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+/*
+ * 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;
+ }
+ }
+}