/**
 * (c) 2011 Christopher Thatcher
 * (c) 2010 OpenSeadragon
 * (c) 2010 CodePlex Foundation
 *
 * OpenSeadragon @VERSION@
 * ----------------------------------------------------------------------------
 * 
 *  License: New BSD License (BSD)
 *  Copyright (c) 2010, OpenSeadragon
 *  All rights reserved.
 * 
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions are met:
 *  
 *  * Redistributions of source code must retain the above copyright notice, this 
 *    list of conditions and the following disclaimer.
 *  
 *  * Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 * 
 *  * Neither the name of OpenSeadragon nor the names of its contributors may be 
 *    used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 * 
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 *  POSSIBILITY OF SUCH DAMAGE.
 * 
 * ----------------------------------------------------------------------------
 *
 **/

OpenSeadragon = window.OpenSeadragon || (function(){
    
    //Taken from jquery 1.6.1
    // [[Class]] -> type pairs
    var class2type = {
        '[object Boolean]':     'boolean',
        '[object Number]':      'number',
        '[object String]':      'string',
        '[object Function]':    'function',
        '[object Array]':       'array',
        '[object Date]':        'date',
        '[object RegExp]':      'regexp',
        '[object Object]':      'object'
    },
    // Save a reference to some core methods
    toString    = Object.prototype.toString,
    hasOwn      = Object.prototype.hasOwnProperty,
    push        = Array.prototype.push,
    slice       = Array.prototype.slice,
    trim        = String.prototype.trim,
    indexOf     = Array.prototype.indexOf;

    return {
        // See test/unit/core.js for details concerning isFunction.
        // Since version 1.3, DOM methods and functions like alert
        // aren't supported. They return false on IE (#2968).
        isFunction: function( obj ) {
            return OpenSeadragon.type(obj) === "function";
        },

        isArray: Array.isArray || function( obj ) {
            return OpenSeadragon.type(obj) === "array";
        },

        // A crude way of determining if an object is a window
        isWindow: function( obj ) {
            return obj && typeof obj === "object" && "setInterval" in obj;
        },

        type: function( obj ) {
            return obj == null ?
                String( obj ) :
                class2type[ toString.call(obj) ] || "object";
        },

        isPlainObject: function( obj ) {
            // Must be an Object.
            // Because of IE, we also have to check the presence of the constructor property.
            // Make sure that DOM nodes and window objects don't pass through, as well
            if ( !obj || OpenSeadragon.type(obj) !== "object" || obj.nodeType || OpenSeadragon.isWindow( obj ) ) {
                return false;
            }

            // Not own constructor property must be Object
            if ( obj.constructor &&
                !hasOwn.call(obj, "constructor") &&
                !hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
                return false;
            }

            // Own properties are enumerated firstly, so to speed up,
            // if last one is own, then all properties are own.

            var key;
            for ( key in obj ) {}

            return key === undefined || hasOwn.call( obj, key );
        },

        isEmptyObject: function( obj ) {
            for ( var name in obj ) {
                return false;
            }
            return true;
        }

    };

}());

(function( $ ){
    
    $.SIGNAL = "----seadragon----";

    $.delegate = function(object, method) {
        return function() {
            if (arguments === undefined)
                arguments = [];
            return method.apply(object, arguments);
        };
    };

    //Taken from jQuery 1.6.1:
    $.extend = function() {
        var options, name, src, copy, copyIsArray, clone,
            target = arguments[0] || {},
            i = 1,
            length = arguments.length,
            deep = false;

        // Handle a deep copy situation
        if ( typeof target === "boolean" ) {
            deep = target;
            target = arguments[1] || {};
            // skip the boolean and the target
            i = 2;
        }

        // Handle case when target is a string or something (possible in deep copy)
        if ( typeof target !== "object" && !OpenSeadragon.isFunction(target) ) {
            target = {};
        }

        // extend jQuery itself if only one argument is passed
        if ( length === i ) {
            target = this;
            --i;
        }

        for ( ; i < length; i++ ) {
            // Only deal with non-null/undefined values
            if ( (options = arguments[ i ]) != null ) {
                // Extend the base object
                for ( name in options ) {
                    src = target[ name ];
                    copy = options[ name ];

                    // Prevent never-ending loop
                    if ( target === copy ) {
                        continue;
                    }

                    // Recurse if we're merging plain objects or arrays
                    if ( deep && copy && ( OpenSeadragon.isPlainObject(copy) || (copyIsArray = OpenSeadragon.isArray(copy)) ) ) {
                        if ( copyIsArray ) {
                            copyIsArray = false;
                            clone = src && OpenSeadragon.isArray(src) ? src : [];

                        } else {
                            clone = src && OpenSeadragon.isPlainObject(src) ? src : {};
                        }

                        // Never move original objects, clone them
                        target[ name ] = OpenSeadragon.extend( deep, clone, copy );

                    // Don't bring in undefined values
                    } else if ( copy !== undefined ) {
                        target[ name ] = copy;
                    }
                }
            }
        }

        // Return the modified object
        return target;
    };

}( OpenSeadragon ));