1 files changed, 76 insertions, 0 deletions
diff --git a/java/com/android/voicemail/impl/mail/utils/Utility.java b/java/com/android/voicemail/impl/mail/utils/Utility.java
new file mode 100644
index 000000000..4db1681fb
--- /dev/null
+++ b/java/com/android/voicemail/impl/mail/utils/Utility.java
@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) 2015 The Android Open Source Project
+ *
+ * <p>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
+ *
+ * <p>http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * <p>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 com.android.voicemail.impl.mail.utils;
+
+import java.io.ByteArrayInputStream;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+
+/** Simple utility methods used in email functions. */
+public class Utility {
+  public static final Charset ASCII = Charset.forName("US-ASCII");
+
+  public static final String[] EMPTY_STRINGS = new String[0];
+
+  /**
+   * Returns a concatenated string containing the output of every Object's toString() method, each
+   * separated by the given separator character.
+   */
+  public static String combine(Object[] parts, char separator) {
+    if (parts == null) {
+      return null;
+    }
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < parts.length; i++) {
+      sb.append(parts[i].toString());
+      if (i < parts.length - 1) {
+        sb.append(separator);
+      }
+    }
+    return sb.toString();
+  }
+
+  /** Converts a String to ASCII bytes */
+  public static byte[] toAscii(String s) {
+    return encode(ASCII, s);
+  }
+
+  /** Builds a String from ASCII bytes */
+  public static String fromAscii(byte[] b) {
+    return decode(ASCII, b);
+  }
+
+  private static byte[] encode(Charset charset, String s) {
+    if (s == null) {
+      return null;
+    }
+    final ByteBuffer buffer = charset.encode(CharBuffer.wrap(s));
+    final byte[] bytes = new byte[buffer.limit()];
+    buffer.get(bytes);
+    return bytes;
+  }
+
+  private static String decode(Charset charset, byte[] b) {
+    if (b == null) {
+      return null;
+    }
+    final CharBuffer cb = charset.decode(ByteBuffer.wrap(b));
+    return new String(cb.array(), 0, cb.length());
+  }
+
+  public static ByteArrayInputStream streamFromAsciiString(String ascii) {
+    return new ByteArrayInputStream(toAscii(ascii));
+  }
+}