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package org.glassfish.jersey.spi;

import javax.ws.rs.ext.ExceptionMapper;

/**
 * Provides lookup of {@link ExceptionMapper} instances that can be used
 * to map exceptions to responses.
 *
 * @author Paul Sandoz
 */
public interface ExceptionMappers {

    /**
     * Get an exception mapping provider for a particular class of exception.
     * Returns the provider whose generic type is the nearest superclass of
     * {@code type}.
     *
     * @param  type of the exception handled by the exception mapping provider.
     * @param type the class of exception.
     * @return an {@link ExceptionMapper} for the supplied type or {@code null}
     *     if none is found.
     */
    public  ExceptionMapper find(Class type);

    /**
     * Get an exception mapping provider for a particular exception instance.
     * 

* This method is similar to method {@link #find(Class)}. In addition it takes * into an account the result of the {@link ExtendedExceptionMapper#isMappable(Throwable)} * of any mapper that implements Jersey {@link ExtendedExceptionMapper} API. * If an extended exception mapper returns {@code false} from {@code isMappable(Throwable)}, * the mapper is disregarded from the search. * Exception mapping providers are checked one by one until a first provider returns * {@code true} from the {@code isMappable(Throwable)} method or until a first provider * is found which best supports the exception type and does not implement {@code ExtendedExceptionMapper} * API (i.e. it is a standard JAX-RS {@link ExceptionMapper}). The order in which the providers are * checked is determined by the distance of the declared exception mapper type and the actual exception * type. *

*

* Note that if an exception mapping provider does not implement {@link ExtendedExceptionMapper} * it is always considered applicable for a given exception instance. *

* * @param exceptionInstance exception to be handled by the exception mapping provider. * @param type of the exception handled by the exception mapping provider. * @return an {@link ExceptionMapper} for the supplied exception instance type or {@code null} if none * is found. */ public ExceptionMapper findMapping(T exceptionInstance); }




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