http://www.jboss.org/shrinkwrap-resolver-parent/shrinkwrap-resolver-impl-maven: Implementation for Resolving Dependencies from a Maven Backend (JBoss by Red Hat) 
public final class org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask extends java.lang.Enum<org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask> implements org.jboss.shrinkwrap.resolver.impl.maven.task.MavenWorkingSessionTask<org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession>
  minor version: 0
  major version: 59
  flags: flags: (0x4031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_ANNOTATION
  this_class: org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask
  super_class: java.lang.Enum
{
  public static final org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask INSTANCE;
    descriptor: Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  private static final java.lang.String POM_FILE_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "maven.execution.pom-file"

  private static final java.lang.String OFFLINE_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "maven.execution.offline"

  private static final java.lang.String USER_SETTINGS_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "maven.execution.user-settings"

  private static final java.lang.String GLOBAL_SETTINGS_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "maven.execution.global-settings"

  private static final java.lang.String ACTIVE_PROFILES_KEY;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "maven.execution.active-profiles"

  private static final java.lang.String CONSTRUCTION_EXCEPTION;
    descriptor: Ljava/lang/String;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: "Configuration from environment requires that user has following properties set, however they were not detected in runtime environment:\n\tmaven.execution.pom-file\n\tmaven.execution.offline\n\tmaven.execution.user-settings\n\tmaven.execution.global-settings\n\tmaven.execution.active-profiles\n\nYou should enable ShrinkWrap Maven Resolver Plugin to get them set for you automatically if executing from Maven via adding following to your <build> section:\n\n<plugin>\n\t<groupId>org.jboss.shrinkwrap.resolver</groupId>\n\t<artifactId>shrinkwrap-resolver-maven-plugin</artifactId>\n\t<executions>\n\t\t<execution>\n\t\t\t<goals>\n\t\t\t\t<goal>propagate-execution-context</goal>\n\t\t\t</goals>\n\t\t</execution>\n\t</executions>\n</plugin>\n"

  private static final org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask[] ENUM$VALUES;
    descriptor: [Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
    flags: (0x101a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=4, locals=0, args_size=0
         0: .line 30
            new org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask
            dup
            ldc "INSTANCE"
            iconst_0
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.<init>:(Ljava/lang/String;I)V
            putstatic org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.INSTANCE:Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
            iconst_1
            anewarray org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask
            dup
            iconst_0
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.INSTANCE:Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
            aastore
            putstatic org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.ENUM$VALUES:[Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
         1: .line 64
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>(java.lang.String, int);
    descriptor: (Ljava/lang/String;I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=3
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask this
         0: .line 29
            aload 0 /* this */
            aload 1
            iload 2
            invokespecial java.lang.Enum.<init>:(Ljava/lang/String;I)V
            return
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
    MethodParameters:
               Name  Flags
      $enum$name     
      $enum$ordinal  

  public org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession execute(org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession);
    descriptor: (Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=7, args_size=2
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask this
        start local 1 // org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession session
         0: .line 69
            ldc "maven.execution.pom-file"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.task.SecurityActions.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            astore 2 /* pomFile */
        start local 2 // java.lang.String pomFile
         1: .line 70
            aload 2 /* pomFile */
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.isNullOrEmpty:(Ljava/lang/String;)Z
            ifeq 3
         2: .line 71
            new org.jboss.shrinkwrap.resolver.api.maven.InvalidEnvironmentException
            dup
            ldc "Configuration from environment requires that user has following properties set, however they were not detected in runtime environment:\n\tmaven.execution.pom-file\n\tmaven.execution.offline\n\tmaven.execution.user-settings\n\tmaven.execution.global-settings\n\tmaven.execution.active-profiles\n\nYou should enable ShrinkWrap Maven Resolver Plugin to get them set for you automatically if executing from Maven via adding following to your <build> section:\n\n<plugin>\n\t<groupId>org.jboss.shrinkwrap.resolver</groupId>\n\t<artifactId>shrinkwrap-resolver-maven-plugin</artifactId>\n\t<executions>\n\t\t<execution>\n\t\t\t<goals>\n\t\t\t\t<goal>propagate-execution-context</goal>\n\t\t\t</goals>\n\t\t</execution>\n\t</executions>\n</plugin>\n"
            invokespecial org.jboss.shrinkwrap.resolver.api.maven.InvalidEnvironmentException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 73
      StackMap locals: java.lang.String
      StackMap stack:
            aload 2 /* pomFile */
            new java.lang.StringBuilder
            dup
            ldc "POM file "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* pomFile */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " does not represent a readable file"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.isReadable:(Ljava/lang/String;Ljava/lang/String;)V
         4: .line 75
            ldc "maven.execution.user-settings"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.task.SecurityActions.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            astore 3 /* userSettings */
        start local 3 // java.lang.String userSettings
         5: .line 76
            aload 3 /* userSettings */
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.isNullOrEmpty:(Ljava/lang/String;)Z
            ifeq 7
         6: .line 77
            new org.jboss.shrinkwrap.resolver.api.maven.InvalidEnvironmentException
            dup
            ldc "Configuration from environment requires that user has following properties set, however they were not detected in runtime environment:\n\tmaven.execution.pom-file\n\tmaven.execution.offline\n\tmaven.execution.user-settings\n\tmaven.execution.global-settings\n\tmaven.execution.active-profiles\n\nYou should enable ShrinkWrap Maven Resolver Plugin to get them set for you automatically if executing from Maven via adding following to your <build> section:\n\n<plugin>\n\t<groupId>org.jboss.shrinkwrap.resolver</groupId>\n\t<artifactId>shrinkwrap-resolver-maven-plugin</artifactId>\n\t<executions>\n\t\t<execution>\n\t\t\t<goals>\n\t\t\t\t<goal>propagate-execution-context</goal>\n\t\t\t</goals>\n\t\t</execution>\n\t</executions>\n</plugin>\n"
            invokespecial org.jboss.shrinkwrap.resolver.api.maven.InvalidEnvironmentException.<init>:(Ljava/lang/String;)V
            athrow
         7: .line 80
      StackMap locals: java.lang.String
      StackMap stack:
            iconst_1
            istore 4 /* hasSettingsXml */
        start local 4 // boolean hasSettingsXml
         8: .line 82
            aload 3 /* userSettings */
            new java.lang.StringBuilder
            dup
            ldc "Settings.xml file "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 3 /* userSettings */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         9: .line 83
            ldc " does not represent a readable file"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
        10: .line 82
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.isReadable:(Ljava/lang/String;Ljava/lang/String;)V
        11: .line 84
            goto 14
      StackMap locals: org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession java.lang.String java.lang.String int
      StackMap stack: java.lang.IllegalArgumentException
        12: pop
        13: .line 85
            iconst_0
            istore 4 /* hasSettingsXml */
        14: .line 88
      StackMap locals:
      StackMap stack:
            iload 4 /* hasSettingsXml */
            ifeq 16
        15: .line 89
            new org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromFileTask
            dup
            aload 3 /* userSettings */
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromFileTask.<init>:(Ljava/lang/String;)V
            aload 1 /* session */
            invokevirtual org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromFileTask.execute:(Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
            astore 1 /* session */
        16: .line 92
      StackMap locals:
      StackMap stack:
            ldc "maven.execution.active-profiles"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.task.SecurityActions.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            astore 5 /* activeProfiles */
        start local 5 // java.lang.String activeProfiles
        17: .line 93
            iconst_0
            anewarray java.lang.String
            astore 6 /* profiles */
        start local 6 // java.lang.String[] profiles
        18: .line 94
            aload 5 /* activeProfiles */
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.isNullOrEmpty:(Ljava/lang/String;)Z
            ifne 20
        19: .line 95
            aload 5 /* activeProfiles */
            ldc ","
            invokevirtual java.lang.String.split:(Ljava/lang/String;)[Ljava/lang/String;
            astore 6 /* profiles */
        20: .line 98
      StackMap locals: java.lang.String java.lang.String[]
      StackMap stack:
            aload 2 /* pomFile */
            aload 6 /* profiles */
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.task.LoadPomTask.loadPomFromFile:(Ljava/lang/String;[Ljava/lang/String;)Lorg/jboss/shrinkwrap/resolver/impl/maven/task/LoadPomTask;
            aload 1 /* session */
            invokevirtual org.jboss.shrinkwrap.resolver.impl.maven.task.LoadPomTask.execute:(Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
            areturn
        end local 6 // java.lang.String[] profiles
        end local 5 // java.lang.String activeProfiles
        end local 4 // boolean hasSettingsXml
        end local 3 // java.lang.String userSettings
        end local 2 // java.lang.String pomFile
        end local 1 // org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession session
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0   21     0            this  Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
            0   21     1         session  Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
            1   21     2         pomFile  Ljava/lang/String;
            5   21     3    userSettings  Ljava/lang/String;
            8   21     4  hasSettingsXml  Z
           17   21     5  activeProfiles  Ljava/lang/String;
           18   21     6        profiles  [Ljava/lang/String;
      Exception table:
        from    to  target  type
           8    11      12  Class java.lang.IllegalArgumentException
    MethodParameters:
         Name  Flags
      session  

  public static org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask[] values();
    descriptor: ()[Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=3, args_size=0
         0: .line 1
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.ENUM$VALUES:[Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
            dup
            astore 0
            iconst_0
            aload 0
            arraylength
            dup
            istore 1
            anewarray org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask
            dup
            astore 2
            iconst_0
            iload 1
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
            aload 2
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask valueOf(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
         0: .line 1
            ldc Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;
            aload 0
            invokestatic java.lang.Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;
            checkcast org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      name  

  public java.lang.Object execute(org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession);
    descriptor: (Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual org.jboss.shrinkwrap.resolver.impl.maven.task.ConfigureSettingsFromPluginTask.execute:(Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Enum<Lorg/jboss/shrinkwrap/resolver/impl/maven/task/ConfigureSettingsFromPluginTask;>;Lorg/jboss/shrinkwrap/resolver/impl/maven/task/MavenWorkingSessionTask<Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;>;
SourceFile: "ConfigureSettingsFromPluginTask.java"