github.com/boki/go-xmp@v1.0.1/models/cc/model.go (about)

     1  // Copyright (c) 2017-2018 Alexander Eichhorn
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License"): you may
     4  // not use this file except in compliance with the License. You may obtain
     5  // a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    11  // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    12  // License for the specific language governing permissions and limitations
    13  // under the License.
    14  
    15  // Creative Commons Metadata
    16  //
    17  // - URL: https://wiki.creativecommons.org/wiki/XMP
    18  // - Namespace: http://creativecommons.org/ns#
    19  // - prefix: cc
    20  
    21  // Package cc implements Creative Commons licensing metadata.
    22  package cc
    23  
    24  import (
    25  	"fmt"
    26  	"trimmer.io/go-xmp/xmp"
    27  )
    28  
    29  var (
    30  	NsCC = xmp.NewNamespace("cc", "http://creativecommons.org/ns#", NewModel)
    31  )
    32  
    33  func init() {
    34  	xmp.Register(NsCC, xmp.RightsMetadata)
    35  }
    36  
    37  func NewModel(name string) xmp.Model {
    38  	return &CC{}
    39  }
    40  
    41  func MakeModel(d *xmp.Document) (*CC, error) {
    42  	m, err := d.MakeModel(NsCC)
    43  	if err != nil {
    44  		return nil, err
    45  	}
    46  	x, _ := m.(*CC)
    47  	return x, nil
    48  }
    49  
    50  func FindModel(d *xmp.Document) *CC {
    51  	if m := d.FindModel(NsCC); m != nil {
    52  		return m.(*CC)
    53  	}
    54  	return nil
    55  }
    56  
    57  type CC struct {
    58  	License         xmp.Uri `xmp:"cc:license"`
    59  	MorePermissions xmp.Uri `xmp:"cc:morePermissions"`
    60  	AttributionURL  xmp.Uri `xmp:"cc:attributionURL"`
    61  	AttributionName string  `xmp:"cc:attributionName"`
    62  }
    63  
    64  func (x CC) Can(nsName string) bool {
    65  	return NsCC.GetName() == nsName
    66  }
    67  
    68  func (x CC) Namespaces() xmp.NamespaceList {
    69  	return xmp.NamespaceList{NsCC}
    70  }
    71  
    72  func (x *CC) SyncModel(d *xmp.Document) error {
    73  	return nil
    74  }
    75  
    76  func (x *CC) SyncFromXMP(d *xmp.Document) error {
    77  	return nil
    78  }
    79  
    80  func (x CC) SyncToXMP(d *xmp.Document) error {
    81  	return nil
    82  }
    83  
    84  func (x *CC) CanTag(tag string) bool {
    85  	_, err := xmp.GetNativeField(x, tag)
    86  	return err == nil
    87  }
    88  
    89  func (x *CC) GetTag(tag string) (string, error) {
    90  	if v, err := xmp.GetNativeField(x, tag); err != nil {
    91  		return "", fmt.Errorf("%s: %v", NsCC.GetName(), err)
    92  	} else {
    93  		return v, nil
    94  	}
    95  }
    96  
    97  func (x *CC) SetTag(tag, value string) error {
    98  	if err := xmp.SetNativeField(x, tag, value); err != nil {
    99  		return fmt.Errorf("%s: %v", NsCC.GetName(), err)
   100  	}
   101  	return nil
   102  }