com.helger.charset.utf7.UTF7CharsetModified Maven / Gradle / Ivy
/**
* Copyright (C) 2014-2020 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.helger.charset.utf7;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.helger.commons.annotation.Nonempty;
/**
*
* The character set specified in RFC 3501 to use for IMAP4rev1 mailbox name
* encoding.
*
*
* @see RFC 3501
* @author Jaap Beetstra
*/
final class UTF7CharsetModified extends AbstractUTF7StyleCharset
{
private static final String MODIFIED_BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"abcdefghijklmnopqrstuvwxyz" +
"0123456789+,";
UTF7CharsetModified (@Nonnull @Nonempty final String sName, @Nullable final String [] aAliases)
{
super (sName, aAliases, MODIFIED_BASE64_ALPHABET, true);
}
@Override
protected boolean canEncodeDirectly (final char ch)
{
if (ch == shift ())
return false;
return ch >= 0x20 && ch <= 0x7E;
}
@Override
protected byte shift ()
{
return '&';
}
@Override
protected byte unshift ()
{
return '-';
}
}