Java examples for java.util:Properties File
Get a property value as an Integer.
/*// w ww . ja v a 2 s .co m * 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. */ import java.util.Iterator; import java.util.Map; import java.util.Properties; import java.util.StringTokenizer; public class Main{ /** * Get a property value as an Integer. * <p/> * First, the string value is extracted, and then * {@link Integer#valueOf(String)} is used to determine the correct boolean * value for any non-null property values. * * @see #extractPropertyValue(String, java.util.Properties) * * @param propertyName * The name of the property for which to retrieve value * @param properties * The properties object * @return The property value; may be null. */ public static Integer getInteger(String propertyName, Properties properties) { String value = extractPropertyValue(propertyName, properties); return value == null ? null : Integer.parseInt(value); } /** * Extract a property value by name from the given properties object. * <p/> * Both <tt>null</tt> and <tt>empty string</tt> are viewed as the same, and * return null. * * @param propertyName * The name of the property for which to extract value * @param properties * The properties object * @return The property value; may be null. */ public static String extractPropertyValue(String propertyName, Properties properties) { String value = properties.getProperty(propertyName); if (value == null) { return null; } value = value.trim(); if (StringHelper.isEmpty(value)) { return null; } return value; } }