01: // Copyright 2006 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry.ioc.services;
16:
17: /** A provider of values for symbols. */
18: public interface SymbolProvider {
19: /**
20: * Returns the value for the symbol, or null if this provider can not provide a value. The value
21: * itself may contain symbols that will be recursively expanded.
22: *
23: * @param symbolName
24: * @return the value or null
25: */
26: String valueForSymbol(String symbolName);
27: }
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