dubbo.apache.org/dubbo-go/v3@v3.1.1/config/parsers/properties/properties.go (about)

     1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   * contributor license agreements.  See the NOTICE file distributed with
     4   * this work for additional information regarding copyright ownership.
     5   * The ASF licenses this file to You under the Apache License, Version 2.0
     6   * (the "License"); you may not use this file except in compliance with
     7   * the License.  You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17  
    18  package properties
    19  
    20  import (
    21  	"strings"
    22  )
    23  
    24  import (
    25  	"github.com/magiconair/properties"
    26  )
    27  
    28  type Properties struct{}
    29  
    30  func Parser() *Properties {
    31  	return &Properties{}
    32  }
    33  
    34  // Unmarshal parses the given properties bytes.
    35  func (p *Properties) Unmarshal(b []byte) (map[string]interface{}, error) {
    36  	out := make(map[string]interface{})
    37  	if load, err := properties.Load(b, properties.UTF8); err != nil {
    38  		return nil, err
    39  	} else {
    40  		// see viper#unmarshalReader
    41  		for _, key := range load.Keys() {
    42  			value, _ := load.Get(key)
    43  			// recursively build nested maps
    44  			path := strings.Split(key, ".")
    45  			lastKey := path[len(path)-1]
    46  			deepestMap := deepSearch(out, path[0:len(path)-1])
    47  			// set innermost value
    48  			deepestMap[lastKey] = value
    49  		}
    50  		return out, nil
    51  	}
    52  }
    53  
    54  // Marshal marshals the given config map to YAML bytes.
    55  func (p *Properties) Marshal(o map[string]interface{}) ([]byte, error) {
    56  	return nil, nil
    57  }
    58  
    59  // deepSearch scans deep maps, following the key indexes listed in the
    60  // sequence "path".
    61  // The last value is expected to be another map, and is returned.
    62  //
    63  // In case intermediate keys do not exist, or map to a non-map value,
    64  // a new map is created and inserted, and the search continues from there:
    65  // the initial map "m" may be modified!
    66  func deepSearch(m map[string]interface{}, path []string) map[string]interface{} {
    67  	for _, k := range path {
    68  		m2, ok := m[k]
    69  		if !ok {
    70  			// intermediate key does not exist
    71  			// => create it and continue from there
    72  			m3 := make(map[string]interface{})
    73  			m[k] = m3
    74  			m = m3
    75  			continue
    76  		}
    77  		m3, ok := m2.(map[string]interface{})
    78  		if !ok {
    79  			// intermediate key is a value
    80  			// => replace with a new map
    81  			m3 = make(map[string]interface{})
    82  			m[k] = m3
    83  		}
    84  		// continue search from here
    85  		m = m3
    86  	}
    87  	return m
    88  }