/*
* This file is part of FTB Launcher.
*
* Copyright © 2012-2014, FTB Launcher Contributors <https://github.com/Slowpoke101/FTBLaunch/>
* FTB Launcher is 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 net.ftb.util;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.Scanner;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import net.ftb.log.Logger;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
public class AppUtils {
/**
* Reads all of the data from the given stream and returns it as a string.
* @param stream the stream to read from.
* @return the data read from the given stream as a string.
*/
public static String readString (InputStream stream) {
Scanner scanner = new Scanner(stream).useDelimiter("\\A");
return scanner.hasNext() ? scanner.next() : "";
}
/**
* Downloads data from the given URL and returns it as a Document
* @param url the URL to fetch
* @return The document
* @throws IOException, SAXException if an error occurs when reading from the stream
*/
public static Document downloadXML (URL url) throws IOException, SAXException {
return getXML(url.openStream());
}
/**
* Reads XML from a stream
* @param stream the stream to read the document from
* @return The document
* @throws IOException, SAXException if an error occurs when reading from the stream
*/
public static Document getXML (InputStream stream) throws IOException, SAXException {
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
try {
return docFactory.newDocumentBuilder().parse(stream);
} catch (ParserConfigurationException ignored) {
Logger.logError(ignored.getMessage(), ignored);
} catch (UnknownHostException e) {
Logger.logError(e.getMessage(), e);
}
return null;
}
/**
* Simple sleep and check locking scheme
* @param b boolean to check, continue when true
*/
public static void waitForLock (boolean b) {
waitForLock(b, null);
}
/**
* Simple sleep and check locking scheme
* @param b boolean to check, continue when true
* @param s String to use as locking reason for log messages
*/
public static void waitForLock (boolean b, String s) {
while (!b) {
try {
Thread.sleep(100);
if (s != null) {
Logger.logInfo("Waiting for " + s);
}
} catch (InterruptedException e) {
}
}
}
}