/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Subject } from 'rxjs';
/**
 * Class to be used to power selecting one or more options from a list.
 */
export class SelectionModel {
    /** Selected values. */
    get selected() {
        if (!this._selected) {
            this._selected = Array.from(this._selection.values());
        }
        return this._selected;
    }
    constructor(_multiple = false, initiallySelectedValues, _emitChanges = true, compareWith) {
        this._multiple = _multiple;
        this._emitChanges = _emitChanges;
        this.compareWith = compareWith;
        /** Currently-selected values. */
        this._selection = new Set();
        /** Keeps track of the deselected options that haven't been emitted by the change event. */
        this._deselectedToEmit = [];
        /** Keeps track of the selected options that haven't been emitted by the change event. */
        this._selectedToEmit = [];
        /** Event emitted when the value has changed. */
        this.changed = new Subject();
        if (initiallySelectedValues && initiallySelectedValues.length) {
            if (_multiple) {
                initiallySelectedValues.forEach(value => this._markSelected(value));
            }
            else {
                this._markSelected(initiallySelectedValues[0]);
            }
            // Clear the array in order to avoid firing the change event for preselected values.
            this._selectedToEmit.length = 0;
        }
    }
    /**
     * Selects a value or an array of values.
     * @param values The values to select
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    select(...values) {
        this._verifyValueAssignment(values);
        values.forEach(value => this._markSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Deselects a value or an array of values.
     * @param values The values to deselect
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    deselect(...values) {
        this._verifyValueAssignment(values);
        values.forEach(value => this._unmarkSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Sets the selected values
     * @param values The new selected values
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    setSelection(...values) {
        this._verifyValueAssignment(values);
        const oldValues = this.selected;
        const newSelectedSet = new Set(values);
        values.forEach(value => this._markSelected(value));
        oldValues
            .filter(value => !newSelectedSet.has(value))
            .forEach(value => this._unmarkSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Toggles a value between selected and deselected.
     * @param value The value to toggle
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    toggle(value) {
        return this.isSelected(value) ? this.deselect(value) : this.select(value);
    }
    /**
     * Clears all of the selected values.
     * @param flushEvent Whether to flush the changes in an event.
     *   If false, the changes to the selection will be flushed along with the next event.
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    clear(flushEvent = true) {
        this._unmarkAll();
        const changed = this._hasQueuedChanges();
        if (flushEvent) {
            this._emitChangeEvent();
        }
        return changed;
    }
    /**
     * Determines whether a value is selected.
     */
    isSelected(value) {
        return this._selection.has(this._getConcreteValue(value));
    }
    /**
     * Determines whether the model does not have a value.
     */
    isEmpty() {
        return this._selection.size === 0;
    }
    /**
     * Determines whether the model has a value.
     */
    hasValue() {
        return !this.isEmpty();
    }
    /**
     * Sorts the selected values based on a predicate function.
     */
    sort(predicate) {
        if (this._multiple && this.selected) {
            this._selected.sort(predicate);
        }
    }
    /**
     * Gets whether multiple values can be selected.
     */
    isMultipleSelection() {
        return this._multiple;
    }
    /** Emits a change event and clears the records of selected and deselected values. */
    _emitChangeEvent() {
        // Clear the selected values so they can be re-cached.
        this._selected = null;
        if (this._selectedToEmit.length || this._deselectedToEmit.length) {
            this.changed.next({
                source: this,
                added: this._selectedToEmit,
                removed: this._deselectedToEmit,
            });
            this._deselectedToEmit = [];
            this._selectedToEmit = [];
        }
    }
    /** Selects a value. */
    _markSelected(value) {
        value = this._getConcreteValue(value);
        if (!this.isSelected(value)) {
            if (!this._multiple) {
                this._unmarkAll();
            }
            if (!this.isSelected(value)) {
                this._selection.add(value);
            }
            if (this._emitChanges) {
                this._selectedToEmit.push(value);
            }
        }
    }
    /** Deselects a value. */
    _unmarkSelected(value) {
        value = this._getConcreteValue(value);
        if (this.isSelected(value)) {
            this._selection.delete(value);
            if (this._emitChanges) {
                this._deselectedToEmit.push(value);
            }
        }
    }
    /** Clears out the selected values. */
    _unmarkAll() {
        if (!this.isEmpty()) {
            this._selection.forEach(value => this._unmarkSelected(value));
        }
    }
    /**
     * Verifies the value assignment and throws an error if the specified value array is
     * including multiple values while the selection model is not supporting multiple values.
     */
    _verifyValueAssignment(values) {
        if (values.length > 1 && !this._multiple && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getMultipleValuesInSingleSelectionError();
        }
    }
    /** Whether there are queued up change to be emitted. */
    _hasQueuedChanges() {
        return !!(this._deselectedToEmit.length || this._selectedToEmit.length);
    }
    /** Returns a value that is comparable to inputValue by applying compareWith function, returns the same inputValue otherwise. */
    _getConcreteValue(inputValue) {
        if (!this.compareWith) {
            return inputValue;
        }
        else {
            for (let selectedValue of this._selection) {
                if (this.compareWith(inputValue, selectedValue)) {
                    return selectedValue;
                }
            }
            return inputValue;
        }
    }
}
/**
 * Returns an error that reports that multiple values are passed into a selection model
 * with a single value.
 * @docs-private
 */
export function getMultipleValuesInSingleSelectionError() {
    return Error('Cannot pass multiple values into SelectionModel with single-value mode.');
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Subject} from 'rxjs';\n\n/**\n * Class to be used to power selecting one or more options from a list.\n */\nexport class SelectionModel<T> {\n  /** Currently-selected values. */\n  private _selection = new Set<T>();\n\n  /** Keeps track of the deselected options that haven't been emitted by the change event. */\n  private _deselectedToEmit: T[] = [];\n\n  /** Keeps track of the selected options that haven't been emitted by the change event. */\n  private _selectedToEmit: T[] = [];\n\n  /** Cache for the array value of the selected items. */\n  private _selected: T[] | null;\n\n  /** Selected values. */\n  get selected(): T[] {\n    if (!this._selected) {\n      this._selected = Array.from(this._selection.values());\n    }\n\n    return this._selected;\n  }\n\n  /** Event emitted when the value has changed. */\n  readonly changed = new Subject<SelectionChange<T>>();\n\n  constructor(\n    private _multiple = false,\n    initiallySelectedValues?: T[],\n    private _emitChanges = true,\n    public compareWith?: (o1: T, o2: T) => boolean,\n  ) {\n    if (initiallySelectedValues && initiallySelectedValues.length) {\n      if (_multiple) {\n        initiallySelectedValues.forEach(value => this._markSelected(value));\n      } else {\n        this._markSelected(initiallySelectedValues[0]);\n      }\n\n      // Clear the array in order to avoid firing the change event for preselected values.\n      this._selectedToEmit.length = 0;\n    }\n  }\n\n  /**\n   * Selects a value or an array of values.\n   * @param values The values to select\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  select(...values: T[]): boolean | void {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._markSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /**\n   * Deselects a value or an array of values.\n   * @param values The values to deselect\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  deselect(...values: T[]): boolean | void {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /**\n   * Sets the selected values\n   * @param values The new selected values\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  setSelection(...values: T[]): boolean | void {\n    this._verifyValueAssignment(values);\n    const oldValues = this.selected;\n    const newSelectedSet = new Set(values);\n    values.forEach(value => this._markSelected(value));\n    oldValues\n      .filter(value => !newSelectedSet.has(value))\n      .forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /**\n   * Toggles a value between selected and deselected.\n   * @param value The value to toggle\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  toggle(value: T): boolean | void {\n    return this.isSelected(value) ? this.deselect(value) : this.select(value);\n  }\n\n  /**\n   * Clears all of the selected values.\n   * @param flushEvent Whether to flush the changes in an event.\n   *   If false, the changes to the selection will be flushed along with the next event.\n   * @return Whether the selection changed as a result of this call\n   * @breaking-change 16.0.0 make return type boolean\n   */\n  clear(flushEvent = true): boolean | void {\n    this._unmarkAll();\n    const changed = this._hasQueuedChanges();\n    if (flushEvent) {\n      this._emitChangeEvent();\n    }\n    return changed;\n  }\n\n  /**\n   * Determines whether a value is selected.\n   */\n  isSelected(value: T): boolean {\n    return this._selection.has(this._getConcreteValue(value));\n  }\n\n  /**\n   * Determines whether the model does not have a value.\n   */\n  isEmpty(): boolean {\n    return this._selection.size === 0;\n  }\n\n  /**\n   * Determines whether the model has a value.\n   */\n  hasValue(): boolean {\n    return !this.isEmpty();\n  }\n\n  /**\n   * Sorts the selected values based on a predicate function.\n   */\n  sort(predicate?: (a: T, b: T) => number): void {\n    if (this._multiple && this.selected) {\n      this._selected!.sort(predicate);\n    }\n  }\n\n  /**\n   * Gets whether multiple values can be selected.\n   */\n  isMultipleSelection() {\n    return this._multiple;\n  }\n\n  /** Emits a change event and clears the records of selected and deselected values. */\n  private _emitChangeEvent() {\n    // Clear the selected values so they can be re-cached.\n    this._selected = null;\n\n    if (this._selectedToEmit.length || this._deselectedToEmit.length) {\n      this.changed.next({\n        source: this,\n        added: this._selectedToEmit,\n        removed: this._deselectedToEmit,\n      });\n\n      this._deselectedToEmit = [];\n      this._selectedToEmit = [];\n    }\n  }\n\n  /** Selects a value. */\n  private _markSelected(value: T) {\n    value = this._getConcreteValue(value);\n    if (!this.isSelected(value)) {\n      if (!this._multiple) {\n        this._unmarkAll();\n      }\n\n      if (!this.isSelected(value)) {\n        this._selection.add(value);\n      }\n\n      if (this._emitChanges) {\n        this._selectedToEmit.push(value);\n      }\n    }\n  }\n\n  /** Deselects a value. */\n  private _unmarkSelected(value: T) {\n    value = this._getConcreteValue(value);\n    if (this.isSelected(value)) {\n      this._selection.delete(value);\n\n      if (this._emitChanges) {\n        this._deselectedToEmit.push(value);\n      }\n    }\n  }\n\n  /** Clears out the selected values. */\n  private _unmarkAll() {\n    if (!this.isEmpty()) {\n      this._selection.forEach(value => this._unmarkSelected(value));\n    }\n  }\n\n  /**\n   * Verifies the value assignment and throws an error if the specified value array is\n   * including multiple values while the selection model is not supporting multiple values.\n   */\n  private _verifyValueAssignment(values: T[]) {\n    if (values.length > 1 && !this._multiple && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getMultipleValuesInSingleSelectionError();\n    }\n  }\n\n  /** Whether there are queued up change to be emitted. */\n  private _hasQueuedChanges() {\n    return !!(this._deselectedToEmit.length || this._selectedToEmit.length);\n  }\n\n  /** Returns a value that is comparable to inputValue by applying compareWith function, returns the same inputValue otherwise. */\n  private _getConcreteValue(inputValue: T): T {\n    if (!this.compareWith) {\n      return inputValue;\n    } else {\n      for (let selectedValue of this._selection) {\n        if (this.compareWith!(inputValue, selectedValue)) {\n          return selectedValue;\n        }\n      }\n      return inputValue;\n    }\n  }\n}\n\n/**\n * Event emitted when the value of a MatSelectionModel has changed.\n * @docs-private\n */\nexport interface SelectionChange<T> {\n  /** Model that dispatched the event. */\n  source: SelectionModel<T>;\n  /** Options that were added to the model. */\n  added: T[];\n  /** Options that were removed from the model. */\n  removed: T[];\n}\n\n/**\n * Returns an error that reports that multiple values are passed into a selection model\n * with a single value.\n * @docs-private\n */\nexport function getMultipleValuesInSingleSelectionError() {\n  return Error('Cannot pass multiple values into SelectionModel with single-value mode.');\n}\n"]}