    001// Copyright 2006 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.ioc.internal.services;
    016
    017import org.apache.tapestry5.ioc.services.SymbolProvider;
    018
    019/**
    020 * Obtains symbol values from JVM System properties. This implementation is usually ordered first, so that explicit
    021 * overrides, provided as JVM system properties, can take effect.
    022 */
    023public class SystemPropertiesSymbolProvider implements SymbolProvider
    024{
    025    @Override
    026    public String valueForSymbol(String symbolName)
    027    {
    028        return System.getProperty(symbolName);
    029    }
    030}