github.com/dannin/go@v0.0.0-20161031215817-d35dfd405eaa/src/net/textproto/header.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package textproto
     6  
     7  // A MIMEHeader represents a MIME-style header mapping
     8  // keys to sets of values.
     9  type MIMEHeader map[string][]string
    10  
    11  // Add adds the key, value pair to the header.
    12  // It appends to any existing values associated with key.
    13  func (h MIMEHeader) Add(key, value string) {
    14  	key = CanonicalMIMEHeaderKey(key)
    15  	h[key] = append(h[key], value)
    16  }
    17  
    18  // Set sets the header entries associated with key to
    19  // the single element value. It replaces any existing
    20  // values associated with key.
    21  func (h MIMEHeader) Set(key, value string) {
    22  	h[CanonicalMIMEHeaderKey(key)] = []string{value}
    23  }
    24  
    25  // Get gets the first value associated with the given key.
    26  // If there are no values associated with the key, Get returns "".
    27  // Get is a convenience method. For more complex queries,
    28  // access the map directly.
    29  func (h MIMEHeader) Get(key string) string {
    30  	if h == nil {
    31  		return ""
    32  	}
    33  	v := h[CanonicalMIMEHeaderKey(key)]
    34  	if len(v) == 0 {
    35  		return ""
    36  	}
    37  	return v[0]
    38  }
    39  
    40  // Del deletes the values associated with key.
    41  func (h MIMEHeader) Del(key string) {
    42  	delete(h, CanonicalMIMEHeaderKey(key))
    43  }