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Diffstat (limited to 'simple/simple-http/src/main/java/org/simpleframework/http/message/MessageHeader.java')
-rw-r--r-- | simple/simple-http/src/main/java/org/simpleframework/http/message/MessageHeader.java | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/simple/simple-http/src/main/java/org/simpleframework/http/message/MessageHeader.java b/simple/simple-http/src/main/java/org/simpleframework/http/message/MessageHeader.java new file mode 100644 index 0000000..b809efe --- /dev/null +++ b/simple/simple-http/src/main/java/org/simpleframework/http/message/MessageHeader.java @@ -0,0 +1,477 @@ +/* + * Message.java February 2007 + * + * Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net> + * + * 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 org.simpleframework.http.message; + +import java.util.LinkedList; +import java.util.List; + +import org.simpleframework.common.KeyMap; +import org.simpleframework.http.Cookie; +import org.simpleframework.http.parse.DateParser; +import org.simpleframework.http.parse.ValueParser; + +/** + * The <code>Message</code> object is used to store an retrieve the + * headers for both a request and response. Headers are stored and + * retrieved in a case insensitive manner according to RFC 2616. + * The message also allows multiple header values to be added to a + * single header name, headers such as Cookie and Set-Cookie can be + * added multiple times with different values. + * + * @author Niall Gallagher + */ +public class MessageHeader implements Message { + + /** + * This is used to store the cookies added to the HTTP header. + */ + private final KeyMap<Cookie> cookies; + + /** + * This is used to store multiple header values for a name. + */ + private final KeyMap<Series> values; + + /** + * This is used to store the individual names for the header. + */ + private final KeyMap<String> names; + + /** + * This is used to parse all date headers added to the message. + */ + private final DateParser parser; + + /** + * Constructor for the <code>Message</code> object. This is used + * to create a case insensitive means for storing HTTP header + * names and values. Dates can also be added to message as a + * long value and is converted to RFC 1123 compliant date string. + */ + public MessageHeader() { + this.cookies = new KeyMap<Cookie>(); + this.values = new KeyMap<Series>(); + this.names = new KeyMap<String>(); + this.parser = new DateParser(); + } + + /** + * This is used to acquire the names of the of the headers that + * have been set in the response. This can be used to acquire all + * header values by name that have been set within the response. + * If no headers have been set this will return an empty list. + * + * @return a list of strings representing the set header names + */ + public List<String> getNames() { + return names.getValues(); + } + + /** + * This can be used to set a HTTP message header to this object. + * The name and value of the HTTP message header will be used to + * create a HTTP message header object which can be retrieved using + * the <code>getValue</code> in combination with the get methods. + * This will perform a <code>remove</code> using the issued header + * name before the header value is set. + * + * @param name the name of the HTTP message header to be added + * @param value the value the HTTP message header will have + */ + public void setValue(String name, String value) { + List<String> list = getAll(name); + + if(value == null) { + String token = name.toLowerCase(); + + values.remove(token); + names.remove(token); + } else { + list.clear(); + list.add(value); + } + } + + /** + * This can be used to set a HTTP message header to this object. + * The name and value of the HTTP message header will be used to + * create a HTTP message header object which can be retrieved using + * the <code>getValue</code> in combination with the get methods. + * This will perform a <code>remove</code> using the issued header + * name before the header value is set. + * + * @param name the name of the HTTP message header to be added + * @param value the value the HTTP message header will have + */ + public void setInteger(String name, int value) { + setValue(name, String.valueOf(value)); + } + + /** + * This can be used to set a HTTP message header to this object. + * The name and value of the HTTP message header will be used to + * create a HTTP message header object which can be retrieved using + * the <code>getValue</code> in combination with the get methods. + * This will perform a <code>remove</code> using the issued header + * name before the header value is set. + * + * @param name the name of the HTTP message header to be added + * @param value the value the HTTP message header will have + */ + public void setLong(String name, long value) { + setValue(name, String.valueOf(value)); + } + + /** + * This is used as a convenience method for adding a header that + * needs to be parsed into a HTTP date string. This will convert + * the date given into a date string defined in RFC 2616 sec 3.3.1. + * This will perform a <code>remove</code> using the issued header + * name before the header value is set. + * + * @param name the name of the HTTP message header to be added + * @param date the value constructed as an RFC 1123 date string + */ + public void setDate(String name, long date) { + setValue(name, parser.convert(date)); + } + + /** + * This can be used to add a HTTP message header to this object. + * The name and value of the HTTP message header will be used to + * create a HTTP message header object which can be retrieved using + * the <code>getValue</code> in combination with the get methods. + * + * @param name the name of the HTTP message header to be added + * @param value the value the HTTP message header will have + */ + public void addValue(String name, String value) { + List<String> list = getAll(name); + + if(value != null) { + list.add(value); + } + } + + /** + * This can be used to add a HTTP message header to this object. + * The name and value of the HTTP message header will be used to + * create a HTTP message header object which can be retrieved using + * the <code>getInteger</code> in combination with the get methods. + * + * @param name the name of the HTTP message header to be added + * @param value the value the HTTP message header will have + */ + public void addInteger(String name, int value) { + addValue(name, String.valueOf(value)); + } + + /** + * This is used as a convenience method for adding a header that + * needs to be parsed into a HTTPdate string. This will convert + * the date given into a date string defined in RFC 2616 sec 3.3.1. + * + * @param name the name of the HTTP message header to be added + * @param date the value constructed as an RFC 1123 date string + */ + public void addDate(String name, long date) { + addValue(name, parser.convert(date)); + } + + /** + * This can be used to get the value of the first message header + * that has the specified name. This will return the full string + * representing the named header value. If the named header does + * not exist then this will return a null value. + * + * @param name the HTTP message header to get the value from + * + * @return this returns the value that the HTTP message header + */ + public String getValue(String name) { + return getValue(name, 0); + } + + /** + * This can be used to get the value of the first message header + * that has the specified name. This will return the full string + * representing the named header value. If the named header does + * not exist then this will return a null value. + * + * @param name the HTTP message header to get the value from + * @param index this is the index to get the value from + * + * @return this returns the value that the HTTP message header + */ + public String getValue(String name, int index) { + List<String> list = getAll(name); + + if(list.size() > index) { + return list.get(index); + } + return null; + } + + /** + * This can be used to get the value of the first message header + * that has the specified name. This will return the integer + * representing the named header value. If the named header does + * not exist then this will return a value of minus one, -1. + * + * @param name the HTTP message header to get the value from + * + * @return this returns the value that the HTTP message header + */ + public int getInteger(String name) { + String value = getValue(name); + + if(value == null) { + return -1; + } + return Integer.parseInt(value); + } + + /** + * This can be used to get the value of the first message header + * that has the specified name. This will return the long + * representing the named header value. If the named header does + * not exist then this will return a value of minus one, -1. + * + * @param name the HTTP message header to get the value from + * + * @return this returns the value that the HTTP message header + */ + public long getLong(String name) { + String value = getValue(name); + + if(value == null) { + return -1L; + } + return Long.parseLong(value); + } + + /** + * This can be used to get the value of the first message header + * that has the specified name. This will return the long value + * representing the named header value. If the named header does + * not exist then this will return a value of minus one, -1. + * + * @param name the HTTP message header to get the value from + * + * @return this returns the value that the HTTP message header + */ + public long getDate(String name) { + String value = getValue(name); + + if(value == null) { + return -1; + } + return parser.convert(value); + } + + /** + * This returns the <code>Cookie</code> object stored under the + * specified name. This is used to retrieve cookies that have been + * set with the <code>setCookie</code> methods. If the cookie does + * not exist under the specified name this will return null. + * + * @param name this is the name of the cookie to be retrieved + * + * @return returns the <code>Cookie</code> by the given name + */ + public Cookie getCookie(String name) { + return cookies.get(name); + } + + /** + * This returns all <code>Cookie</code> objects stored under the + * specified name. This is used to retrieve cookies that have been + * set with the <code>setCookie</code> methods. If there are no + * cookies then this will return an empty list. + * + * @return returns all the <code>Cookie</code> in the response + */ + public List<Cookie> getCookies() { + return cookies.getValues(); + } + + /** + * The <code>setCookie</code> method is used to set a cookie value + * with the cookie name. This will add a cookie to the response + * stored under the name of the cookie, when this is committed it + * will be added as a Set-Cookie header to the resulting response. + * This is a convenience method that avoids cookie creation. + * + * @param name this is the cookie to be added to the response + * @param value this is the cookie value that is to be used + * + * @return returns the cookie that has been set in the response + */ + public Cookie setCookie(String name, String value) { + return setCookie(new Cookie(name, value, true)); + } + + /** + * The <code>setCookie</code> method is used to set a cookie value + * with the cookie name. This will add a cookie to the response + * stored under the name of the cookie, when this is committed it + * will be added as a Set-Cookie header to the resulting response. + * + * @param cookie this is the cookie to be added to the response + * + * @return returns the cookie that has been set in the response + */ + public Cookie setCookie(Cookie cookie) { + String name = cookie.getName(); + + if(name != null) { + cookies.put(name, cookie); + } + return cookie; + } + + /** + * This can be used to get the values of HTTP message headers + * that have the specified name. This is a convenience method that + * will present that values as tokens extracted from the header. + * This has obvious performance benefits as it avoids having to + * deal with <code>substring</code> and <code>trim</code> calls. + * <p> + * The tokens returned by this method are ordered according to + * there HTTP quality values, or "q" values, see RFC 2616 section + * 3.9. This also strips out the quality parameter from tokens + * returned. So "image/html; q=0.9" results in "image/html". If + * there are no "q" values present then order is by appearance. + * <p> + * The result from this is either the trimmed header value, that + * is, the header value with no leading or trailing whitespace + * or an array of trimmed tokens ordered with the most preferred + * in the lower indexes, so index 0 is has highest preference. + * + * @param name the name of the headers that are to be retrieved + * + * @return ordered list of tokens extracted from the header(s) + */ + public List<String> getValues(String name) { + return getValues(getAll(name)); + } + + /** + * This can be used to get the values of HTTP message headers + * that have the specified name. This is a convenience method that + * will present that values as tokens extracted from the header. + * This has obvious performance benefits as it avoids having to + * deal with <code>substring</code> and <code>trim</code> calls. + * <p> + * The tokens returned by this method are ordered according to + * there HTTP quality values, or "q" values, see RFC 2616 section + * 3.9. This also strips out the quality parameter from tokens + * returned. So "image/html; q=0.9" results in "image/html". If + * there are no "q" values present then order is by appearance. + * <p> + * The result from this is either the trimmed header value, that + * is, the header value with no leading or trailing whitespace + * or an array of trimmed tokens ordered with the most preferred + * in the lower indexes, so index 0 is has highest preference. + * + * @param list this is the list of individual header values + * + * @return ordered list of tokens extracted from the header(s) + */ + public List<String> getValues(List<String> list) { + return new ValueParser(list).list(); + } + + /** + * This is used to acquire all the individual header values from + * the message. The header values provided by this are unparsed + * and represent the actual string values that have been added to + * the message keyed by a given header name. + * + * @param name the name of the header to get the values for + * + * @return this returns a list of the values for the header name + */ + public List<String> getAll(String name) { + String token = name.toLowerCase(); + Series series = values.get(token); + + if(series == null) { + return getAll(name, token); + } + return series.getValues(); + } + + /** + * This is used to acquire all the individual header values from + * the message. The header values provided by this are unparsed + * and represent the actual string values that have been added to + * the message keyed by a given header name. + * + * @param name the name of the header to get the values for + * @param token this provides a lower case version of the header + * + * @return this returns a list of the values for the header name + */ + private List<String> getAll(String name, String token) { + Series series = new Series(); + String value = names.get(token); + + if(value == null) { + names.put(token, name); + } + values.put(token, series); + + return series.getValues(); + } + + /** + * The <code>Series</code> object is used to represent a list of + * HTTP header value for a given name. It allows multiple values + * to exist for a given header, such as the Cookie header. Most + * entries will contain a single value. + */ + private class Series { + + /** + * Contains the header values that belong to the entry name. + */ + private List<String> value; + + /** + * Constructor for the <code>Entry</code> object. The entry is + * created using the name of the HTTP header. Values can be + * added to the entry list in order to build up the header. + */ + public Series() { + this.value = new LinkedList<String>(); + } + + /** + * This returns the list of header values associated with the + * header name. Each value is added as an individual header + * prefixed by the header name and a semicolon character. + * + * @return this returns the list of values for the header + */ + public List<String> getValues() { + return value; + } + } +} |