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/**
* 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));
}
}
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