40 import java.security.CodeSource;
41 import java.security.Permission;
42 import java.security.PermissionCollection;
43 import sun.misc.Resource;
44 import sun.misc.URLClassPath;
45 import sun.net.www.ParseUtil;
46 import sun.security.util.SecurityConstants;
47
48 /**
49 * This class loader is used to load classes and resources from a search
50 * path of URLs referring to both JAR files and directories. Any URL that
51 * ends with a '/' is assumed to refer to a directory. Otherwise, the URL
52 * is assumed to refer to a JAR file which will be opened as needed.
53 * <p>
54 * The AccessControlContext of the thread that created the instance of
55 * URLClassLoader will be used when subsequently loading classes and
56 * resources.
57 * <p>
58 * The classes that are loaded are by default granted permission only to
59 * access the URLs specified when the URLClassLoader was created.
60 *
61 * @author David Connelly
62 * @since 1.2
63 */
64 public class URLClassLoader extends SecureClassLoader implements Closeable {
65 /* The search path for classes and resources */
66 private final URLClassPath ucp;
67
68 /* The context to be used when loading classes and resources */
69 private final AccessControlContext acc;
70
71 /**
72 * Constructs a new URLClassLoader for the given URLs. The URLs will be
73 * searched in the order specified for classes and resources after first
74 * searching in the specified parent class loader. Any URL that ends with
75 * a '/' is assumed to refer to a directory. Otherwise, the URL is assumed
76 * to refer to a JAR file which will be downloaded and opened as needed.
77 *
78 * <p>If there is a security manager, this method first
79 * calls the security manager's {@code checkCreateClassLoader} method
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40 import java.security.CodeSource;
41 import java.security.Permission;
42 import java.security.PermissionCollection;
43 import sun.misc.Resource;
44 import sun.misc.URLClassPath;
45 import sun.net.www.ParseUtil;
46 import sun.security.util.SecurityConstants;
47
48 /**
49 * This class loader is used to load classes and resources from a search
50 * path of URLs referring to both JAR files and directories. Any URL that
51 * ends with a '/' is assumed to refer to a directory. Otherwise, the URL
52 * is assumed to refer to a JAR file which will be opened as needed.
53 * <p>
54 * The AccessControlContext of the thread that created the instance of
55 * URLClassLoader will be used when subsequently loading classes and
56 * resources.
57 * <p>
58 * The classes that are loaded are by default granted permission only to
59 * access the URLs specified when the URLClassLoader was created.
60 * <p>
61 * Where a JAR file contains the {@link Name#PROFILE Profile} attribute then its
62 * value is the name of the Java SE profile that the library minimally requires.
63 * If this runtime does not support the profile then it causes {@link
64 * java.util.jar.UnsupportedProfileException} to be thrown at some unspecified
65 * time.
66 *
67 * @author David Connelly
68 * @since 1.2
69 */
70 public class URLClassLoader extends SecureClassLoader implements Closeable {
71 /* The search path for classes and resources */
72 private final URLClassPath ucp;
73
74 /* The context to be used when loading classes and resources */
75 private final AccessControlContext acc;
76
77 /**
78 * Constructs a new URLClassLoader for the given URLs. The URLs will be
79 * searched in the order specified for classes and resources after first
80 * searching in the specified parent class loader. Any URL that ends with
81 * a '/' is assumed to refer to a directory. Otherwise, the URL is assumed
82 * to refer to a JAR file which will be downloaded and opened as needed.
83 *
84 * <p>If there is a security manager, this method first
85 * calls the security manager's {@code checkCreateClassLoader} method
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