containers

package
Version: v1.18.1 Latest Latest
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Published: Apr 18, 2022 License: BSD-2-Clause, ISC Imports: 1 Imported by: 818

Documentation

Overview

Package containers provides core interfaces and functions for data structures.

Container is the base interface for all data structures to implement.

Iterators provide stateful iterators.

Enumerable provides Ruby inspired (each, select, map, find, any?, etc.) container functions.

Serialization provides serializers (marshalers) and deserializers (unmarshalers).

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func GetSortedValues

func GetSortedValues(container Container, comparator utils.Comparator) []interface{}

GetSortedValues returns sorted container's elements with respect to the passed comparator. Does not affect the ordering of elements within the container.

Types

type Container

type Container interface {
	Empty() bool
	Size() int
	Clear()
	Values() []interface{}
	String() string
}

Container is base interface that all data structures implement.

type EnumerableWithIndex

type EnumerableWithIndex interface {
	// Each calls the given function once for each element, passing that element's index and value.
	Each(func(index int, value interface{}))

	// Any passes each element of the container to the given function and
	// returns true if the function ever returns true for any element.
	Any(func(index int, value interface{}) bool) bool

	// All passes each element of the container to the given function and
	// returns true if the function returns true for all elements.
	All(func(index int, value interface{}) bool) bool

	// Find passes each element of the container to the given function and returns
	// the first (index,value) for which the function is true or -1,nil otherwise
	// if no element matches the criteria.
	Find(func(index int, value interface{}) bool) (int, interface{})
}

EnumerableWithIndex provides functions for ordered containers whose values can be fetched by an index.

type EnumerableWithKey

type EnumerableWithKey interface {
	// Each calls the given function once for each element, passing that element's key and value.
	Each(func(key interface{}, value interface{}))

	// Any passes each element of the container to the given function and
	// returns true if the function ever returns true for any element.
	Any(func(key interface{}, value interface{}) bool) bool

	// All passes each element of the container to the given function and
	// returns true if the function returns true for all elements.
	All(func(key interface{}, value interface{}) bool) bool

	// 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.
	Find(func(key interface{}, value interface{}) bool) (interface{}, interface{})
}

EnumerableWithKey provides functions for ordered containers whose values whose elements are key/value pairs.

type IteratorWithIndex

type IteratorWithIndex interface {
	// Next moves the iterator to the next element and returns true if there was a next element in the container.
	// If Next() returns true, then next element's index and value can be retrieved by Index() and Value().
	// If Next() was called for the first time, then it will point the iterator to the first element if it exists.
	// Modifies the state of the iterator.
	Next() bool

	// Value returns the current element's value.
	// Does not modify the state of the iterator.
	Value() interface{}

	// Index returns the current element's index.
	// Does not modify the state of the iterator.
	Index() int

	// Begin resets the iterator to its initial state (one-before-first)
	// Call Next() to fetch the first element if any.
	Begin()

	// First moves the iterator to the first element and returns true if there was a first element in the container.
	// If First() returns true, then first element's index and value can be retrieved by Index() and Value().
	// Modifies the state of the iterator.
	First() bool

	// NextTo moves the iterator to the next element from current position that satisfies the condition given by the
	// passed function, and returns true if there was a next element in the container.
	// If NextTo() returns true, then next element's index and value can be retrieved by Index() and Value().
	// Modifies the state of the iterator.
	NextTo(func(index int, value interface{}) bool) bool
}

IteratorWithIndex is stateful iterator for ordered containers whose values can be fetched by an index.

type IteratorWithKey

type IteratorWithKey interface {
	// Next moves the iterator to the next element and returns true if there was a next element in the container.
	// If Next() returns true, then next element's key and value can be retrieved by Key() and Value().
	// If Next() was called for the first time, then it will point the iterator to the first element if it exists.
	// Modifies the state of the iterator.
	Next() bool

	// Value returns the current element's value.
	// Does not modify the state of the iterator.
	Value() interface{}

	// Key returns the current element's key.
	// Does not modify the state of the iterator.
	Key() interface{}

	// Begin resets the iterator to its initial state (one-before-first)
	// Call Next() to fetch the first element if any.
	Begin()

	// First moves the iterator to the first element and returns true if there was a first element in the container.
	// If First() returns true, then first element's key and value can be retrieved by Key() and Value().
	// Modifies the state of the iterator.
	First() bool

	// NextTo moves the iterator to the next element from current position that satisfies the condition given by the
	// passed function, and returns true if there was a next element in the container.
	// If NextTo() returns true, then next element's key and value can be retrieved by Key() and Value().
	// Modifies the state of the iterator.
	NextTo(func(key interface{}, value interface{}) bool) bool
}

IteratorWithKey is a stateful iterator for ordered containers whose elements are key value pairs.

type JSONDeserializer added in v1.9.0

type JSONDeserializer interface {
	// FromJSON populates containers's elements from the input JSON representation.
	FromJSON([]byte) error
	// UnmarshalJSON @implements json.Unmarshaler
	UnmarshalJSON([]byte) error
}

JSONDeserializer provides JSON deserialization

type JSONSerializer added in v1.9.0

type JSONSerializer interface {
	// ToJSON outputs the JSON representation of containers's elements.
	ToJSON() ([]byte, error)
	// MarshalJSON @implements json.Marshaler
	MarshalJSON() ([]byte, error)
}

JSONSerializer provides JSON serialization

type ReverseIteratorWithIndex added in v1.1.0

type ReverseIteratorWithIndex interface {
	// Prev moves the iterator to the previous element and returns true if there was a previous element in the container.
	// If Prev() returns true, then previous element's index and value can be retrieved by Index() and Value().
	// Modifies the state of the iterator.
	Prev() bool

	// End moves the iterator past the last element (one-past-the-end).
	// Call Prev() to fetch the last element if any.
	End()

	// Last moves the iterator to the last element and returns true if there was a last element in the container.
	// If Last() returns true, then last element's index and value can be retrieved by Index() and Value().
	// Modifies the state of the iterator.
	Last() bool

	// PrevTo moves the iterator to the previous element from current position that satisfies the condition given by the
	// passed function, and returns true if there was a next element in the container.
	// If PrevTo() returns true, then next element's index and value can be retrieved by Index() and Value().
	// Modifies the state of the iterator.
	PrevTo(func(index int, value interface{}) bool) bool

	IteratorWithIndex
}

ReverseIteratorWithIndex is stateful iterator for ordered containers whose values can be fetched by an index.

Essentially it is the same as IteratorWithIndex, but provides additional:

Prev() function to enable traversal in reverse

Last() function to move the iterator to the last element.

End() function to move the iterator past the last element (one-past-the-end).

type ReverseIteratorWithKey added in v1.1.0

type ReverseIteratorWithKey interface {
	// Prev moves the iterator to the previous element and returns true if there was a previous element in the container.
	// If Prev() returns true, then previous element's key and value can be retrieved by Key() and Value().
	// Modifies the state of the iterator.
	Prev() bool

	// End moves the iterator past the last element (one-past-the-end).
	// Call Prev() to fetch the last element if any.
	End()

	// Last moves the iterator to the last element and returns true if there was a last element in the container.
	// If Last() returns true, then last element's key and value can be retrieved by Key() and Value().
	// Modifies the state of the iterator.
	Last() bool

	// PrevTo moves the iterator to the previous element from current position that satisfies the condition given by the
	// passed function, and returns true if there was a next element in the container.
	// If PrevTo() returns true, then next element's key and value can be retrieved by Key() and Value().
	// Modifies the state of the iterator.
	PrevTo(func(key interface{}, value interface{}) bool) bool

	IteratorWithKey
}

ReverseIteratorWithKey is a stateful iterator for ordered containers whose elements are key value pairs.

Essentially it is the same as IteratorWithKey, but provides additional:

Prev() function to enable traversal in reverse

Last() function to move the iterator to the last element.

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