| // *************************************************************************************************************************** |
| // * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * |
| // * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * |
| // * to you 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.apache.juneau.internal; |
| |
| /** |
| * System utilities. |
| */ |
| public class SystemUtils { |
| |
| /** |
| * Returns the first non-<jk>null</jk> system property. |
| * |
| * @param def |
| * The default value if none are found. |
| * Can be <jk>null</jk>. |
| * @param keys |
| * The system properties to look for. |
| * @return |
| * The first non-<jk>null</jk> system property, or the default value if non were found. |
| */ |
| public static String getFirstString(String def, String...keys) { |
| for (String key : keys) { |
| String v = System.getProperty(key); |
| if (v != null) |
| return v; |
| } |
| return def; |
| } |
| |
| /** |
| * Returns the first non-<jk>null</jk> boolean system property. |
| * |
| * @param def |
| * The default value if none are found. |
| * Can be <jk>null</jk>. |
| * @param keys |
| * The system properties to look for. |
| * @return |
| * The first non-<jk>null</jk> system property, or the default value if non were found. |
| */ |
| public static Boolean getFirstBoolean(Boolean def, String...keys) { |
| String s = getFirstString(null, keys); |
| return s == null ? def : Boolean.parseBoolean(s); |
| } |
| |
| /** |
| * Returns the first non-<jk>null</jk> integer system property. |
| * |
| * @param def |
| * The default value if none are found. |
| * Can be <jk>null</jk>. |
| * @param keys |
| * The system properties to look for. |
| * @return |
| * The first non-<jk>null</jk> system property, or the default value if non were found. |
| */ |
| public static Integer getFirstInteger(Integer def, String...keys) { |
| String s = getFirstString(null, keys); |
| return s == null ? def : Integer.parseInt(s); |
| } |
| |
| /** |
| * Convenience method for setting a system property value. |
| * |
| * @param key The system property key. |
| * @param value The system property value. |
| * @param overwrite Overwrite the previous value if it exists. |
| */ |
| public static void setProperty(String key, Object value, boolean overwrite) { |
| if (value != null) { |
| if (System.getProperty(key) == null || overwrite) |
| System.setProperty(key, StringUtils.stringify(value)); |
| } |
| } |
| |
| /** |
| * Convenience method for setting a system property value. |
| * |
| * @param key The system property key. |
| * @param value The system property value. |
| */ |
| public static void setProperty(String key, Object value) { |
| setProperty(key, value, true); |
| } |
| } |