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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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.android.email.mail.store.imap;
import com.android.emailcommon.Logging;
import com.android.mail.utils.LogUtils;
import java.util.ArrayList;
/**
* Utility methods for use with IMAP.
*/
public class ImapUtility {
/**
* Apply quoting rules per IMAP RFC,
* quoted = DQUOTE *QUOTED-CHAR DQUOTE
* QUOTED-CHAR = <any TEXT-CHAR except quoted-specials> / "\" quoted-specials
* quoted-specials = DQUOTE / "\"
*
* This is used primarily for IMAP login, but might be useful elsewhere.
*
* NOTE: Not very efficient - you may wish to preflight this, or perhaps it should check
* for trouble chars before calling the replace functions.
*
* @param s The string to be quoted.
* @return A copy of the string, having undergone quoting as described above
*/
public static String imapQuoted(String s) {
// First, quote any backslashes by replacing \ with \\
// regex Pattern: \\ (Java string const = \\\\)
// Substitute: \\\\ (Java string const = \\\\\\\\)
String result = s.replaceAll("\\\\", "\\\\\\\\");
// Then, quote any double-quotes by replacing " with \"
// regex Pattern: " (Java string const = \")
// Substitute: \\" (Java string const = \\\\\")
result = result.replaceAll("\"", "\\\\\"");
// return string with quotes around it
return "\"" + result + "\"";
}
/**
* Gets all of the values in a sequence set per RFC 3501. Any ranges are expanded into a
* list of individual numbers. If the set is invalid, an empty array is returned.
* <pre>
* sequence-number = nz-number / "*"
* sequence-range = sequence-number ":" sequence-number
* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
* </pre>
*/
public static String[] getImapSequenceValues(String set) {
ArrayList<String> list = new ArrayList<String>();
if (set != null) {
String[] setItems = set.split(",");
for (String item : setItems) {
if (item.indexOf(':') == -1) {
// simple item
try {
Integer.parseInt(item); // Don't need the value; just ensure it's valid
list.add(item);
} catch (NumberFormatException e) {
LogUtils.d(Logging.LOG_TAG, "Invalid UID value", e);
}
} else {
// range
for (String rangeItem : getImapRangeValues(item)) {
list.add(rangeItem);
}
}
}
}
String[] stringList = new String[list.size()];
return list.toArray(stringList);
}
/**
* Expand the given number range into a list of individual numbers. If the range is not valid,
* an empty array is returned.
* <pre>
* sequence-number = nz-number / "*"
* sequence-range = sequence-number ":" sequence-number
* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
* </pre>
*/
public static String[] getImapRangeValues(String range) {
ArrayList<String> list = new ArrayList<String>();
try {
if (range != null) {
int colonPos = range.indexOf(':');
if (colonPos > 0) {
int first = Integer.parseInt(range.substring(0, colonPos));
int second = Integer.parseInt(range.substring(colonPos + 1));
if (first < second) {
for (int i = first; i <= second; i++) {
list.add(Integer.toString(i));
}
} else {
for (int i = first; i >= second; i--) {
list.add(Integer.toString(i));
}
}
}
}
} catch (NumberFormatException e) {
LogUtils.d(Logging.LOG_TAG, "Invalid range value", e);
}
String[] stringList = new String[list.size()];
return list.toArray(stringList);
}
}
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