Package org.codehaus.classworlds

Class RealmClassLoader

  • All Implemented Interfaces:
    java.io.Closeable, java.lang.AutoCloseable
    Direct Known Subclasses:
    UberJarRealmClassLoader
    class RealmClassLoader
extends java.net.URLClassLoader
    Classloader for ClassRealms.
    Version:
    $Id: RealmClassLoader.java 126 2006-01-12 04:17:51Z $
    Author:
    bob mcwhirter

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      (package private) void addConstituent​(java.net.URL constituent)
      Add a constituent to this realm for locating classes.
      java.net.URL findResource​(java.lang.String name)
      Find a resource within this ClassLoader only (don't delegate to the parent).
      java.util.Enumeration findResources​(java.lang.String name)  
      java.util.Enumeration findResourcesDirect​(java.lang.String name)
      Find resources from this ClassLoader, and don't search the realm.
      byte[] getBytesToEndOfStream​(java.io.DataInputStream in)
      Helper method for addConstituent that reads in a DataInputStream and returns it as a byte[] It attempts to use in.available - the size of the file - else defaults to 2048
      (package private) DefaultClassRealm getRealm()
      Retrieve the realm.
      java.net.URL getResource​(java.lang.String name)  
      java.net.URL getResourceDirect​(java.lang.String name)
      Get a resource from this ClassLoader, and don't search the realm.
      java.net.URL[] getURLs()
      Retrieve the URLs used by this ClassLoader.
      protected java.lang.Class loadClass​(java.lang.String name, boolean resolve)
      Load a class.
      (package private) java.lang.Class loadClassDirect​(java.lang.String name)
      Load a class directly from this classloader without defering through any other ClassRealm.

      • Methods inherited from class java.net.URLClassLoader

        addURL, close, definePackage, findClass, getPermissions, getResourceAsStream, newInstance, newInstance

      • Methods inherited from class java.security.SecureClassLoader

        defineClass, defineClass

      • Methods inherited from class java.lang.ClassLoader

        clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • RealmClassLoader

        RealmClassLoader​(DefaultClassRealm realm)
        Construct.
        Parameters:
        realm - The realm for which this loads.

      • RealmClassLoader

        RealmClassLoader​(DefaultClassRealm realm,
                 java.lang.ClassLoader classLoader)
        Construct.
        Parameters:
        realm - The realm for which this loads.
        classLoader - The parent ClassLoader.

    • Method Detail

      • addConstituent

        void addConstituent​(java.net.URL constituent)
        Add a constituent to this realm for locating classes. If the url definition ends in .class its a BytesURLStreamHandler so use defineClass insead. addURL is still called for byte[] even though it has no affect and we use defineClass instead, this is for consistentency and to allow access to the class with getURLs()
        Parameters:
        constituent - URL to contituent jar or directory.

      • getBytesToEndOfStream

        public byte[] getBytesToEndOfStream​(java.io.DataInputStream in)
                             throws java.io.IOException
        Helper method for addConstituent that reads in a DataInputStream and returns it as a byte[] It attempts to use in.available - the size of the file - else defaults to 2048
        Throws:
        java.io.IOException

      • loadClassDirect

        java.lang.Class loadClassDirect​(java.lang.String name)
                         throws java.lang.ClassNotFoundException
        Load a class directly from this classloader without defering through any other ClassRealm.
        Parameters:
        name - The name of the class to load.
        Returns:
        The loaded class.
        Throws:
        java.lang.ClassNotFoundException - If the class could not be found.

      • loadClass

        protected java.lang.Class loadClass​(java.lang.String name,
                                    boolean resolve)
                             throws java.lang.ClassNotFoundException
        Load a class.
        Overrides:
        loadClass in class java.lang.ClassLoader
        Parameters:
        name - The name of the class to load.
        resolve - If true then resolve the class.
        Returns:
        The loaded class.
        Throws:
        java.lang.ClassNotFoundException - If the class cannot be found.

      • getURLs

        public java.net.URL[] getURLs()
        Retrieve the URLs used by this ClassLoader.
        Overrides:
        getURLs in class java.net.URLClassLoader
        Returns:
        The urls.

      • findResource

        public java.net.URL findResource​(java.lang.String name)
        Find a resource within this ClassLoader only (don't delegate to the parent).
        Overrides:
        findResource in class java.net.URLClassLoader
        Returns:
        The resource.

      • getResource

        public java.net.URL getResource​(java.lang.String name)
        Overrides:
        getResource in class java.lang.ClassLoader

      • getResourceDirect

        public java.net.URL getResourceDirect​(java.lang.String name)
        Get a resource from this ClassLoader, and don't search the realm. Otherwise we'd recurse indefinitely.
        Returns:
        The resource.

      • findResources

        public java.util.Enumeration findResources​(java.lang.String name)
                                    throws java.io.IOException
        Overrides:
        findResources in class java.net.URLClassLoader
        Throws:
        java.io.IOException

      • findResourcesDirect

        public java.util.Enumeration findResourcesDirect​(java.lang.String name)
                                          throws java.io.IOException
        Find resources from this ClassLoader, and don't search the realm. Otherwise we'd recurse indefinitely.
        Returns:
        The resource.
        Throws:
        java.io.IOException