.
+        * 
+        * @param data
+        *            a byte[] to convert to Hex characters
+        * @return A String containing hexadecimal characters
+        * @since 1.4
+        */
+       public static String encodeHexString(byte[] data) {
+               return new String(encodeHex(data));
+       }
+
+       /**
+        * Converts an array of bytes into an array of characters representing the
+        * hexadecimal values of each byte in order. The returned array will be
+        * double the length of the passed array, as it takes two characters to
+        * represent any given byte.
+        * 
+        * @param data
+        *            a byte[] to convert to Hex characters
+        * @return A char[] containing hexadecimal characters
+        */
+       public static char[] encodeHex(byte[] data) {
+               return encodeHex(data, true);
+       }
+
+       /**
+        * Converts an array of bytes into an array of characters representing the
+        * hexadecimal values of each byte in order. The returned array will be
+        * double the length of the passed array, as it takes two characters to
+        * represent any given byte.
+        * 
+        * @param data
+        *            a byte[] to convert to Hex characters
+        * @param toLowerCase
+        *            <code>true</code> converts to lowercase, <code>false</code> to
+        *            uppercase
+        * @return A char[] containing hexadecimal characters
+        * @since 1.4
+        */
+       public static char[] encodeHex(byte[] data, boolean toLowerCase) {
+               return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
+       }
+
+       /**
+        * Converts an array of bytes into an array of characters representing the
+        * hexadecimal values of each byte in order. The returned array will be
+        * double the length of the passed array, as it takes two characters to
+        * represent any given byte.
+        * 
+        * @param data
+        *            a byte[] to convert to Hex characters
+        * @param toDigits
+        *            the output alphabet
+        * @return A char[] containing hexadecimal characters
+        * @since 1.4
+        */
+       protected static char[] encodeHex(byte[] data, char[] toDigits) {
+               int l = data.length;
+               char[] out = new char[l << 1];
+               // two characters form the hex value.
+               for (int i = 0, j = 0; i < l; i++) {
+                       out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
+                       out[j++] = toDigits[0x0F & data[i]];
+               }
+               return out;
        }
 
 }