206 lines
6.8 KiB
Java
206 lines
6.8 KiB
Java
/*
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* DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
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* Copyright (C) 2009 Mickael Guessant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package davmail.util;
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import org.apache.commons.codec.DecoderException;
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import org.apache.commons.codec.binary.Base64;
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import org.apache.commons.codec.binary.Hex;
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import java.util.Set;
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import java.util.regex.Pattern;
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/**
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* Various string handling methods
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*/
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public final class StringUtil {
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private StringUtil() {
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}
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/**
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* Return the sub string between startDelimiter and endDelimiter or null.
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*
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* @param value String value
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* @param startDelimiter start delimiter
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* @param endDelimiter end delimiter
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* @return token value
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*/
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public static String getToken(String value, String startDelimiter, String endDelimiter) {
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String token = null;
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if (value != null) {
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int startIndex = value.indexOf(startDelimiter);
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if (startIndex >= 0) {
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startIndex += startDelimiter.length();
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int endIndex = value.indexOf(endDelimiter, startIndex);
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if (endIndex >= 0) {
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token = value.substring(startIndex, endIndex);
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}
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}
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}
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return token;
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}
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/**
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* Return the sub string between startDelimiter and endDelimiter or null,
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* look for last token in string.
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*
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* @param value String value
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* @param startDelimiter start delimiter
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* @param endDelimiter end delimiter
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* @return token value
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*/
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public static String getLastToken(String value, String startDelimiter, String endDelimiter) {
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String token = null;
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if (value != null) {
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int startIndex = value.lastIndexOf(startDelimiter);
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if (startIndex >= 0) {
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startIndex += startDelimiter.length();
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int endIndex = value.indexOf(endDelimiter, startIndex);
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if (endIndex >= 0) {
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token = value.substring(startIndex, endIndex);
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}
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}
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}
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return token;
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}
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/**
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* Return the sub string between startDelimiter and endDelimiter with newToken.
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*
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* @param value String value
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* @param startDelimiter start delimiter
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* @param endDelimiter end delimiter
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* @param newToken new token value
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* @return token value
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*/
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public static String replaceToken(String value, String startDelimiter, String endDelimiter, String newToken) {
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String result = null;
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if (value != null) {
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int startIndex = value.indexOf(startDelimiter);
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if (startIndex >= 0) {
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startIndex += startDelimiter.length();
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int endIndex = value.indexOf(endDelimiter, startIndex);
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if (endIndex >= 0) {
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result = value.substring(0, startIndex) + newToken + value.substring(endIndex);
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}
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}
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}
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return result;
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}
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/**
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* Join values with given separator.
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*
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* @param values value set
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* @param separator separator
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* @return joined values
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*/
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public static String join(Set<String> values, String separator) {
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if (values != null && !values.isEmpty()) {
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StringBuilder result = new StringBuilder();
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for (String value : values) {
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if (result.length() > 0) {
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result.append(separator);
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}
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result.append(value);
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}
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return result.toString();
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} else {
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return null;
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}
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}
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private static final Pattern AMP_PATTERN = Pattern.compile("&");
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private static final Pattern LT_PATTERN = Pattern.compile("<");
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private static final Pattern GT_PATTERN = Pattern.compile(">");
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private static final Pattern ENCODED_AMP_PATTERN = Pattern.compile("&");
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private static final Pattern ENCODED_LT_PATTERN = Pattern.compile("<");
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private static final Pattern ENCODED_GT_PATTERN = Pattern.compile(">");
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/**
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* Need to encode xml for iCal
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*
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* @param name decoded name
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* @return name encoded name
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*/
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public static String xmlEncode(String name) {
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String result = name;
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if (name.indexOf('&') >= 0) {
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result = AMP_PATTERN.matcher(result).replaceAll("&");
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}
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if (name.indexOf('<') >= 0) {
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result = LT_PATTERN.matcher(result).replaceAll("<");
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}
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if (name.indexOf('>') >= 0) {
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result = GT_PATTERN.matcher(result).replaceAll(">");
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}
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return result;
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}
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/**
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* Need to decode xml for iCal
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*
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* @param name encoded name
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* @return name decoded name
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*/
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public static String xmlDecode(String name) {
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String result = name;
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if (name.indexOf("&") >= 0) {
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result = ENCODED_AMP_PATTERN.matcher(result).replaceAll("&");
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}
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if (name.indexOf("<") >= 0) {
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result = ENCODED_LT_PATTERN.matcher(result).replaceAll("<");
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}
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if (name.indexOf(">") >= 0) {
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result = ENCODED_GT_PATTERN.matcher(result).replaceAll(">");
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}
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return result;
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}
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/**
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* Convert base64 value to hex.
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*
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* @param value base64 value
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* @return hex value
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*/
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public static String base64ToHex(String value) {
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String hexValue = null;
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if (value != null) {
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hexValue = new String(Hex.encodeHex(Base64.decodeBase64(value.getBytes())));
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}
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return hexValue;
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}
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/**
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* Convert hex value to base64.
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*
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* @param value hex value
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* @return base64 value
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* @throws DecoderException on error
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*/
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public static String hexToBase64(String value) throws DecoderException {
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String base64Value = null;
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if (value != null) {
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base64Value = new String(Base64.encodeBase64(Hex.decodeHex(value.toCharArray())));
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}
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return base64Value;
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}
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}
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