gate.persist

Class GateAwareObjectInputStream

java.lang.Object

java.io.InputStream

java.io.ObjectInputStream

gate.persist.GateAwareObjectInputStream

All Implemented Interfaces:

Closeable, DataInput, ObjectInput, ObjectStreamConstants, AutoCloseable

public class GateAwareObjectInputStream
extends ObjectInputStream

An ObjectInputStream that attempts to resolve the classes of objects loaded from the stream via the GateClassLoader if they cannot be found by the usual means. This allows LRs to be loaded successfully from a serial datastore when they have features (or annotations with features) whose class is defined in a plugin.

Nested Class Summary

Nested classes/interfaces inherited from class java.io.ObjectInputStream

ObjectInputStream.GetField

Field Summary

Fields inherited from interface java.io.ObjectStreamConstants

baseWireHandle, PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, SC_BLOCK_DATA, SC_ENUM, SC_EXTERNALIZABLE, SC_SERIALIZABLE, SC_WRITE_METHOD, STREAM_MAGIC, STREAM_VERSION, SUBCLASS_IMPLEMENTATION_PERMISSION, SUBSTITUTION_PERMISSION, TC_ARRAY, TC_BASE, TC_BLOCKDATA, TC_BLOCKDATALONG, TC_CLASS, TC_CLASSDESC, TC_ENDBLOCKDATA, TC_ENUM, TC_EXCEPTION, TC_LONGSTRING, TC_MAX, TC_NULL, TC_OBJECT, TC_PROXYCLASSDESC, TC_REFERENCE, TC_RESET, TC_STRING

Constructor Summary

Constructors

Constructor and Description
GateAwareObjectInputStream(InputStream source) Creates a GATE aware object input stream to read from the given source.

Method Summary

Modifier and Type	Method and Description
protected Class<?>	resolveClass(ObjectStreamClass desc) Resolve the class of an object read from the stream.
protected Class<?>	resolveProxyClass(String[] interfaces) Resolve a proxy class that implements the given interfaces.

Methods inherited from class java.io.ObjectInputStream

available, close, defaultReadObject, enableResolveObject, read, read, readBoolean, readByte, readChar, readClassDescriptor, readDouble, readFields, readFloat, readFully, readFully, readInt, readLine, readLong, readObject, readObjectOverride, readShort, readStreamHeader, readUnshared, readUnsignedByte, readUnsignedShort, readUTF, registerValidation, resolveObject, skipBytes

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.ObjectInput

read, skip

Constructor Detail

GateAwareObjectInputStream

public GateAwareObjectInputStream(InputStream source)
                           throws IOException

Creates a GATE aware object input stream to read from the given source.

Throws:

IOException

Method Detail

resolveClass

protected Class<?> resolveClass(ObjectStreamClass desc)
                         throws IOException,
                                ClassNotFoundException

Resolve the class of an object read from the stream. First attempts to use the default resolution method provided by ObjectInputStream. If that fails with a ClassNotFoundException then tries to resolve the class via the GATE classloader instead.

Overrides:

resolveClass in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

resolveProxyClass

protected Class<?> resolveProxyClass(String[] interfaces)
                              throws IOException,
                                     ClassNotFoundException

Resolve a proxy class that implements the given interfaces. First attempts to use the default resolution method provided by ObjectInputStream. If that fails with a ClassNotFoundException then tries to resolve the interfaces and create the proxy class using the GATE classloader instead.

Overrides:

resolveProxyClass in class ObjectInputStream

Throws:

IOException

ClassNotFoundException