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    
015    package org.apache.tapestry5.ioc.annotations;
016    
017    import java.lang.annotation.Documented;
018    import static java.lang.annotation.ElementType.FIELD;
019    import static java.lang.annotation.ElementType.PARAMETER;
020    import java.lang.annotation.Retention;
021    import static java.lang.annotation.RetentionPolicy.RUNTIME;
022    import java.lang.annotation.Target;
023    
024    import 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})
040    public @interface Value
041    {
042        /**
043         * The value to be coerced and injected.
044         */
045        String value();
046    }