import { Http } from '@angular/http';
import { MdError } from '@angular2-material/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/forkJoin';
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/filter';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/share';
import 'rxjs/add/operator/finally';
import 'rxjs/add/operator/catch';
/** Exception thrown when attempting to load an icon with a name that cannot be found. */
export declare class MdIconNameNotFoundError extends MdError {
    constructor(iconName: string);
}
/**
 * Exception thrown when attempting to load SVG content that does not contain the expected
 * <svg> tag.
 */
export declare class MdIconSvgTagNotFoundError extends MdError {
    constructor();
}
/**
 * Service to register and display icons used by the <md-icon> component.
 * - Registers icon URLs by namespace and name.
 * - Registers icon set URLs by namespace.
 * - Registers aliases for CSS classes, for use with icon fonts.
 * - Loads icons from URLs and extracts individual icons from icon sets.
 */
export declare class MdIconRegistry {
    private _http;
    /**
     * URLs and cached SVG elements for individual icons. Keys are of the format "[namespace]:[icon]".
     */
    private _svgIconConfigs;
    /**
     * SvgIconConfig objects and cached SVG elements for icon sets, keyed by namespace.
     * Multiple icon sets can be registered under the same namespace.
     */
    private _iconSetConfigs;
    /** Cache for icons loaded by direct URLs. */
    private _cachedIconsByUrl;
    /** In-progress icon fetches. Used to coalesce multiple requests to the same URL. */
    private _inProgressUrlFetches;
    /** Map from font identifiers to their CSS class names. Used for icon fonts. */
    private _fontCssClassesByAlias;
    /**
     * The CSS class to apply when an <md-icon> component has no icon name, url, or font specified.
     * The default 'material-icons' value assumes that the material icon font has been loaded as
     * described at http://google.github.io/material-design-icons/#icon-font-for-the-web
     */
    private _defaultFontSetClass;
    constructor(_http: Http);
    /** Registers an icon by URL in the default namespace. */
    addSvgIcon(iconName: string, url: string): this;
    /** Registers an icon by URL in the specified namespace. */
    addSvgIconInNamespace(namespace: string, iconName: string, url: string): this;
    /** Registers an icon set by URL in the default namespace. */
    addSvgIconSet(url: string): this;
    /** Registers an icon set by URL in the specified namespace. */
    addSvgIconSetInNamespace(namespace: string, url: string): this;
    /**
     * Defines an alias for a CSS class name to be used for icon fonts. Creating an mdIcon
     * component with the alias as the fontSet input will cause the class name to be applied
     * to the <md-icon> element.
     */
    registerFontClassAlias(alias: string, className?: string): this;
    /**
     * Returns the CSS class name associated with the alias by a previous call to
     * registerFontClassAlias. If no CSS class has been associated, returns the alias unmodified.
     */
    classNameForFontAlias(alias: string): string;
    /**
     * Sets the CSS class name to be used for icon fonts when an <md-icon> component does not
     * have a fontSet input value, and is not loading an icon by name or URL.
     */
    setDefaultFontSetClass(className: string): this;
    /**
     * Returns the CSS class name to be used for icon fonts when an <md-icon> component does not
     * have a fontSet input value, and is not loading an icon by name or URL.
     */
    getDefaultFontSetClass(): string;
    /**
     * Returns an Observable that produces the icon (as an <svg> DOM element) from the given URL.
     * The response from the URL may be cached so this will not always cause an HTTP request, but
     * the produced element will always be a new copy of the originally fetched icon. (That is,
     * it will not contain any modifications made to elements previously returned).
     */
    getSvgIconFromUrl(url: string): Observable<SVGElement>;
    /**
     * Returns an Observable that produces the icon (as an <svg> DOM element) with the given name
     * and namespace. The icon must have been previously registered with addIcon or addIconSet;
     * if not, the Observable will throw an MdIconNameNotFoundError.
     */
    getNamedSvgIcon(name: string, namespace?: string): Observable<SVGElement>;
    /**
     * Returns the cached icon for a SvgIconConfig if available, or fetches it from its URL if not.
     */
    private _getSvgFromConfig(config);
    /**
     * Attempts to find an icon with the specified name in any of the SVG icon sets.
     * First searches the available cached icons for a nested element with a matching name, and
     * if found copies the element to a new <svg> element. If not found, fetches all icon sets
     * that have not been cached, and searches again after all fetches are completed.
     * The returned Observable produces the SVG element if possible, and throws
     * MdIconNameNotFoundError if no icon with the specified name can be found.
     */
    private _getSvgFromIconSetConfigs(name, iconSetConfigs);
    /**
     * Searches the cached SVG elements for the given icon sets for a nested icon element whose "id"
     * tag matches the specified name. If found, copies the nested element to a new SVG element and
     * returns it. Returns null if no matching element is found.
     */
    private _extractIconWithNameFromAnySet(iconName, iconSetConfigs);
    /**
     * Loads the content of the icon URL specified in the SvgIconConfig and creates an SVG element
     * from it.
     */
    private _loadSvgIconFromConfig(config);
    /**
     * Loads the content of the icon set URL specified in the SvgIconConfig and creates an SVG element
     * from it.
     */
    private _loadSvgIconSetFromConfig(config);
    /**
     * Creates a DOM element from the given SVG string, and adds default attributes.
     */
    private _createSvgElementForSingleIcon(responseText, config);
    /**
     * Searches the cached element of the given SvgIconConfig for a nested icon element whose "id"
     * tag matches the specified name. If found, copies the nested element to a new SVG element and
     * returns it. Returns null if no matching element is found.
     */
    private _extractSvgIconFromSet(iconSet, iconName, config);
    /**
     * Creates a DOM element from the given SVG string.
     */
    private _svgElementFromString(str);
    /**
     * Sets the default attributes for an SVG element to be used as an icon.
     */
    private _setSvgAttributes(svg, config);
    /**
     * Returns an Observable which produces the string contents of the given URL. Results may be
     * cached, so future calls with the same URL may not cause another HTTP request.
     */
    private _fetchUrl(url);
}