Java tutorial
/* * Copyright (c) 2014 Magnet Systems, Inc. * All rights reserved. * * 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 com.magnet.plugin.r2m.ui.chooser; import com.intellij.openapi.ui.Messages; import com.magnet.langpack.builder.rest.parser.ExampleParser; import com.magnet.langpack.builder.rest.parser.RestExampleModel; import com.magnet.plugin.r2m.helpers.IOUtils; import com.magnet.plugin.common.Logger; import com.magnet.plugin.r2m.helpers.UIHelper; import com.magnet.plugin.common.helpers.URLHelper; import com.magnet.plugin.r2m.messages.R2MMessages; import com.magnet.plugin.r2m.models.ExampleResource; import com.magnet.plugin.r2m.models.ExamplesManifest; import sun.net.www.protocol.file.FileURLConnection; import java.io.File; import java.io.FileFilter; import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.List; /** * Helper for REST example chooser */ public class ExampleChooserHelper { private static final String MANIFEST_URL = ExampleResource.EXAMPLES_BASE_URL + "manifest.json"; private static ExamplesManifest EXAMPLES_MANIFEST = null; private static volatile boolean EXAMPLES_DIALOG_UP = false; public static synchronized boolean isExamplesDialogUp() { return EXAMPLES_DIALOG_UP; } public static String showExamplesDialog() { EXAMPLES_DIALOG_UP = true; try { List<String> examples = getManifest().getExamplesList(); String response = Messages.showEditableChooseDialog(R2MMessages.getMessage("CHOOSE_EXAMPLE_LABEL"), R2MMessages.getMessage("CHOOSE_EXAMPLE_TITLE"), Messages.getQuestionIcon(), examples.toArray(new String[examples.size()]), R2MMessages.getMessage("CHOOSE_EXAMPLE_DEFAULT_VALUE"), null); return response == null ? null : response.split(ExamplesManifest.DESCRIPTION_SEPARATOR_KEY)[0]; } finally { EXAMPLES_DIALOG_UP = false; } } private static ExamplesManifest getManifest() { if (null != EXAMPLES_MANIFEST) { return EXAMPLES_MANIFEST; } InputStream infoStream = null; try { infoStream = URLHelper.loadUrl(MANIFEST_URL); String json = IOUtils.toString(infoStream); EXAMPLES_MANIFEST = new ExamplesManifest(json); } catch (Exception ex) { UIHelper.showErrorMessage("Couldn't parse manifest at URL: " + MANIFEST_URL); Logger.error(ExampleChooserHelper.class, ex.getMessage()); EXAMPLES_MANIFEST = null; } finally { if (infoStream != null) { try { infoStream.close(); } catch (IOException e1) { // ignore } } } return EXAMPLES_MANIFEST; } public static List<RestExampleModel> getControllersMethodsByName(String name) { String url = getExampleUrlByName(name); if (null == url) { return null; } return getControllersMethodsByUrl(url); } private static String getExampleUrlByName(String name) { ExamplesManifest manifest = getManifest(); ExampleResource example = manifest.getExample(name); if (null == example) { return null; } return example.getUrl(); } public static List<RestExampleModel> getControllersMethodsByUrl(String urlString) { ExampleParser parser = new ExampleParser(); List<RestExampleModel> methodModels = new ArrayList<RestExampleModel>(); try { if (!ping(urlString, 5000)) { UIHelper.showErrorMessage("URL not reachable: " + urlString); return null; } URL url = new URL(urlString); methodModels.addAll(parser.parseExample(url)); } catch (MalformedURLException e) { return null; } return methodModels; } public static List<RestExampleModel> getControllersMethodsByFile(File file) { List<RestExampleModel> methodModels = new ArrayList<RestExampleModel>(); try { if (file.isFile()) { return getControllersMethodsByUrl(file.toURI().toURL().toString()); } if (file.isDirectory()) { File[] files = file.listFiles(new FileFilter() { @Override public boolean accept(File file) { return file.isFile() && !file.getName().startsWith("."); } }); if (files != null && files.length > 0) { for (File f : files) { methodModels.addAll(getControllersMethodsByUrl(f.toURI().toURL().toString())); } } } } catch (MalformedURLException e) { e.printStackTrace(); // should not happen } return methodModels; } /** * Found on http://stackoverflow.com/questions/3584210/preferred-java-way-to-ping-a-http-url-for-availability * Pings a HTTP URL. This effectively sends a HEAD request and returns <code>true</code> if the response code is in * the 200-399 range. * @param url The HTTP URL to be pinged. * @param timeout The timeout in millis for both the connection timeout and the response read timeout. Note that * the total timeout is effectively two times the given timeout. * @return <code>true</code> if the given HTTP URL has returned response code 200-399 on a HEAD request within the * given timeout, otherwise <code>false</code>. */ public static boolean ping(String url, int timeout) { try { URLConnection conn = new URL(url).openConnection(); if (conn instanceof FileURLConnection) { return true; } HttpURLConnection connection = (HttpURLConnection) conn; connection.setConnectTimeout(timeout); connection.setReadTimeout(timeout); connection.setRequestMethod("HEAD"); int responseCode = connection.getResponseCode(); return (200 <= responseCode && responseCode <= 399); } catch (IOException exception) { return false; } } }