Java tutorial
package alien4cloud.paas.cloudify2.rest.external; /******************************************************************************* * Copyright (c) 2011 GigaSpaces Technologies Ltd. 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. ******************************************************************************/ import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; /** * This class offers static methods to evaluate Strings and read from an input * stream. * * @author rafi * @since 2.0.0 */ public final class StringUtils { /** * Private Ctor, to avoid instantiation of this utility class. */ private StringUtils() { } /** * Checks if a given String is not null or empty. * * @param str The String object to evaluate * @return true/false */ public static boolean notEmpty(final String str) { return str != null && !str.isEmpty(); } /** * Returns the content of a given input stream, as a String object. * * @param is the input stream to read. * @return the content of the given input stream * @throws IOException Reporting failure to read from the InputStream */ public static String getStringFromStream(final InputStream is) throws IOException { BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { sb.append(line); } return sb.toString(); } public static Integer safeParseInt(String str) { try { return Integer.valueOf(str); } catch (NumberFormatException e) { return null; } } /** * Checks if the given name contains chars that are invalid for Application or Service name. * * @param name the Application or Service name to validate * @return true if valid, false otherwise */ public static boolean isValidRecipeName(final String name) { char[] invalidChars = new char[] { '{', '}', '[', ']', '(', ')' }; return !org.apache.commons.lang.StringUtils.containsAny(name, invalidChars); } }