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The AWS SDK for Java - Core module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.
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/*
 * Copyright 2015-2024 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.handlers;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.client.builder.AdvancedConfig;
import com.amazonaws.endpoints.AccountIdEndpointMode;
import com.amazonaws.Protocol;

import java.net.URI;

/**
 * A type safe key used for setting and retrieving context in a {@link
 * com.amazonaws.Request} object.
 *
 *  *     final HandlerContextKey METRICS_KEY = new HandlerContextKey("METRICS_KEY");
 *
 *      new RequestHandler2(){
 *
 *          @Override
 *          public void beforeRequest(Request request) {
 *              request.addHandlerContext(METRICS_KEY, AWSRequestMetrics
 *                                                  .Field.HttpRequestTime.name());
 *          }
 *
 *          @Override
 *          public void afterResponse(Request request, Response response) {
 *              String metricsKey = request.getHandlerContext(METRICS_KEY);
 *          }
 *
 *          @Override
 *          public void afterError(Request request, Response response,
 *          Exception e) { }
 *      }
 * 
 */
public class HandlerContextKey {

    /**
     * The key under which the request credentials are set.
     **/
    public static final HandlerContextKey AWS_CREDENTIALS = new HandlerContextKey("AWSCredentials");

    /**
     * The unique account identifier supplied by the credentials provider.
     */
    public static final HandlerContextKey AWS_CREDENTIALS_ACCOUNT_ID = new HandlerContextKey("AWSCredentialsAccountId");

    /**
     * The region used to sign the request.
     */
    public static final HandlerContextKey SIGNING_REGION = new HandlerContextKey("SigningRegion");

    /**
     * The optional service name to sign the request. If present, it will override the service name in the client
     */
    public static final HandlerContextKey SIGNING_NAME = new HandlerContextKey("SIGNING_NAME");

    /**
     * The name of the operation for the request.
     */
    public static final HandlerContextKey OPERATION_NAME = new HandlerContextKey("OperationName");

    /**
     * The unique identifier for a service to which the request is being sent.
     */
    public static final HandlerContextKey SERVICE_ID = new HandlerContextKey("ServiceId");

    /**
     * A boolean value indicating if Content-Length header is required by the operation
     */
    public static final HandlerContextKey REQUIRES_LENGTH = new HandlerContextKey("RequiresLength");

    /**
     * A boolean value indicating if the input of the operation has a streaming member.
     * If an input shape in operation has streaming trait, then it is a streaming op
     */
    public static final HandlerContextKey HAS_STREAMING_INPUT = new HandlerContextKey("HasStreamingInput");

    /**
     * A boolean value indicating if the output of the operation has a streaming member.
     */
    public static final HandlerContextKey HAS_STREAMING_OUTPUT = new HandlerContextKey("HasStreamingOutput");

    /**
     * Advanced client configuration. Contents will be service specific.
     */
    public static final HandlerContextKey ADVANCED_CONFIG = new HandlerContextKey("AdvancedConfig");

    /**
     * A boolean value indicating if an endpoint is overridden or not
     */
    public static final HandlerContextKey ENDPOINT_OVERRIDDEN = new HandlerContextKey("EndpointOverridden");

    /**
     * The AccountIdEndpointMode which enables or disables account ID based endpoint routing for supported operations.
     */
    public static final HandlerContextKey ACCOUNT_ID_ENDPOINT_MODE = 
        new HandlerContextKey("AccountIdEndpointMode");

    /**
     * The endpoint configured on the client.
     */
    public static final HandlerContextKey CLIENT_ENDPOINT = new HandlerContextKey("ClientEndpoint");

    /**
     * The protocol configured on the client.
     */
    public static final HandlerContextKey CLIENT_PROTOCOL = new HandlerContextKey("ClientProtocol");

    private final String name;

    public HandlerContextKey(String name) {
        if (name == null) {
            throw new IllegalArgumentException("Name cannot be null");
        }
        this.name = name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        HandlerContextKey key = (HandlerContextKey) o;

        return name.equals(key.getName());

    }

    public String getName() {
        return name;
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }
}