001    // Copyright 2007, 2008 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    /**
025     * Used to inject a symbol value, via a symbol name. This is used much like {@link
026     * org.apache.tapestry5.ioc.annotations.Value} annotation, except that symbols are not expanded ... the entire value is
027     * a symbol name. This allows the annotation to reference a public constant variable.
028     */
029    @Target(
030            { PARAMETER, FIELD })
031    @Retention(RUNTIME)
032    @Documented
033    public @interface Symbol
034    {
035        /**
036         * The name of the symbol to inject.
037         */
038        String value();
039    }