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// Copyright 2010 The Go Authors.  All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package textproto

// A MIMEHeader represents a MIME-style header mapping

// keys to sets of values.

type MIMEHeader map[string][]string

// Add adds the key, value pair to the header.

// It appends to any existing values associated with key.

func (h MIMEHeader) Add(key, value string) {

        key = CanonicalMIMEHeaderKey(key)

        h[key] = append(h[key], value)

}

// Set sets the header entries associated with key to

// the single element value.  It replaces any existing

// values associated with key.

func (h MIMEHeader) Set(key, value string) {

        h[CanonicalMIMEHeaderKey(key)] = []string{value}

}

// Get gets the first value associated with the given key.

// If there are no values associated with the key, Get returns "".

// Get is a convenience method.  For more complex queries,

// access the map directly.

func (h MIMEHeader) Get(key string) string {

        if h == nil {

                return ""

        }

        v := h[CanonicalMIMEHeaderKey(key)]

        if len(v) == 0 {

                return ""

        }

        return v[0]

}

// Del deletes the values associated with key.

func (h MIMEHeader) Del(key string) {

        delete(h, CanonicalMIMEHeaderKey(key))

}