/*
* Copyright (C) 2012 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.utils;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
/** Miscellaneous utilities used by the Android SDK tools */
public class SdkUtils {
/**
* Returns true if the given string ends with the given suffix, using a
* case-insensitive comparison.
*
* @param string the full string to be checked
* @param suffix the suffix to be checked for
* @return true if the string case-insensitively ends with the given suffix
*/
public static boolean endsWithIgnoreCase(String string, String suffix) {
return string.regionMatches(true /* ignoreCase */, string.length() - suffix.length(),
suffix, 0, suffix.length());
}
/**
* Returns true if the given sequence ends with the given suffix (case
* sensitive).
*
* @param sequence the character sequence to be checked
* @param suffix the suffix to look for
* @return true if the given sequence ends with the given suffix
*/
public static boolean endsWith(CharSequence sequence, CharSequence suffix) {
return endsWith(sequence, sequence.length(), suffix);
}
/**
* Returns true if the given sequence ends at the given offset with the given suffix (case
* sensitive)
*
* @param sequence the character sequence to be checked
* @param endOffset the offset at which the sequence is considered to end
* @param suffix the suffix to look for
* @return true if the given sequence ends with the given suffix
*/
public static boolean endsWith(CharSequence sequence, int endOffset, CharSequence suffix) {
if (endOffset < suffix.length()) {
return false;
}
for (int i = endOffset - 1, j = suffix.length() - 1; j >= 0; i--, j--) {
if (sequence.charAt(i) != suffix.charAt(j)) {
return false;
}
}
return true;
}
/**
* Returns true if the given string starts with the given prefix, using a
* case-insensitive comparison.
*
* @param string the full string to be checked
* @param prefix the prefix to be checked for
* @return true if the string case-insensitively starts with the given prefix
*/
public static boolean startsWithIgnoreCase(String string, String prefix) {
return string.regionMatches(true /* ignoreCase */, 0, prefix, 0, prefix.length());
}
/**
* Returns true if the given string starts at the given offset with the
* given prefix, case insensitively.
*
* @param string the full string to be checked
* @param offset the offset in the string to start looking
* @param prefix the prefix to be checked for
* @return true if the string case-insensitively starts at the given offset
* with the given prefix
*/
public static boolean startsWith(String string, int offset, String prefix) {
return string.regionMatches(true /* ignoreCase */, offset, prefix, 0, prefix.length());
}
/**
* Strips the whitespace from the given string
*
* @param string the string to be cleaned up
* @return the string, without whitespace
*/
public static String stripWhitespace(String string) {
StringBuilder sb = new StringBuilder(string.length());
for (int i = 0, n = string.length(); i < n; i++) {
char c = string.charAt(i);
if (!Character.isWhitespace(c)) {
sb.append(c);
}
}
return sb.toString();
}
/**
* Returns true if the given string has an upper case character.
*
* @param s the string to check
* @return true if it contains uppercase characters
*/
public static boolean hasUpperCaseCharacter(String s) {
for (int i = 0; i < s.length(); i++) {
if (Character.isUpperCase(s.charAt(i))) {
return true;
}
}
return false;
}
/** For use by {@link #getLineSeparator()} */
private static String sLineSeparator;
/**
* Returns the default line separator to use.
* <p>
* NOTE: If you have an associated IDocument (Eclipse), it is better to call
* TextUtilities#getDefaultLineDelimiter(IDocument) since that will
* allow (for example) editing a \r\n-delimited document on a \n-delimited
* platform and keep a consistent usage of delimiters in the file.
*
* @return the delimiter string to use
*/
@NonNull
public static String getLineSeparator() {
if (sLineSeparator == null) {
// This is guaranteed to exist:
sLineSeparator = System.getProperty("line.separator"); //$NON-NLS-1$
}
return sLineSeparator;
}
/**
* Wraps the given text at the given line width, with an optional hanging
* indent.
*
* @param text the text to be wrapped
* @param lineWidth the number of characters to wrap the text to
* @param hangingIndent the hanging indent (to be used for the second and
* subsequent lines in each paragraph, or null if not known
* @return the string, wrapped
*/
@NonNull
public static String wrap(
@NonNull String text,
int lineWidth,
@Nullable String hangingIndent) {
if (hangingIndent == null) {
hangingIndent = "";
}
int explanationLength = text.length();
StringBuilder sb = new StringBuilder(explanationLength * 2);
int index = 0;
while (index < explanationLength) {
int lineEnd = text.indexOf('\n', index);
int next;
if (lineEnd != -1 && (lineEnd - index) < lineWidth) {
next = lineEnd + 1;
} else {
// Line is longer than available width; grab as much as we can
lineEnd = Math.min(index + lineWidth, explanationLength);
if (lineEnd - index < lineWidth) {
next = explanationLength;
} else {
// then back up to the last space
int lastSpace = text.lastIndexOf(' ', lineEnd);
if (lastSpace > index) {
lineEnd = lastSpace;
next = lastSpace + 1;
} else {
// No space anywhere on the line: it contains something wider than
// can fit (like a long URL) so just hard break it
next = lineEnd + 1;
}
}
}
if (sb.length() > 0) {
sb.append(hangingIndent);
} else {
lineWidth -= hangingIndent.length();
}
sb.append(text.substring(index, lineEnd));
sb.append('\n');
index = next;
}
return sb.toString();
}
}