本文整理了Java中org.wildfly.security.authz.Attributes.getFirst()方法的一些代码示例，展示了Attributes.getFirst()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Attributes.getFirst()方法的具体详情如下：
包路径：org.wildfly.security.authz.Attributes
类名称：Attributes
方法名：getFirst

Attributes.getFirst介绍

[英]Get the first value mapped to the given key.
[中]获取映射到给定键的第一个值。

代码示例

代码示例来源：origin: wildfly/wildfly

@Override
public Principal getRealmIdentityPrincipal() {
  try {
    if (exists()) {
      if (!this.claims.containsKey(principalClaimName)) {
        throw ElytronMessages.log.tokenRealmFailedToObtainPrincipalWithClaim(principalClaimName);
      }
      return new NamePrincipal(this.claims.getFirst(principalClaimName));
    }
  } catch (Exception e) {
    throw ElytronMessages.log.tokenRealmFailedToObtainPrincipal(e);
  }
  return null;
}

代码示例来源：origin: org.wildfly.security/wildfly-elytron

@Override
public Principal getRealmIdentityPrincipal() {
  try {
    if (exists()) {
      if (!this.claims.containsKey(principalClaimName)) {
        throw ElytronMessages.log.tokenRealmFailedToObtainPrincipalWithClaim(principalClaimName);
      }
      return new NamePrincipal(this.claims.getFirst(principalClaimName));
    }
  } catch (Exception e) {
    throw ElytronMessages.log.tokenRealmFailedToObtainPrincipal(e);
  }
  return null;
}

代码示例来源：origin: org.wildfly.security/wildfly-elytron-realm-token

/**
 * The default implementation of the claimToPrincipal mapping function. Takes the {@linkplain #principalClaimName} claim
 * value and wraps it in a {@linkplain NamePrincipal}.
 * @param claims - token claims
 * @return the NamePrincipal or null on failure to extract claim value
 */
private Principal defaultClaimToPrincipal(Attributes claims) {
  Principal principal = null;
  try {
    if (!claims.containsKey(principalClaimName)) {
      throw ElytronMessages.log.tokenRealmFailedToObtainPrincipalWithClaim(principalClaimName);
    }
    String principalName = claims.getFirst(principalClaimName);
    principal = new NamePrincipal(principalName);
  } catch (Exception e) {
    throw ElytronMessages.log.tokenRealmFailedToObtainPrincipal(e);
  }
  return principal;
}

代码示例来源：origin: org.jboss.eap/wildfly-client-all

@Override
public Principal getRealmIdentityPrincipal() {
  try {
    if (exists()) {
      if (!this.claims.containsKey(principalClaimName)) {
        throw ElytronMessages.log.tokenRealmFailedToObtainPrincipalWithClaim(principalClaimName);
      }
      return new NamePrincipal(this.claims.getFirst(principalClaimName));
    }
  } catch (Exception e) {
    throw ElytronMessages.log.tokenRealmFailedToObtainPrincipal(e);
  }
  return null;
}