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// Copyright (c) 2015, Emir Pasic. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package treemap
import (
"github.com/emirpasic/gods/containers"
rbt "github.com/emirpasic/gods/trees/redblacktree"
)
func assertEnumerableImplementation() {
var _ containers.EnumerableWithKey = (*Map)(nil)
}
// Each calls the given function once for each element, passing that element's key and value.
func (m *Map) Each(f func(key interface{}, value interface{})) {
iterator := m.Iterator()
for iterator.Next() {
f(iterator.Key(), iterator.Value())
}
}
// Map invokes the given function once for each element and returns a container
// containing the values returned by the given function as key/value pairs.
func (m *Map) Map(f func(key1 interface{}, value1 interface{}) (interface{}, interface{})) *Map {
newMap := &Map{tree: rbt.NewWith(m.tree.Comparator)}
iterator := m.Iterator()
for iterator.Next() {
key2, value2 := f(iterator.Key(), iterator.Value())
newMap.Put(key2, value2)
}
return newMap
}
// Select returns a new container containing all elements for which the given function returns a true value.
func (m *Map) Select(f func(key interface{}, value interface{}) bool) *Map {
newMap := &Map{tree: rbt.NewWith(m.tree.Comparator)}
iterator := m.Iterator()
for iterator.Next() {
if f(iterator.Key(), iterator.Value()) {
newMap.Put(iterator.Key(), iterator.Value())
}
}
return newMap
}
// Any passes each element of the container to the given function and
// returns true if the function ever returns true for any element.
func (m *Map) Any(f func(key interface{}, value interface{}) bool) bool {
iterator := m.Iterator()
for iterator.Next() {
if f(iterator.Key(), iterator.Value()) {
return true
}
}
return false
}
// All passes each element of the container to the given function and
// returns true if the function returns true for all elements.
func (m *Map) All(f func(key interface{}, value interface{}) bool) bool {
iterator := m.Iterator()
for iterator.Next() {
if !f(iterator.Key(), iterator.Value()) {
return false
}
}
return true
}
// Find passes each element of the container to the given function and returns
// the first (key,value) for which the function is true or nil,nil otherwise if no element
// matches the criteria.
func (m *Map) Find(f func(key interface{}, value interface{}) bool) (interface{}, interface{}) {
iterator := m.Iterator()
for iterator.Next() {
if f(iterator.Key(), iterator.Value()) {
return iterator.Key(), iterator.Value()
}
}
return nil, nil
}
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