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.util.FileUtil extends java.lang.Enum<org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil>
  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.util.FileUtil
  super_class: java.lang.Enum
{
  public static final org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil INSTANCE;
    descriptor: Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  private static final org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil[] ENUM$VALUES;
    descriptor: [Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
    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
            ldc Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.$assertionsDisabled:Z
         3: .line 32
            new org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil
            dup
            ldc "INSTANCE"
            iconst_0
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.<init>:(Ljava/lang/String;I)V
            putstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.INSTANCE:Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            iconst_1
            anewarray org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil
            dup
            iconst_0
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.INSTANCE:Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            aastore
            putstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.ENUM$VALUES:[Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            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.util.FileUtil this
         0: .line 30
            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.util.FileUtil this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
    MethodParameters:
               Name  Flags
      $enum$name     
      $enum$ordinal  

  public java.io.File fileFromClassLoaderResource(java.lang.String, java.lang.ClassLoader);
    descriptor: (Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/io/File;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=6, args_size=3
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
        start local 1 // java.lang.String path
        start local 2 // java.lang.ClassLoader cl
         0: .line 42
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.$assertionsDisabled:Z
            ifne 2
            aload 1 /* path */
            ifnull 1
            aload 1 /* path */
            invokevirtual java.lang.String.length:()I
            ifgt 2
      StackMap locals:
      StackMap stack:
         1: new java.lang.AssertionError
            dup
            ldc "path must be specified"
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         2: .line 43
      StackMap locals:
      StackMap stack:
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.$assertionsDisabled:Z
            ifne 3
            aload 2 /* cl */
            ifnonnull 3
            new java.lang.AssertionError
            dup
            ldc "ClassLoader is required"
            invokespecial java.lang.AssertionError.<init>:(Ljava/lang/Object;)V
            athrow
         3: .line 44
      StackMap locals:
      StackMap stack:
            aload 2 /* cl */
            aload 1 /* path */
            invokevirtual java.lang.ClassLoader.getResource:(Ljava/lang/String;)Ljava/net/URL;
            astore 3 /* url */
        start local 3 // java.net.URL url
         4: .line 45
            aload 3 /* url */
            new java.lang.StringBuilder
            dup
            aload 1 /* path */
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc " doesn't exist or can't be accessed on from "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 2 /* cl */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.notNull:(Ljava/lang/Object;Ljava/lang/String;)V
         5: .line 47
            aconst_null
            astore 4 /* file */
        start local 4 // java.io.File file
         6: .line 49
            new java.io.File
            dup
            aload 3 /* url */
            invokevirtual java.net.URL.toURI:()Ljava/net/URI;
            invokespecial java.io.File.<init>:(Ljava/net/URI;)V
            astore 4 /* file */
         7: .line 50
            aload 4 /* file */
            ldc "Should be readable"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.readable:(Ljava/io/File;Ljava/lang/String;)V
         8: .line 51
            goto 20
      StackMap locals: org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil java.lang.String java.lang.ClassLoader java.net.URL java.io.File
      StackMap stack: java.lang.IllegalArgumentException
         9: pop
        10: .line 53
            new java.io.File
            dup
            aload 3 /* url */
            invokevirtual java.net.URL.getPath:()Ljava/lang/String;
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            astore 4 /* file */
        11: .line 54
            aload 4 /* file */
            ldc "Should be readable"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.readable:(Ljava/io/File;Ljava/lang/String;)V
        12: .line 55
            goto 20
      StackMap locals:
      StackMap stack: java.lang.RuntimeException
        13: pop
        14: .line 56
            aconst_null
            astore 4 /* file */
            goto 20
        15: .line 59
      StackMap locals:
      StackMap stack: java.net.URISyntaxException
            pop
        16: .line 61
            new java.io.File
            dup
            aload 3 /* url */
            invokevirtual java.net.URL.getPath:()Ljava/lang/String;
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            astore 4 /* file */
        17: .line 62
            goto 20
      StackMap locals:
      StackMap stack: java.lang.RuntimeException
        18: pop
        19: .line 64
            aconst_null
            astore 4 /* file */
        20: .line 69
      StackMap locals:
      StackMap stack:
            aload 4 /* file */
            ifnonnull 28
        21: .line 72
            aload 0 /* this */
            aload 1 /* path */
            aload 2 /* cl */
            invokevirtual org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.getLocalResourcePathFromResourceName:(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/String;
            astore 5 /* localResourcePath */
        start local 5 // java.lang.String localResourcePath
        22: .line 73
            new java.io.File
            dup
            aload 5 /* localResourcePath */
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            astore 4 /* file */
        end local 5 // java.lang.String localResourcePath
        23: .line 74
            goto 28
      StackMap locals:
      StackMap stack: java.lang.RuntimeException
        24: pop
        25: .line 76
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Resource + "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* path */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " in "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 2 /* cl */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc " points to "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 3 /* url */
            invokevirtual java.net.URL.toString:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
        26: .line 77
            ldc ", and cannot be resolved as a "
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc Ljava/io/File;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
        27: .line 76
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        28: .line 80
      StackMap locals:
      StackMap stack:
            aload 4 /* file */
            areturn
        end local 4 // java.io.File file
        end local 3 // java.net.URL url
        end local 2 // java.lang.ClassLoader cl
        end local 1 // java.lang.String path
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
      LocalVariableTable:
        Start  End  Slot               Name  Signature
            0   29     0               this  Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            0   29     1               path  Ljava/lang/String;
            0   29     2                 cl  Ljava/lang/ClassLoader;
            4   29     3                url  Ljava/net/URL;
            6   29     4               file  Ljava/io/File;
           22   23     5  localResourcePath  Ljava/lang/String;
      Exception table:
        from    to  target  type
           6     8       9  Class java.lang.IllegalArgumentException
          10    12      13  Class java.lang.RuntimeException
           6     8      15  Class java.net.URISyntaxException
          16    17      18  Class java.lang.RuntimeException
          21    23      24  Class java.lang.RuntimeException
    MethodParameters:
      Name  Flags
      path  final
      cl    final

  private java.lang.String getLocalResourcePathFromResourceName(java.lang.String, java.lang.ClassLoader);
    descriptor: (Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=5, args_size=3
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
        start local 1 // java.lang.String resourceName
        start local 2 // java.lang.ClassLoader cl
         0: .line 93
            aload 2 /* cl */
            aload 1 /* resourceName */
            invokevirtual java.lang.ClassLoader.getResource:(Ljava/lang/String;)Ljava/net/URL;
            astore 3 /* resourceUrl */
        start local 3 // java.net.URL resourceUrl
         1: .line 94
            aload 3 /* resourceUrl */
            new java.lang.StringBuilder
            dup
            aload 1 /* resourceName */
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc " doesn't exist or can't be accessed on classpath"
            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.notNull:(Ljava/lang/Object;Ljava/lang/String;)V
         2: .line 97
            aload 0 /* this */
            aload 1 /* resourceName */
            invokevirtual org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.temporaryFile:(Ljava/lang/String;)Ljava/io/File;
            astore 4 /* localResource */
        start local 4 // java.io.File localResource
         3: .line 98
            aload 4 /* localResource */
            invokevirtual java.io.File.deleteOnExit:()V
         4: .line 99
            aload 3 /* resourceUrl */
            invokevirtual java.net.URL.openStream:()Ljava/io/InputStream;
            new java.io.FileOutputStream
            dup
            aload 4 /* localResource */
            invokespecial java.io.FileOutputStream.<init>:(Ljava/io/File;)V
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.IOUtil.copyWithClose:(Ljava/io/InputStream;Ljava/io/OutputStream;)V
         5: .line 100
            aload 4 /* localResource */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
         6: areturn
        end local 4 // java.io.File localResource
         7: .line 101
      StackMap locals: org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil java.lang.String java.lang.ClassLoader java.net.URL
      StackMap stack: java.io.IOException
            astore 4 /* e */
        start local 4 // java.io.IOException e
         8: .line 102
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "Unable to open resource name specified by "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 1 /* resourceName */
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            aload 4 /* e */
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;Ljava/lang/Throwable;)V
            athrow
        end local 4 // java.io.IOException e
        end local 3 // java.net.URL resourceUrl
        end local 2 // java.lang.ClassLoader cl
        end local 1 // java.lang.String resourceName
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    9     0           this  Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            0    9     1   resourceName  Ljava/lang/String;
            0    9     2             cl  Ljava/lang/ClassLoader;
            1    9     3    resourceUrl  Ljava/net/URL;
            3    7     4  localResource  Ljava/io/File;
            8    9     4              e  Ljava/io/IOException;
      Exception table:
        from    to  target  type
           2     6       7  Class java.io.IOException
    MethodParameters:
              Name  Flags
      resourceName  final
      cl            final

  private java.io.File temporaryFile(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/io/File;
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
        start local 1 // java.lang.String resourceName
         0: .line 108
            new java.io.File
            dup
            ldc "java.io.tmpdir"
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.SecurityActions.getProperty:(Ljava/lang/String;)Ljava/lang/String;
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            astore 2 /* tmpDir */
        start local 2 // java.io.File tmpDir
         1: .line 110
            aload 2 /* tmpDir */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
         2: .line 111
            new java.lang.StringBuilder
            dup
            ldc "Unable to access temporary directory at "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* tmpDir */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         3: .line 110
            invokestatic org.jboss.shrinkwrap.resolver.impl.maven.util.Validate.writeableDirectory:(Ljava/lang/String;Ljava/lang/String;)V
         4: .line 113
            aload 1 /* resourceName */
            ldc "/"
            ldc "-"
            invokevirtual java.lang.String.replace:(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;
            ldc "\\"
            ldc "-"
            invokevirtual java.lang.String.replace:(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;
         5: .line 114
            getstatic java.io.File.pathSeparator:Ljava/lang/String;
            ldc "-"
            invokevirtual java.lang.String.replace:(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;
            ldc "\\s"
            ldc "-"
            invokevirtual java.lang.String.replaceAll:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
            ldc ".tmp"
            aload 2 /* tmpDir */
         6: .line 113
            invokestatic java.io.File.createTempFile:(Ljava/lang/String;Ljava/lang/String;Ljava/io/File;)Ljava/io/File;
            astore 3 /* localResource */
        start local 3 // java.io.File localResource
         7: .line 115
            aload 3 /* localResource */
            invokevirtual java.io.File.deleteOnExit:()V
         8: .line 116
            aload 3 /* localResource */
            areturn
        end local 3 // java.io.File localResource
        end local 2 // java.io.File tmpDir
        end local 1 // java.lang.String resourceName
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    9     0           this  Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            0    9     1   resourceName  Ljava/lang/String;
            1    9     2         tmpDir  Ljava/io/File;
            7    9     3  localResource  Ljava/io/File;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
              Name  Flags
      resourceName  final

  public static org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil[] values();
    descriptor: ()[Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=3, args_size=0
         0: .line 1
            getstatic org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil.ENUM$VALUES:[Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            dup
            astore 0
            iconst_0
            aload 0
            arraylength
            dup
            istore 1
            anewarray org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil
            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.util.FileUtil valueOf(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
         0: .line 1
            ldc Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;
            aload 0
            invokestatic java.lang.Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;
            checkcast org.jboss.shrinkwrap.resolver.impl.maven.util.FileUtil
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      name  
}
Signature: Ljava/lang/Enum<Lorg/jboss/shrinkwrap/resolver/impl/maven/util/FileUtil;>;
SourceFile: "FileUtil.java"