#// Usage: jjs -scripting cricket.js

/*

 * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle 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.

 */

// Example that demonstrates reading XML Rss feed.

// XML DOM Document element is wrapped by script

// "proxy" (JSAdapter constructor)

// Java classes used

var DocBuilderFac = Java.type("javax.xml.parsers.DocumentBuilderFactory");

var Node = Java.type("org.w3c.dom.Node");

// constants from Node class

var ELEMENT_NODE = Node.ELEMENT_NODE;

var TEXT_NODE = Node.TEXT_NODE;

// parse XML from uri and return Document

function parseXML(uri) {

    var docBuilder = DocBuilderFac.newInstance().newDocumentBuilder();

    return docBuilder["parse(java.lang.String)"](uri);

}

// get child Elements of given name of the parent element given

function getChildElements(elem, name) {

    var nodeList = elem.childNodes;

    var childElems = [];

    var len = nodeList.length;

    for (var i = 0; i < len; i++) {

        var node = nodeList.item(i);

        if (node.nodeType == ELEMENT_NODE &&

            node.tagName == name) {

            childElems.push(wrapElement(node));

        }

    }

    return childElems;

}

// get concatenated child text content of an Element

function getElemText(elem) {

    var nodeList = elem.childNodes;

    var len = nodeList.length;

    var text = '';

    for (var i = 0; i < len; i++) {

        var node = nodeList.item(i);

        if (node.nodeType == TEXT_NODE) {

            text += node.nodeValue;

        }

    }

    return text;

}

// Wrap DOM Element object as a convenient script object

// using JSAdapter. JSAdapter is like java.lang.reflect.Proxy

// in that it allows property access, method calls be trapped

// by 'magic' methods like __get__, __call__.

function wrapElement(elem) {

    if (! elem) {

        return elem;

    }

    return new JSAdapter() {

        // getter to expose child elements and attributes by name

        __get__: function(name) {

            if (typeof name == 'string') {

                if (name.startsWith('@')) {

                    var attr = elem.getAttributeNode(name.substring(1));

                    return !attr? undefined : attr.value;

                }

                var arr = getChildElements(elem, name);

                if (arr.length == 1) {

                    // single child element, expose as single element

                    return arr[0];

                } else {

                    // multiple children of given name, expose as array

                    return arr;

                }

            }

            return undefined;

        },

        __call__: function(name) {

            // toString override to get text content of this Element

            if (name == 'toString' || name == 'valueOf') {

                return getElemText(elem);

            }

            return undefined;

        }

    }

}

function printCricketScore() {

    var doc = parseXML("http://static.cricinfo.com/rss/livescores.xml");

    // wrap document root Element as script convenient object

    var rss = wrapElement(doc.documentElement);

    print("rss file version " + rss['@version']);

    print(rss.channel.title);

    print(rss.channel.description);

    print(rss.channel.pubDate);

    print("=====================");

    var items = rss.channel.item;

    for each (var i in items) {

        print(i.description);

    }

}

printCricketScore();