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HTML based flame graph visualizer
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/**
 * Copyright 2018 Alexey Ragozin
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.gridkit.jvmtool.hflame;

import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;

public class XmlUtil {

    public static Document newDocument() {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            return dbf.newDocumentBuilder().newDocument();
        } catch (ParserConfigurationException e) {
            throw new RuntimeException(e);
        }
    }

    public static Document parseFromResource(String path) throws FileNotFoundException {
        InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(path);
        if (is == null) {
            throw new FileNotFoundException("Unable locate resource: " + path);
        }
        InputStreamReader reader = new InputStreamReader(is, Charset.forName("UTF8"));
        return parse(reader);
    }

    public static Document parse(Reader reader) {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            return db.parse(new InputSource(reader));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static List elementsOf(Element el) {
        List r = new ArrayList();
        NodeList nl = el.getChildNodes();
        for(int i = 0; i != nl.getLength(); ++i) {
            Node n = nl.item(i);
            if (n instanceof Element) {
                r.add((Element)n);
            }
        }
        return r;
    }

    public static List textOf(Element el) {
        List r = new ArrayList();
        NodeList nl = el.getChildNodes();
        for(int i = 0; i != nl.getLength(); ++i) {
            Node n = nl.item(i);
            if (n instanceof Text) {
                r.add((Text)n);
            }
        }
        return r;
    }

    public static String id(Element el) {
        return attr(el, "id");
    }

    public static String href(Element el) {
        return attr(el, "src", "href");
    }

    public static boolean isStyleSheet(Element el) {
        if (el.getNodeName().equalsIgnoreCase("link")) {
            return "stylesheet".equalsIgnoreCase(attr(el, "rel"));
        }
        else if (el.getNodeName().equalsIgnoreCase("style")) {
            return true;
        }
        return false;
    }

    public static boolean isScript(Element el) {
        return el.getNodeName().equalsIgnoreCase("script");
    }

    public static String attr(Element el, String... attr) {
        NamedNodeMap nnm = el.getAttributes();
        for(int i = 0; i != nnm.getLength(); ++i) {
            Node node = nnm.item(i);
            if (node instanceof Attr) {
                Attr a = (Attr) node;
                for(String at: attr) {
                    if (a.getName().equalsIgnoreCase(at)) {
                        return a.getValue();
                    }
                }
            }
         }
        return null;
    }
}