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package org.subethamail.smtp.internal.util;
import java.io.UnsupportedEncodingException;
import java.util.Collection;
import java.util.Iterator;
import com.google.common.annotations.VisibleForTesting;
/**
* @author Jeff Schnitzer
*/
public final class TextUtils {
private TextUtils() {
// prevent instantiation
}
/**
* @return a delimited string containing the specified items
*/
public static String joinTogether(Collection<String> items, String delim) {
StringBuffer ret = new StringBuffer();
for (Iterator<String> it = items.iterator(); it.hasNext();) {
ret.append(it.next());
if (it.hasNext()) {
ret.append(delim);
}
}
return ret.toString();
}
/**
* @return the value of str.getBytes() without the idiotic checked exception
*/
public static byte[] getBytes(String str, String charset) {
try {
return str.getBytes(charset);
} catch (UnsupportedEncodingException ex) {
throw new IllegalArgumentException(charset, ex);
}
}
/** @return the string as US-ASCII bytes */
public static byte[] getAsciiBytes(String str) {
return getBytes(str, "US-ASCII");
}
/**
* Converts the specified byte array to a string using the specified
* encoding but without throwing a checked exception. This is useful if the
* specified encoding is required to be available by the JRE specification,
* so the exception would be guaranteed to be not thrown anyway.
*/
@VisibleForTesting
static String getString(byte[] bytes, String charset) {
try {
return new String(bytes, charset);
} catch (UnsupportedEncodingException e) {
throw new IllegalArgumentException(e);
}
}
/**
* Converts the specified bytes to String using UTF-8 encoding.
*/
public static String getStringUtf8(byte[] bytes) {
return getString(bytes, "UTF-8");
}
}
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