Java tutorial
/* * Copyright 2009 Red Hat, Inc. * * Red Hat 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. */ package com.trendrr.oss.networking.strest; import java.nio.charset.Charset; import java.util.concurrent.atomic.AtomicLong; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Originally in the netty project.. * @author <a href="http://www.jboss.org/netty/">The Netty Project</a> * @author Andy Taylor (andy.taylor@jboss.org) * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $ */ /** * @author Dustin Norlander * @created Mar 11, 2011 * * @deprecated use com.trendrr.oss.strest */ @Deprecated public class StrestUtil { private static AtomicLong txn = new AtomicLong(0l); public static String generateTxnId() { return "str" + Long.toHexString(txn.incrementAndGet()) + "st"; } protected static Log log = LogFactory.getLog(StrestUtil.class); /** * carriage return line feed */ static final String CRLF = "\r\n"; static final Charset DEFAULT_CHARSET = Charset.forName("utf8"); private StrestUtil() { super(); } static void validateHeaderName(String name) { if (name == null) { throw new NullPointerException("name"); } for (int i = 0; i < name.length(); i++) { char c = name.charAt(i); if (c > 127) { throw new IllegalArgumentException("name contains non-ascii character: " + name); } // Check prohibited characters. switch (c) { case '\t': case '\n': case 0x0b: case '\f': case '\r': case ' ': case ',': case ':': case ';': case '=': throw new IllegalArgumentException("name contains one of the following prohibited characters: " + "=,;: \\t\\r\\n\\v\\f: " + name); } } } static void validateHeaderValue(String value) { if (value == null) { throw new NullPointerException("value"); } // 0 - the previous character was neither CR nor LF // 1 - the previous character was CR // 2 - the previous character was LF int state = 0; for (int i = 0; i < value.length(); i++) { char c = value.charAt(i); // Check the absolutely prohibited characters. switch (c) { case 0x0b: // Vertical tab throw new IllegalArgumentException("value contains a prohibited character '\\v': " + value); case '\f': throw new IllegalArgumentException("value contains a prohibited character '\\f': " + value); } // Check the CRLF (HT | SP) pattern switch (state) { case 0: switch (c) { case '\r': state = 1; break; case '\n': state = 2; break; } break; case 1: switch (c) { case '\n': state = 2; break; default: throw new IllegalArgumentException("Only '\\n' is allowed after '\\r': " + value); } break; case 2: switch (c) { case '\t': case ' ': state = 0; break; default: throw new IllegalArgumentException("Only ' ' and '\\t' are allowed after '\\n': " + value); } } } if (state != 0) { throw new IllegalArgumentException("value must not end with '\\r' or '\\n':" + value); } } }