Source Code Cross Referenced for Parameter.java in  » Library » Tapestry » org » apache » tapestry » annotations » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.annotations 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright 2006, 2007 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.annotations;
16:
17:        import static java.lang.annotation.ElementType.FIELD;
18:        import static java.lang.annotation.RetentionPolicy.RUNTIME;
19:
20:        import java.lang.annotation.Documented;
21:        import java.lang.annotation.Retention;
22:        import java.lang.annotation.Target;
23:
24:        import org.apache.tapestry.TapestryConstants;
25:        import org.apache.tapestry.services.BindingFactory;
26:
27:        /**
28:         * Annotation placed on a field to indicate that it is, in fact, an parameter. Parameters may be
29:         * optional or required. Required parameters must be bound.
30:         */
31:        @Target(FIELD)
32:        @Documented
33:        @Retention(RUNTIME)
34:        public @interface Parameter {
35:
36:            /**
37:             * The name of the parameter. If not specified, the name of the parameter is derived from the
38:             * name of the field (after stripping off leading punctuation) from the field name.
39:             */
40:            String name() default "";
41:
42:            /**
43:             * If true, the parameter is required and and must be bound. If false (the default), then the
44:             * parameter is optional.
45:             */
46:            boolean required() default false;
47:
48:            /**
49:             * If true (the default), then the value for the parameter is cached while the component is,
50:             * itself, rendering. Values from invariant bindings (such as literal strings) are always
51:             * cached, regardless of this setting. Set this attribute to false to force the parameter to be
52:             * {@link org.apache.tapestry.Binding#get() re-read} every time the field is accessed, even
53:             * while the component is rendering.
54:             */
55:            boolean cache() default true;
56:
57:            /**
58:             * The default value for the parameter if not bound (at not the empty string). This is a binding
59:             * expression, typically the name of a property of the component to bind.
60:             */
61:            String value() default "";
62:
63:            /**
64:             * The default binding prefix for the parameter, if no specific binding prefix is provided with
65:             * the binding. There is <em>rarely</em> a reason to override this. Typically, non-standard
66:             * default binding prefixes are paired with specific {@link BindingFactory} implementations, and
67:             * used with parameters whose name reflects the binding prefix.
68:             */
69:            String defaultPrefix() default TapestryConstants.PROP_BINDING_PREFIX;
70:
71:            /**
72:             * Used to mark a parameter as requiring earlier initialization than other parameters. This is
73:             * used when default bindings for secondary parameters rely on a principal parameter, which
74:             * itself may have a default value. This ensures that the binding for the principal parameter(s)
75:             * are initialized, possibly involving a defaulter method, before the secondary parameters are
76:             * initialized (as they may need to know if the principal parameter is bound, and what type of
77:             * value it is bound to). This is rarely used, and it is highly unlikely a single component
78:             * would have more than a single principal parameter.
79:             */
80:            boolean principal() default false;
81:        }
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