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• MatrixParam.java

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/*
 * 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 URI matrix parameter to a resource method parameter, resource class field, or resource class
 * bean property. Values are URL decoded unless this is disabled using the {@link Encoded} annotation. A default value
 * can be specified using the {@link DefaultValue} annotation.
 * 

 * Note that the {@code @MatrixParam} {@link #value() annotation value} refers to a name of a matrix parameter that
 * resides in the last matched path segment of the {@link Path}-annotated Java structure that injects the value of the
 * matrix parameter.
 * 
 * 

 * The type {@code T} of the annotated parameter, field or property must either:
 * 
 * 

 * 
Be a primitive type
 * 
Have a constructor that accepts a single {@code String} argument
 * 
Have a static method named {@code valueOf} or {@code fromString} that accepts a single {@code String} argument
 * (see, for example, {@link Integer#valueOf(String)})
 * 
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.
 * 
Be {@code List}, {@code Set} or {@code SortedSet}, where {@code T} satisfies 2, 3 or 4 above. The
 * resulting collection is read-only.
 * 
 *
 * 

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

 * Because injection occurs at object creation time, use of this annotation on resource class fields and bean properties
 * is only supported for the default per-request resource class lifecycle. Resource classes using other lifecycles
 * should only use this annotation on resource method parameters.
 * 
 *
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see DefaultValue
 * @see Encoded
 * @see Matrix URIs
 * @since 1.0
 */
@Target({ ElementType.PARAMETER, ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface MatrixParam {

    /**
     * Defines the name of the URI matrix parameter whose value will be used to initialize the value of the annotated method
     * argument, class field or bean property. 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".
     *
     * @return URI matrix parameter name.
     */
    String value();
}