core/auth/src/main/java/software/amazon/awssdk/auth/credentials/internal/Ec2MetadataConfigProvider.java [193:244]:
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    public static Builder builder() {
        return new Builder();
    }

    private Optional<EndpointMode> configFileEndpointMode() {
        return resolveProfile().flatMap(p -> p.property(ProfileProperty.EC2_METADATA_SERVICE_ENDPOINT_MODE))
                               .map(EndpointMode::fromValue);
    }

    private Optional<String> configFileEndpointOverride() {
        return resolveProfile().flatMap(p -> p.property(ProfileProperty.EC2_METADATA_SERVICE_ENDPOINT));
    }

    private Optional<Profile> resolveProfile() {
        ProfileFile profileFileToUse = resolveProfileFile();
        String profileNameToUse = resolveProfileName();

        return profileFileToUse.profile(profileNameToUse);
    }

    private ProfileFile resolveProfileFile() {
        if (profileFile != null) {
            return profileFile.get();
        }

        return ProfileFile.defaultProfileFile();
    }

    private String resolveProfileName() {
        if (profileName != null) {
            return profileName;
        }

        return ProfileFileSystemSetting.AWS_PROFILE.getStringValueOrThrow();
    }

    public static class Builder {
        private Supplier<ProfileFile> profileFile;
        private String profileName;

        public Builder profileFile(Supplier<ProfileFile> profileFile) {
            this.profileFile = profileFile;
            return this;
        }

        public Builder profileName(String profileName) {
            this.profileName = profileName;
            return this;
        }

        public Ec2MetadataConfigProvider build() {
            return new Ec2MetadataConfigProvider(this);
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core/regions/src/main/java/software/amazon/awssdk/regions/internal/util/Ec2MetadataConfigProvider.java [107:158]:
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    public static Builder builder() {
        return new Builder();
    }

    private Optional<EndpointMode> configFileEndpointMode() {
        return resolveProfile().flatMap(p -> p.property(ProfileProperty.EC2_METADATA_SERVICE_ENDPOINT_MODE))
                .map(EndpointMode::fromValue);
    }

    private Optional<String> configFileEndpointOverride() {
        return resolveProfile().flatMap(p -> p.property(ProfileProperty.EC2_METADATA_SERVICE_ENDPOINT));
    }

    private Optional<Profile> resolveProfile() {
        ProfileFile profileFileToUse = resolveProfileFile();
        String profileNameToUse = resolveProfileName();

        return profileFileToUse.profile(profileNameToUse);
    }

    private ProfileFile resolveProfileFile() {
        if (profileFile != null) {
            return profileFile.get();
        }

        return ProfileFile.defaultProfileFile();
    }

    private String resolveProfileName() {
        if (profileName != null) {
            return profileName;
        }

        return ProfileFileSystemSetting.AWS_PROFILE.getStringValueOrThrow();
    }

    public static class Builder {
        private Supplier<ProfileFile> profileFile;
        private String profileName;

        public Builder profileFile(Supplier<ProfileFile> profileFile) {
            this.profileFile = profileFile;
            return this;
        }

        public Builder profileName(String profileName) {
            this.profileName = profileName;
            return this;
        }

        public Ec2MetadataConfigProvider build() {
            return new Ec2MetadataConfigProvider(this);
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