com.sun.jersey.core.header.GrammarUtil Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation
Show all versions of ehcache Show documentation
Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2011-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.jersey.core.header;
/**
* Class containing static utility methods to work with HTTP headers.
*
* @author Paul Sandoz
* @author Martin Matula
*/
public final class GrammarUtil {
/** Represents token type in the TYPE_TABLE */
public static final int TOKEN = 0;
/** Represents quotes type in the TYPE_TABLE */
public static final int QUOTED_STRING = 1;
/** Represents comment type in the TYPE_TABLE */
public static final int COMMENT = 2;
/** Represents separator type in the TYPE_TABLE */
public static final int SEPARATOR = 3;
/** Represents control type in the TYPE_TABLE */
public static final int CONTROL = 4;
/** Array of chars representing white spaces */
public static final char[] WHITE_SPACE = {'\t', '\r', '\n', ' '};
/** Array of chars representing separators */
public static final char[] SEPARATORS = {'(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=', '{', '}', ' ', '\t'};
/** Mapping of chars to types */
public static final int[] TYPE_TABLE = createEventTable();
/** Convenience table mapping chars to true if they are white space chars */
public static final boolean[] IS_WHITE_SPACE = createWhiteSpaceTable();
/** convenience table mapping chars to true if they are tokens */
public static final boolean[] IS_TOKEN = createTokenTable();
private static int[] createEventTable() {
int[] table = new int[128];
// Token
for (int i = 0; i < 127; i++) {
table[i] = TOKEN;
}
// Separator
for (char c : SEPARATORS) {
table[c] = SEPARATOR;
}
// Comment
table['('] = COMMENT;
// QuotedString
table['"'] = QUOTED_STRING;
// Control
for (int i = 0; i < 32; i++) {
table[i] = CONTROL;
}
table[127] = CONTROL;
// White space
for (char c : WHITE_SPACE) {
table[c] = -1;
}
return table;
}
private static boolean[] createWhiteSpaceTable() {
boolean[] table = new boolean[128];
for (char c : WHITE_SPACE) {
table[c] = true;
}
return table;
}
private static boolean[] createTokenTable() {
boolean[] table = new boolean[128];
for (int i = 0; i < 128; i++) {
table[i] = (TYPE_TABLE[i] == TOKEN);
}
return table;
}
/**
* Returns true if the provided char is a white space.
*
* @param c char to check
* @return true if c is a white space
*/
public static boolean isWhiteSpace(char c) {
return (c < 128 && IS_WHITE_SPACE[c]);
}
/**
* Returns true if the provided char is a token.
* @param c char to check
* @return true if c is a token
*/
public static boolean isToken(char c) {
return (c < 128 && IS_TOKEN[c]);
}
/**
* Returns true if all chars in string s are tokens.
* @param s string to check for tokens
* @return true if all chars in s are tokens
*/
public static boolean isTokenString(String s) {
for (char c : s.toCharArray()) {
if (!isToken(c)) {
return false;
}
}
return true;
}
/**
* Returns true if string s contains a white space char.
* @param s string to check for white spaces
* @return true if s contains white spaces
*/
public static boolean containsWhiteSpace(String s) {
for (char c : s.toCharArray()) {
if (isWhiteSpace(c)) {
return true;
}
}
return false;
}
public static String filterToken(String s, int start, int end) {
return filterToken(s, start, end, false);
}
public static String filterToken(String s, int start, int end, boolean preserveBackslash) {
StringBuilder sb = new StringBuilder();
char c;
boolean gotEscape = false;
boolean gotCR = false;
for (int i = start; i < end; i++) {
c = s.charAt(i);
if (c == '\n' && gotCR) {
// This LF is part of an unescaped
// CRLF sequence (i.e, LWSP). Skip it.
gotCR = false;
continue;
}
gotCR = false;
if (!gotEscape) {
// Previous character was NOT '\'
// preserveBackslash = fix for http://java.net/jira/browse/JERSEY-759
if (!preserveBackslash && c == '\\') { // skip this character
gotEscape = true;
} else if (c == '\r') { // skip this character
gotCR = true;
} else { // append this character
sb.append(c);
}
} else {
// Previous character was '\'. So no need to
// bother with any special processing, just
// append this character
sb.append(c);
gotEscape = false;
}
}
return sb.toString();
}
}