128 lines
4.7 KiB
Java
128 lines
4.7 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.mail.store.imap;
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import com.android.emailcommon.Logging;
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import android.util.Log;
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import java.util.ArrayList;
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/**
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* Utility methods for use with IMAP.
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*/
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public class ImapUtility {
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/**
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* Apply quoting rules per IMAP RFC,
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* quoted = DQUOTE *QUOTED-CHAR DQUOTE
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* QUOTED-CHAR = <any TEXT-CHAR except quoted-specials> / "\" quoted-specials
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* quoted-specials = DQUOTE / "\"
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*
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* This is used primarily for IMAP login, but might be useful elsewhere.
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*
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* NOTE: Not very efficient - you may wish to preflight this, or perhaps it should check
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* for trouble chars before calling the replace functions.
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*
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* @param s The string to be quoted.
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* @return A copy of the string, having undergone quoting as described above
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*/
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public static String imapQuoted(String s) {
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// First, quote any backslashes by replacing \ with \\
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// regex Pattern: \\ (Java string const = \\\\)
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// Substitute: \\\\ (Java string const = \\\\\\\\)
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String result = s.replaceAll("\\\\", "\\\\\\\\");
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// Then, quote any double-quotes by replacing " with \"
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// regex Pattern: " (Java string const = \")
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// Substitute: \\" (Java string const = \\\\\")
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result = result.replaceAll("\"", "\\\\\"");
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// return string with quotes around it
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return "\"" + result + "\"";
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}
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/**
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* Gets all of the values in a sequence set per RFC 3501. Any ranges are expanded into a
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* list of individual numbers. If the set is invalid, an empty array is returned.
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* <pre>
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* sequence-number = nz-number / "*"
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* sequence-range = sequence-number ":" sequence-number
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* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
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* </pre>
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*/
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public static String[] getImapSequenceValues(String set) {
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ArrayList<String> list = new ArrayList<String>();
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if (set != null) {
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String[] setItems = set.split(",");
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for (String item : setItems) {
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if (item.indexOf(':') == -1) {
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// simple item
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try {
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Integer.parseInt(item); // Don't need the value; just ensure it's valid
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list.add(item);
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} catch (NumberFormatException e) {
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Log.d(Logging.LOG_TAG, "Invalid UID value", e);
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}
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} else {
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// range
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for (String rangeItem : getImapRangeValues(item)) {
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list.add(rangeItem);
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}
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}
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}
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}
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String[] stringList = new String[list.size()];
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return list.toArray(stringList);
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}
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/**
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* Expand the given number range into a list of individual numbers. If the range is not valid,
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* an empty array is returned.
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* <pre>
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* sequence-number = nz-number / "*"
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* sequence-range = sequence-number ":" sequence-number
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* sequence-set = (sequence-number / sequence-range) *("," sequence-set)
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* </pre>
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*/
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public static String[] getImapRangeValues(String range) {
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ArrayList<String> list = new ArrayList<String>();
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try {
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if (range != null) {
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int colonPos = range.indexOf(':');
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if (colonPos > 0) {
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int first = Integer.parseInt(range.substring(0, colonPos));
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int second = Integer.parseInt(range.substring(colonPos + 1));
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if (first < second) {
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for (int i = first; i <= second; i++) {
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list.add(Integer.toString(i));
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}
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} else {
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for (int i = first; i >= second; i--) {
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list.add(Integer.toString(i));
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}
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}
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}
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}
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} catch (NumberFormatException e) {
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Log.d(Logging.LOG_TAG, "Invalid range value", e);
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}
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String[] stringList = new String[list.size()];
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return list.toArray(stringList);
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}
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}
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