/*
* Copyright 2002-2007 the original author or authors.
*
* 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.springframework.test.annotation;
import org.springframework.util.Assert;
/**
* Implementation of {@link ProfileValueSource} which uses system properties as
* the underlying source.
*
* @author Rod Johnson
* @author Sam Brannen
* @since 2.0
*/
public class SystemProfileValueSource implements ProfileValueSource {
private static final SystemProfileValueSource INSTANCE = new SystemProfileValueSource();
/**
* Obtain the canonical instance of this ProfileValueSource.
*/
public static final SystemProfileValueSource getInstance() {
return INSTANCE;
}
/**
* Private constructor, enforcing the singleton pattern.
*/
private SystemProfileValueSource() {
}
/**
* Get the <em>profile value</em> indicated by the specified key from the
* system properties.
* @see System#getProperty(String)
*/
public String get(String key) {
Assert.hasText(key, "'key' must not be empty");
return System.getProperty(key);
}
}