src/jsr311-api/src/javax/ws/rs/FormParam.java

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/*
 * FormParam.java
 *
 * Created on November 16, 2006, 2:04 PM
 *
 */

package javax.ws.rs;

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 {@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</code> of the annotated parameter must either:
 * <ol>
 * <li>Be a primitive type</li>
 * <li>Have a constructor that accepts a single <code>String</code> argument</li>
 * <li>Have a static method named <code>valueOf</code> or <code>fromString</code>
 * that accepts a single 
 * <code>String</code> argument (see, for example, {@link Integer#valueOf(String)})</li>
 * <li>Be <code>List&lt;T&gt;</code>, <code>Set&lt;T&gt;</code> or 
 * <code>SortedSet&lt;T&gt;</code>, where <code>T</code> satisfies 2 or 3 above.
 * The resulting collection is read-only.</li>
 * </ol>
 * 
 * <p>If the type is not one of those listed in 4 above then the first value 
 * (lexically) of the parameter is used.</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>
 *
 * @see DefaultValue
 * @see Encoded
 */
@Target({ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
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", 
     * <i>not</i> "a+b" or "a%20b".
     */
    String value();
}