gitee.com/quant1x/gox@v1.21.2/util/linkedhashmap/enumerable.go (about)

     1  // Copyright (c) 2015, Emir Pasic. 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 linkedhashmap
     6  
     7  import (
     8  	"gitee.com/quant1x/gox/util/internal"
     9  )
    10  
    11  func assertEnumerableImplementation() {
    12  	var _ internal.EnumerableWithKey = (*Map)(nil)
    13  }
    14  
    15  // Each calls the given function once for each element, passing that element's key and value.
    16  func (m *Map) Each(f func(key interface{}, value interface{})) {
    17  	iterator := m.Iterator()
    18  	for iterator.Next() {
    19  		f(iterator.Key(), iterator.Value())
    20  	}
    21  }
    22  
    23  // Map invokes the given function once for each element and returns a container
    24  // containing the values returned by the given function as key/value pairs.
    25  func (m *Map) Map(f func(key1 interface{}, value1 interface{}) (interface{}, interface{})) *Map {
    26  	newMap := New()
    27  	iterator := m.Iterator()
    28  	for iterator.Next() {
    29  		key2, value2 := f(iterator.Key(), iterator.Value())
    30  		newMap.Put(key2, value2)
    31  	}
    32  	return newMap
    33  }
    34  
    35  // Select returns a new container containing all elements for which the given function returns a true value.
    36  func (m *Map) Select(f func(key interface{}, value interface{}) bool) *Map {
    37  	newMap := New()
    38  	iterator := m.Iterator()
    39  	for iterator.Next() {
    40  		if f(iterator.Key(), iterator.Value()) {
    41  			newMap.Put(iterator.Key(), iterator.Value())
    42  		}
    43  	}
    44  	return newMap
    45  }
    46  
    47  // Any passes each element of the container to the given function and
    48  // returns true if the function ever returns true for any element.
    49  func (m *Map) Any(f func(key interface{}, value interface{}) bool) bool {
    50  	iterator := m.Iterator()
    51  	for iterator.Next() {
    52  		if f(iterator.Key(), iterator.Value()) {
    53  			return true
    54  		}
    55  	}
    56  	return false
    57  }
    58  
    59  // All passes each element of the container to the given function and
    60  // returns true if the function returns true for all elements.
    61  func (m *Map) All(f func(key interface{}, value interface{}) bool) bool {
    62  	iterator := m.Iterator()
    63  	for iterator.Next() {
    64  		if !f(iterator.Key(), iterator.Value()) {
    65  			return false
    66  		}
    67  	}
    68  	return true
    69  }
    70  
    71  // Find passes each element of the container to the given function and returns
    72  // the first (key,value) for which the function is true or nil,nil otherwise if no element
    73  // matches the criteria.
    74  func (m *Map) Find(f func(key interface{}, value interface{}) bool) (interface{}, interface{}) {
    75  	iterator := m.Iterator()
    76  	for iterator.Next() {
    77  		if f(iterator.Key(), iterator.Value()) {
    78  			return iterator.Key(), iterator.Value()
    79  		}
    80  	}
    81  	return nil, nil
    82  }