001// Copyright 2004, 2005 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.tapestry.services;
016
017import org.apache.hivemind.Location;
018
019/**
020 * @author Howard M. Lewis Ship
021 * @since 4.0
022 */
023public interface InjectedValueProvider
024{
025    /**
026     * Looks up a value in HiveMind using the object reference (as with HiveMind's built-in object
027     * translator). The module will always be the Tapestry module (which means that most service ids
028     * or configurations will have to be fully qualified.
029     * 
030     * @param objectReference
031     *            the reference to the HiveMind object to obtain, with a leading prefix indicating
032     *            type (i.e., "service:", "configuration:", etc.
033     * @param location
034     *            the location of the value, used if an error must be reported.
035     * @return the value
036     */
037
038    public Object obtainValue(String objectReference, Location location);
039}