001// Copyright 2007, 2008, 2009 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.annotations;
016
017import java.lang.annotation.Documented;
018import static java.lang.annotation.ElementType.FIELD;
019import static java.lang.annotation.ElementType.PARAMETER;
020import java.lang.annotation.Retention;
021import static java.lang.annotation.RetentionPolicy.RUNTIME;
022import java.lang.annotation.Target;
023
024import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.*;
025
026/**
027 * Used in conjunction with {@link org.apache.tapestry5.ioc.annotations.Inject} to inject a literal value, rather than a
028 * service. Symbols in the value are expanded and the resulting string is coerced to the desired type. For IoC, this
029 * annotation is only applied to parameters (on service builder methods, and on service constructors); for components,
030 * it may also be applied to field.
031 *
032 * @see org.apache.tapestry5.ioc.services.SymbolSource
033 * @see org.apache.tapestry5.ioc.services.TypeCoercer
034 */
035@Target(
036        { PARAMETER, FIELD })
037@Retention(RUNTIME)
038@Documented
039@UseWith({COMPONENT,MIXIN,PAGE,SERVICE})
040public @interface Value
041{
042    /**
043     * The value to be coerced and injected.
044     */
045    String value();
046}