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k-9/k9mail/src/main/java/com/fsck/k9/helper/Utility.java

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Java
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package com.fsck.k9.helper;
import android.content.Context;
import android.database.Cursor;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Handler;
import android.os.Looper;
import android.text.Editable;
import android.text.TextUtils;
import android.util.Log;
import android.widget.EditText;
import android.widget.TextView;
import com.fsck.k9.K9;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Utility {
// \u00A0 (non-breaking space) happens to be used by French MUA
// Note: no longer using the ^ beginning character combined with (...)+
// repetition matching as we might want to strip ML tags. Ex:
// Re: [foo] Re: RE : [foo] blah blah blah
private static final Pattern RESPONSE_PATTERN = Pattern.compile(
"((Re|Fw|Fwd|Aw|R\\u00E9f\\.)(\\[\\d+\\])?[\\u00A0 ]?: *)+", Pattern.CASE_INSENSITIVE);
/**
* Mailing-list tag pattern to match strings like "[foobar] "
*/
private static final Pattern TAG_PATTERN = Pattern.compile("\\[[-_a-z0-9]+\\] ",
Pattern.CASE_INSENSITIVE);
private static Handler sMainThreadHandler;
public static boolean arrayContains(Object[] a, Object o) {
for (Object element : a) {
if (element.equals(o)) {
return true;
}
}
return false;
}
public static boolean arrayContainsAny(Object[] a, Object... o) {
for (Object element : a) {
if (arrayContains(o, element)) {
return true;
}
}
return false;
}
/**
* Combines the given array of Objects into a single String using
* each Object's toString() method and the separator character
* between each part.
*
* @param parts
* @param separator
* @return new String
*/
public static String combine(Object[] parts, char separator) {
if (parts == null) {
return null;
}
return TextUtils.join(String.valueOf(separator), parts);
}
/**
* Combines the given Objects into a single String using
* each Object's toString() method and the separator character
* between each part.
*
* @param parts
* @param separator
* @return new String
*/
public static String combine(Iterable<?> parts, char separator) {
if (parts == null) {
return null;
}
return TextUtils.join(String.valueOf(separator), parts);
}
public static boolean requiredFieldValid(TextView view) {
return view.getText() != null && view.getText().length() > 0;
}
public static boolean requiredFieldValid(Editable s) {
return s != null && s.length() > 0;
}
public static boolean domainFieldValid(EditText view) {
if (view.getText() != null) {
String s = view.getText().toString();
if (s.matches("^([a-zA-Z0-9]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?\\.)*[a-zA-Z0-9]([a-zA-Z0-9\\-]{0,61}[a-zA-Z0-9])?$") &&
s.length() <= 253) {
return true;
}
if (s.matches("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$")) {
return true;
}
}
return false;
}
/**
* A fast version of URLDecoder.decode() that works only with UTF-8 and does only two
* allocations. This version is around 3x as fast as the standard one and I'm using it
* hundreds of times in places that slow down the UI, so it helps.
*/
public static String fastUrlDecode(String s) {
byte[] bytes = s.getBytes(Charset.forName("UTF-8"));
byte ch;
int length = 0;
for (int i = 0, count = bytes.length; i < count; i++) {
ch = bytes[i];
if (ch == '%') {
int h = (bytes[i + 1] - '0');
int l = (bytes[i + 2] - '0');
if (h > 9) {
h -= 7;
}
if (l > 9) {
l -= 7;
}
bytes[length] = (byte)((h << 4) | l);
i += 2;
} else if (ch == '+') {
bytes[length] = ' ';
} else {
bytes[length] = bytes[i];
}
length++;
}
return new String(bytes, 0, length, Charset.forName("UTF-8"));
}
/*
* TODO disabled this method globally. It is used in all the settings screens but I just
* noticed that an unrelated icon was dimmed. Android must share drawables internally.
*/
public static void setCompoundDrawablesAlpha(TextView view, int alpha) {
// Drawable[] drawables = view.getCompoundDrawables();
// for (Drawable drawable : drawables) {
// if (drawable != null) {
// drawable.setAlpha(alpha);
// }
// }
}
/**
* <p>Wraps a multiline string of text, identifying words by <code>' '</code>.</p>
*
* <p>New lines will be separated by the system property line separator.
* Very long words, such as URLs will <i>not</i> be wrapped.</p>
*
* <p>Leading spaces on a new line are stripped.
* Trailing spaces are not stripped.</p>
*
* <pre>
* WordUtils.wrap(null, *) = null
* WordUtils.wrap("", *) = ""
* </pre>
*
* Adapted from the Apache Commons Lang library.
* http://svn.apache.org/viewvc/commons/proper/lang
* /trunk/src/main/java/org/apache/commons/lang3/text/WordUtils.java
* SVN Revision 925967, Mon Mar 22 06:16:49 2010 UTC
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*
* @param str the String to be word wrapped, may be null
* @param wrapLength the column to wrap the words at, less than 1 is treated as 1
* @return a line with newlines inserted, <code>null</code> if null input
*/
private static final String NEWLINE_REGEX = "(?:\\r?\\n)";
public static String wrap(String str, int wrapLength) {
StringBuilder result = new StringBuilder();
for (String piece : str.split(NEWLINE_REGEX)) {
result.append(wrap(piece, wrapLength, null, false));
result.append("\r\n");
}
return result.toString();
}
/**
* <p>Wraps a single line of text, identifying words by <code>' '</code>.</p>
*
* <p>Leading spaces on a new line are stripped.
* Trailing spaces are not stripped.</p>
*
* <pre>
* WordUtils.wrap(null, *, *, *) = null
* WordUtils.wrap("", *, *, *) = ""
* </pre>
*
* This is from the Apache Commons Lang library.
* http://svn.apache.org/viewvc/commons/proper/lang
* /trunk/src/main/java/org/apache/commons/lang3/text/WordUtils.java
* SVN Revision 925967, Mon Mar 22 06:16:49 2010 UTC
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*
* @param str the String to be word wrapped, may be null
* @param wrapLength the column to wrap the words at, less than 1 is treated as 1
* @param newLineStr the string to insert for a new line,
* <code>null</code> uses the system property line separator
* @param wrapLongWords true if long words (such as URLs) should be wrapped
* @return a line with newlines inserted, <code>null</code> if null input
*/
public static String wrap(String str, int wrapLength, String newLineStr, boolean wrapLongWords) {
if (str == null) {
return null;
}
if (newLineStr == null) {
newLineStr = "\r\n";
}
if (wrapLength < 1) {
wrapLength = 1;
}
int inputLineLength = str.length();
int offset = 0;
StringBuilder wrappedLine = new StringBuilder(inputLineLength + 32);
while ((inputLineLength - offset) > wrapLength) {
if (str.charAt(offset) == ' ') {
offset++;
continue;
}
int spaceToWrapAt = str.lastIndexOf(' ', wrapLength + offset);
if (spaceToWrapAt >= offset) {
// normal case
wrappedLine.append(str.substring(offset, spaceToWrapAt));
wrappedLine.append(newLineStr);
offset = spaceToWrapAt + 1;
} else {
// really long word or URL
if (wrapLongWords) {
// wrap really long word one line at a time
wrappedLine.append(str.substring(offset, wrapLength + offset));
wrappedLine.append(newLineStr);
offset += wrapLength;
} else {
// do not wrap really long word, just extend beyond limit
spaceToWrapAt = str.indexOf(' ', wrapLength + offset);
if (spaceToWrapAt >= 0) {
wrappedLine.append(str.substring(offset, spaceToWrapAt));
wrappedLine.append(newLineStr);
offset = spaceToWrapAt + 1;
} else {
wrappedLine.append(str.substring(offset));
offset = inputLineLength;
}
}
}
}
// Whatever is left in line is short enough to just pass through
wrappedLine.append(str.substring(offset));
return wrappedLine.toString();
}
/**
* Extract the 'original' subject value, by ignoring leading
* response/forward marker and '[XX]' formatted tags (as many mailing-list
* softwares do).
*
* <p>
* Result is also trimmed.
* </p>
*
* @param subject
* Never <code>null</code>.
* @return Never <code>null</code>.
*/
public static String stripSubject(final String subject) {
int lastPrefix = 0;
final Matcher tagMatcher = TAG_PATTERN.matcher(subject);
String tag = null;
// whether tag stripping logic should be active
boolean tagPresent = false;
// whether the last action stripped a tag
boolean tagStripped = false;
if (tagMatcher.find(0)) {
tagPresent = true;
if (tagMatcher.start() == 0) {
// found at beginning of subject, considering it an actual tag
tag = tagMatcher.group();
// now need to find response marker after that tag
lastPrefix = tagMatcher.end();
tagStripped = true;
}
}
final Matcher matcher = RESPONSE_PATTERN.matcher(subject);
// while:
// - lastPrefix is within the bounds
// - response marker found at lastPrefix position
// (to make sure we don't catch response markers that are part of
// the actual subject)
while (lastPrefix < subject.length() - 1
&& matcher.find(lastPrefix)
&& matcher.start() == lastPrefix
&& (!tagPresent || tag == null || subject.regionMatches(matcher.end(), tag, 0,
tag.length()))) {
lastPrefix = matcher.end();
if (tagPresent) {
tagStripped = false;
if (tag == null) {
// attempt to find tag
if (tagMatcher.start() == lastPrefix) {
tag = tagMatcher.group();
lastPrefix += tag.length();
tagStripped = true;
}
} else if (lastPrefix < subject.length() - 1 && subject.startsWith(tag, lastPrefix)) {
// Re: [foo] Re: [foo] blah blah blah
// ^ ^
// ^ ^
// ^ new position
// ^
// initial position
lastPrefix += tag.length();
tagStripped = true;
}
}
}
// Null pointer check is to make the static analysis component of Eclipse happy.
if (tagStripped && (tag != null)) {
// restore the last tag
lastPrefix -= tag.length();
}
if (lastPrefix > -1 && lastPrefix < subject.length() - 1) {
return subject.substring(lastPrefix).trim();
} else {
return subject.trim();
}
}
private static final String IMG_SRC_REGEX = "(?is:<img[^>]+src\\s*=\\s*['\"]?([a-z]+)\\:)";
private static final Pattern IMG_PATTERN = Pattern.compile(IMG_SRC_REGEX);
/**
* Figure out if this part has images.
* TODO: should only return true if we're an html part
* @param message Content to evaluate
* @return True if it has external images; false otherwise.
*/
public static boolean hasExternalImages(final String message) {
Matcher imgMatches = IMG_PATTERN.matcher(message);
while (imgMatches.find()) {
String uriScheme = imgMatches.group(1);
if (uriScheme.equals("http") || uriScheme.equals("https")) {
if (K9.DEBUG) {
Log.d(K9.LOG_TAG, "External images found");
}
return true;
}
}
if (K9.DEBUG) {
Log.d(K9.LOG_TAG, "No external images.");
}
return false;
}
/**
* Unconditionally close a Cursor. Equivalent to {@link Cursor#close()},
* if cursor is non-null. This is typically used in finally blocks.
*
* @param cursor cursor to close
*/
public static void closeQuietly(final Cursor cursor) {
if (cursor != null) {
cursor.close();
}
}
/**
* Check to see if we have network connectivity.
*/
public static boolean hasConnectivity(final Context context) {
final ConnectivityManager connectivityManager =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivityManager == null) {
return false;
}
final NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();
if (netInfo != null && netInfo.getState() == NetworkInfo.State.CONNECTED) {
return true;
} else {
return false;
}
}
private static final Pattern MESSAGE_ID = Pattern.compile("<" +
"(?:" +
"[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~]+" +
"(?:\\.[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~]+)*" +
"|" +
"\"(?:[^\\\\\"]|\\\\.)*\"" +
")" +
"@" +
"(?:" +
"[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~]+" +
"(?:\\.[a-zA-Z0-9!#$%&'*+\\-/=?^_`{|}~]+)*" +
"|" +
"\\[(?:[^\\\\\\]]|\\\\.)*\\]" +
")" +
">");
public static List<String> extractMessageIds(final String text) {
List<String> messageIds = new ArrayList<String>();
Matcher matcher = MESSAGE_ID.matcher(text);
int start = 0;
while (matcher.find(start)) {
String messageId = text.substring(matcher.start(), matcher.end());
messageIds.add(messageId);
start = matcher.end();
}
return messageIds;
}
public static String extractMessageId(final String text) {
Matcher matcher = MESSAGE_ID.matcher(text);
if (matcher.find()) {
return text.substring(matcher.start(), matcher.end());
}
return null;
}
/**
* @return a {@link Handler} tied to the main thread.
*/
public static Handler getMainThreadHandler() {
if (sMainThreadHandler == null) {
// No need to synchronize -- it's okay to create an extra Handler, which will be used
// only once and then thrown away.
sMainThreadHandler = new Handler(Looper.getMainLooper());
}
return sMainThreadHandler;
}
}
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