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/*
 * @(#)Headers.java	1.4 07/01/02
 *
 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.net.httpserver;

import java.util.*;
import java.io.*;

/**
 * HTTP request and response headers are represented by this class which implements
 * the interface {@link java.util.Map}<
 * {@link java.lang.String},{@link java.util.List}<{@link java.lang.String}>>.
 * The keys are case-insensitive Strings representing the header names and
 * the value associated with each key is a {@link List}<{@link String}> with one
 * element for each occurence of the header name in the request or response.
 * 
 * For example, if a response header instance contains one key "HeaderName" with two values "value1 and value2"
 * then this object is output as two header lines:
 * 
 * HeaderName: value1
 * HeaderName: value2
 *


 * 
 * All the normal {@link java.util.Map} methods are provided, but the following 
 * additional convenience methods are most likely to be used:
 * 

 * {@link #getFirst(String)} returns a single valued header or the first value of
 * a multi-valued header.
 * {@link #add(String,String)} adds the given header value to the list for the given key
 * {@link #set(String,String)} sets the given header field to the single value given
 * overwriting any existing values in the value list.
 *

* All methods in this class accept null values for keys and values. However, null * keys will never will be present in HTTP request headers, and will not be output/sent in response headers. * Null values can be represented as either a null entry for the key (i.e. the list is null) or * where the key has a list, but one (or more) of the list's values is null. Null values are output * as a header line containing the key but no associated value. * @since 1.6 */ public class Headers implements Map> { HashMap> map; public Headers () {map = new HashMap>(32);} /* Normalize the key by converting to following form. * First char upper case, rest lower case. * key is presumed to be ASCII */ private String normalize (String key) { if (key == null) { return null; } int len = key.length(); if (len == 0) { return key; } char[] b = new char [len]; String s = null; b = key.toCharArray(); if (b[0] >= 'a' && b[0] <= 'z') { b[0] = (char)(b[0] - ('a' - 'A')); } for (int i=1; i= 'A' && b[i] <= 'Z') { b[i] = (char) (b[i] + ('a' - 'A')); } } s = new String (b); return s; } public int size() {return map.size();} public boolean isEmpty() {return map.isEmpty();} public boolean containsKey(Object key) { if (key == null) { return false; } if (!(key instanceof String)) { return false; } return map.containsKey (normalize((String)key)); } public boolean containsValue(Object value) { return map.containsValue(value); } public List get(Object key) { return map.get(normalize((String)key)); } /** * returns the first value from the List of String values * for the given key (if at least one exists). * @param key the key to search for * @return the first string value associated with the key */ public String getFirst (String key) { List l = map.get(normalize((String)key)); if (l == null) { return null; } return l.get(0); } public List put(String key, List value) { return map.put (normalize(key), value); } /** * adds the given value to the list of headers * for the given key. If the mapping does not * already exist, then it is created * @param key the header name * @param value the header value to add to the header */ public void add (String key, String value) { String k = normalize(key); List l = map.get(k); if (l == null) { l = new LinkedList(); map.put(k,l); } l.add (value); } /** * sets the given value as the sole header value * for the given key. If the mapping does not * already exist, then it is created * @param key the header name * @param value the header value to set. */ public void set (String key, String value) { LinkedList l = new LinkedList(); l.add (value); put (key, l); } public List remove(Object key) { return map.remove(normalize((String)key)); } public void putAll(Map> t) { map.putAll (t); } public void clear() {map.clear();} public Set keySet() {return map.keySet();} public Collection> values() {return map.values();} public Set>> entrySet() { return map.entrySet(); } public boolean equals(Object o) {return map.equals(o);} public int hashCode() {return map.hashCode();} }