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   * Copyright 2010-2015, 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
  * or in the "license" file accompanying this file. This file is distributed
  * express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
 package com.amazonaws.auth;
 import java.util.Map;
Signer factory.
 public final class SignerFactory {
     private static final String QUERY_STRING_SIGNER = "QueryStringSignerType";
     private static final String VERSION_THREE_SIGNER = "AWS3SignerType";
     private static final String VERSION_FOUR_SIGNER = "AWS4SignerType";
     private static final String NO_OP_SIGNER = "NoOpSignerType";
     private static final Map<StringClass<? extends Signer>> SIGNERS
         = new ConcurrentHashMap<StringClass<? extends Signer>>();
     static {
         // Register the standard signer types.

Private so you're not tempted to instantiate me.
     private SignerFactory() {

Register an implementation class for the given signer type.

signerType The name of the signer type to register.
signerClass The class implementing the given signature protocol.
     public static void registerSigner(
             final String signerType,
             final Class<? extends SignersignerClass) {
         if (signerType == null) {
             throw new IllegalArgumentException("signerType cannot be null");
         if (signerClass == null) {
             throw new IllegalArgumentException("signerClass cannot be null");

Returns a non-null signer for the specified service and region according to the internal configuration which provides a basic default algorithm used for signer determination.

serviceName The name of the service to talk to.
regionName The name of the region to talk to; not necessarily the region used for signing.
     public static Signer getSigner(String serviceNameString regionName) {
         return lookupAndCreateSigner(serviceNameregionName);

Returns an instance of the given signer type and configures it with the given service name (if applicable).

signerType The type of signer to create.
serviceName The name of the service to configure on the signer.
a non-null signer.
     public static Signer getSignerByTypeAndService(String signerType,
             final String serviceName) {
         return createSigner(signerTypeserviceName);

Internal implementation for looking up and creating a signer by service name and region.
    private static Signer lookupAndCreateSigner(String serviceNameString regionName) {
        InternalConfig config = InternalConfig.Factory.getInternalConfig();
        SignerConfig signerConfig =
        String signerType = signerConfig.getSignerType();
        return createSigner(signerTypeserviceName);

Internal implementation to create a signer by type and service name, and configuring it with the service name if applicable.
    private static Signer createSigner(String signerType,
            final String serviceName) {
        Class<? extends SignersignerClass = .get(signerType);
        if (signerClass == null)
            throw new IllegalArgumentException("unknown signer type: " + signerType);
        Signer signer;
        try {
            signer = signerClass.newInstance();
        } catch (InstantiationException ex) {
            throw new IllegalStateException(
                "Cannot create an instance of " + signerClass.getName(),
        } catch (IllegalAccessException ex) {
            throw new IllegalStateException(
                "Cannot create an instance of " + signerClass.getName(),
        if (signer instanceof ServiceAwareSigner) {
        return signer;
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