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/*
* Copyright 2008, Unitils.org
*
* 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 org.unitils.util;
import org.unitils.core.UnitilsException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import static org.unitils.util.ReflectionUtils.createInstanceOfType;
/**
* Utilities for working with property files.
*
* @author Tim Ducheyne
* @author Filip Neven
*/
public class PropertyUtils {
/**
* Gets the string value for the property with the given name. If no such property is found or
* the value is empty, an exception will be raised.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The trimmed string value, not null
*/
public static String getString(String propertyName, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
throw new UnitilsException("No value found for property " + propertyName);
}
return value.trim();
}
/**
* Gets the string value for the property with the given name. If no such property is found or
* the value is empty, the given default value is returned.
*
* @param propertyName The name, not null
* @param defaultValue The default value
* @param properties The properties, not null
* @return The trimmed string value, not null
*/
public static String getString(String propertyName, String defaultValue, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
return defaultValue;
}
return value.trim();
}
/**
* Gets the list of comma separated string values for the property with the given name. If no such property is found or
* the value is empty, an empty list is returned. Empty elements (",,") will not be added. A space (", ,") is not
* empty, a "" will be added.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The trimmed string list, empty if none found
*/
public static List getStringList(String propertyName, Properties properties) {
return getStringList(propertyName, properties, false);
}
/**
* Gets the list of comma separated string values for the property with the given name. If no such property is found or
* the value is empty, an empty list is returned if not required, else an exception is raised. Empty elements (",,")
* will not be added. A space (", ,") is not empty, a "" will be added.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @param required If true an exception will be raised when the property is not found or empty
* @return The trimmed string list, empty or exception if none found
*/
public static List getStringList(String propertyName, Properties properties, boolean required) {
String values = properties.getProperty(propertyName);
if (values == null || "".equals(values.trim())) {
if (required) {
throw new UnitilsException("No value found for property " + propertyName);
}
return new ArrayList(0);
}
String[] splitValues = values.split(",");
List result = new ArrayList(splitValues.length);
for (String value : splitValues) {
result.add(value.trim());
}
if (required && result.isEmpty()) {
throw new UnitilsException("No value found for property " + propertyName);
}
return result;
}
/**
* Gets the boolean value for the property with the given name. If no such property is found or
* the value is empty, an exception will be raised.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The boolean value, not null
*/
public static boolean getBoolean(String propertyName, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
throw new UnitilsException("No value found for property " + propertyName);
}
return toBoolean(propertyName, value);
}
/**
* Gets the boolean value for the property with the given name. If no such property is found or
* the value is empty, the given default value is returned.
*
* @param propertyName The name, not null
* @param defaultValue The default value
* @param properties The properties, not null
* @return The boolean value, not null
*/
public static boolean getBoolean(String propertyName, boolean defaultValue, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
return defaultValue;
}
return toBoolean(propertyName, value);
}
private static boolean toBoolean(String propertyName, String value) {
value = value.trim();
if ("true".equalsIgnoreCase(value)) {
return true;
}
if ("false".equalsIgnoreCase(value)) {
return false;
}
throw new UnitilsException("Value " + value + " for property " + propertyName + " is not a boolean.");
}
/**
* Gets the long value for the property with the given name. If no such property is found, the value is empty
* or cannot be converted to a long, an exception will be raised.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The long value, not null
*/
public static long getLong(String propertyName, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
throw new UnitilsException("No value found for property " + propertyName);
}
try {
return Long.valueOf(value.trim());
} catch (NumberFormatException e) {
throw new UnitilsException("Value " + value + " for property " + propertyName + " is not a number.");
}
}
/**
* Gets the long value for the property with the given name. If no such property is found or
* the value is empty, the given default value is returned. If the value cannot be converted to a long,
* an exception will be raised.
*
* @param propertyName The name, not null
* @param defaultValue The default value
* @param properties The properties, not null
* @return The long value, not null
*/
public static long getLong(String propertyName, long defaultValue, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
return defaultValue;
}
try {
return Long.valueOf(value.trim());
} catch (NumberFormatException e) {
throw new UnitilsException("Value " + value + " for property " + propertyName + " is not a number.");
}
}
/**
* Gets the int value for the property with the given name. If no such property is found, the value is empty
* or cannot be converted to a long, an exception will be raised.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The int value, not null
*/
public static int getInt(String propertyName, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
throw new UnitilsException("No value found for property " + propertyName);
}
try {
return Integer.valueOf(value.trim());
} catch (NumberFormatException e) {
throw new UnitilsException("Value " + value + " for property " + propertyName + " is not a number.");
}
}
/**
* Gets the int value for the property with the given name. If no such property is found or
* the value is empty, the given default value is returned. If the value cannot be converted to a long,
* an exception will be raised.
*
* @param propertyName The name, not null
* @param defaultValue The default value
* @param properties The properties, not null
* @return The int value, not null
*/
public static int getInt(String propertyName, int defaultValue, Properties properties) {
String value = properties.getProperty(propertyName);
if (value == null || "".equals(value.trim())) {
return defaultValue;
}
try {
return Integer.valueOf(value.trim());
} catch (NumberFormatException e) {
throw new UnitilsException("Value " + value + " for property " + propertyName + " is not a number.");
}
}
/**
* Checks whether the property with the given name exists in the System or in the given properties.
*
* @param propertyName The property name, not null
* @param properties The properties if not found in System, not null
* @return True if the property exitsts
*/
public static boolean containsProperty(String propertyName, Properties properties) {
return properties.getProperty(propertyName) != null;
}
/**
* Gets an instance of the type specified by the property with the given name. If no such property is found, the
* value is empty or the instance cannot be created, an exception will be raised.
*
* @param propertyName The name, not null
* @param properties The properties, not null
* @return The instance value, not null
*/
@SuppressWarnings({"unchecked"})
public static T getInstance(String propertyName, Properties properties) {
String className = getString(propertyName, properties);
return (T) createInstanceOfType(className, false);
}
/**
* Gets an instance of the type specified by the property with the given name. If no such property is found, the
* value is empty, the given default value is returned. If the instance cannot be created an exception will be raised.
*
* @param propertyName The name, not null
* @param defaultValue The default value
* @param properties The properties, not null
* @return The instance value, not null
*/
@SuppressWarnings({"unchecked"})
public static T getInstance(String propertyName, T defaultValue, Properties properties) {
String className = getString(propertyName, null, properties);
if (className == null) {
return defaultValue;
}
return (T) createInstanceOfType(className, false);
}
}
