https://github.com/eclipse-ee4j/jaxrs-api: Jakarta RESTful Web Services (Eclipse Foundation) 
/*
 * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.ws.rs;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


Binds the value(s) of a form parameter contained within a request entity body to a resource method parameter. Values are URL decoded unless this is disabled using the Encoded annotation. A default value can be specified using the DefaultValue annotation. If the request entity body is absent or is an unsupported media type, the default value is used. The type T of the annotated parameter must either: 
    

  1. Be a primitive type
    2. 

  2. Have a constructor that accepts a single String argument
    3. 

  3. Have a static method named valueOf or fromString that accepts a single String argument (see, for example, Integer.valueOf(String))
    4. 

  4. Have a registered implementation of ParamConverterProvider JAX-RS extension SPI that returns a ParamConverter instance capable of a "from string" conversion for the type.
    5. 

  5. Be List<T>, Set<T> or SortedSet<T>, where T satisfies 2, 3 or 4 above. The resulting collection is read-only.
    6. 




If the type is not one of the collection types listed in 5 above and the form parameter is represented by multiple
values then the first value (lexically) of the parameter is used.



 If this annotation is used to bind form parameters, a JAX-RS implementation MUST use the entity provider API to create a Form and derive the values from this instance. If there is at least one FormParam for a resource method, JAX-RS implementations MUST support a Form entity parameter for the same method. Support for other entity parameter types is OPTIONAL. 



Note that, whilst the annotation target permits use on fields and methods, this annotation is only required to be
supported on resource method parameters.



Author:Paul Sandoz, Marc Hadley
See Also:
Since:1.0
/**
 * Binds the value(s) of a form parameter contained within a request entity body to a resource method parameter. Values
 * are URL decoded unless this is disabled using the {@link Encoded} annotation. A default value can be specified using
 * the {@link DefaultValue} annotation. If the request entity body is absent or is an unsupported media type, the
 * default value is used.
 *
 * The type {@code T} of the annotated parameter must either:
 * <ol>
 * <li>Be a primitive type</li>
 * <li>Have a constructor that accepts a single {@code String} argument</li>
 * <li>Have a static method named {@code valueOf} or {@code fromString} that accepts a single {@code String} argument
 * (see, for example, {@link Integer#valueOf(String)})</li>
 * <li>Have a registered implementation of {@link jakarta.ws.rs.ext.ParamConverterProvider} JAX-RS extension SPI that
 * returns a {@link jakarta.ws.rs.ext.ParamConverter} instance capable of a "from string" conversion for the type.</li>
 * <li>Be {@code List<T>}, {@code Set<T>} or {@code SortedSet<T>}, where {@code T} satisfies 2, 3 or 4 above. The
 * resulting collection is read-only.</li>
 * </ol>
 *
 * <p>
 * If the type is not one of the collection types listed in 5 above and the form parameter is represented by multiple
 * values then the first value (lexically) of the parameter is used.
 * </p>
 *
 * <p>
 * If this annotation is used to bind form parameters, a JAX-RS implementation MUST use the entity provider API
 * to create a {@link jakarta.ws.rs.core.Form} and derive the values from this instance. If there is at least one
 * {@link FormParam} for a resource method, JAX-RS implementations MUST support a {@link jakarta.ws.rs.core.Form}
 * entity parameter for the same method. Support for other entity parameter types is OPTIONAL.
 * </p>
 *
 * <p>
 * Note that, whilst the annotation target permits use on fields and methods, this annotation is only required to be
 * supported on resource method parameters.
 * </p>
 *
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see DefaultValue
 * @see Encoded
 * @since 1.0
 */
@Target({ ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FormParam {

    
Defines the name of the form parameter whose value will be used to initialize the value of the annotated method
argument. The name is specified in decoded form, any percent encoded literals within the value will not be decoded
and will instead be treated as literal text. E.g. if the parameter name is "a b" then the value of the annotation is
"a b", not "a+b" or "a%20b".

Returns:form parameter name.
/**
     * Defines the name of the form parameter whose value will be used to initialize the value of the annotated method
     * argument. The name is specified in decoded form, any percent encoded literals within the value will not be decoded
     * and will instead be treated as literal text. E.g. if the parameter name is "a b" then the value of the annotation is
     * "a b", <i>not</i> "a+b" or "a%20b".
     *
     * @return form parameter name.
     */
    String value();
}