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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2011-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package com.amazonaws.transform;

import java.lang.reflect.Constructor;

import com.amazonaws.AmazonServiceException;

public abstract class AbstractErrorUnmarshaller implements Unmarshaller {

    /**
     * The type of AmazonServiceException that will be instantiated. Subclasses
     * specialized for a specific type of exception can control this through the
     * protected constructor.
     */
    protected final Class exceptionClass;

    /**
     * Constructs a new error unmarshaller that will unmarshall error responses
     * into AmazonServiceException objects.
     */
    public AbstractErrorUnmarshaller() {
        this(AmazonServiceException.class);
    }

    /**
     * Constructs a new error unmarshaller that will unmarshall error responses
     * into objects of the specified class, extending AmazonServiceException.
     * 
     * @param exceptionClass
     *            The subclass of AmazonServiceException which will be
     *            instantiated and populated by this class.
     */
    public AbstractErrorUnmarshaller(Class exceptionClass) {
        this.exceptionClass = exceptionClass;
    }

    /**
     * Constructs a new exception object of the type specified in this class's
     * constructor and sets the specified error message.
     * 
     * @param message
     *            The error message to set in the new exception object.
     * 
     * @return A new exception object of the type specified in this class's
     *         constructor and sets the specified error message.
     * 
     * @throws Exception
     *             If there are any problems using reflection to invoke the
     *             exception class's constructor.
     */
    protected AmazonServiceException newException(String message) throws Exception {
        Constructor constructor = exceptionClass.getConstructor(String.class);
        return constructor.newInstance(message);
    }

}