org.mozilla.javascript.serialize
Class ScriptableOutputStream

java.lang.Object
  java.io.OutputStream
      java.io.ObjectOutputStream
          org.mozilla.javascript.serialize.ScriptableOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.DataOutput, java.io.Flushable, java.io.ObjectOutput, java.io.ObjectStreamConstants

public class ScriptableOutputStream
extends java.io.ObjectOutputStream

Class ScriptableOutputStream is an ObjectOutputStream used to serialize JavaScript objects and functions. Note that compiled functions currently cannot be serialized, only interpreted functions. The top-level scope containing the object is not written out, but is instead replaced with another top-level object when the ScriptableInputStream reads in this object. Also, object corresponding to names added to the exclude list are not written out but instead are looked up during deserialization. This approach avoids the creation of duplicate copies of standard objects during deserialization.

Author:

Norris Boyd

Nested Class Summary

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

java.io.ObjectOutputStream.PutField

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

ScriptableOutputStream(java.io.OutputStream out, Scriptable scope)
ScriptableOutputStream constructor.

Method Summary

void	addExcludedName(java.lang.String name) Adds a qualified name to the list of object to be excluded from serialization.
void	addOptionalExcludedName(java.lang.String name) Adds a qualified name to the list of object to be excluded from serialization.
void	excludeStandardObjectNames() Adds the names of the standard objects and their prototypes to the list of excluded names.
boolean	hasExcludedName(java.lang.String name) Returns true if the name is excluded from serialization.
void	removeExcludedName(java.lang.String name) Removes a name from the list of names to exclude.
protected java.lang.Object	replaceObject(java.lang.Object obj)

Methods inherited from class java.io.ObjectOutputStream

annotateClass, annotateProxyClass, close, defaultWriteObject, drain, enableReplaceObject, flush, putFields, reset, useProtocolVersion, write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeClassDescriptor, writeDouble, writeFields, writeFloat, writeInt, writeLong, writeObject, writeObjectOverride, writeShort, writeStreamHeader, writeUnshared, writeUTF

Methods inherited from class java.lang.Object

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

Constructor Detail

ScriptableOutputStream

public ScriptableOutputStream(java.io.OutputStream out,
                              Scriptable scope)
                       throws java.io.IOException

ScriptableOutputStream constructor. Creates a ScriptableOutputStream for use in serializing JavaScript objects. Calls excludeStandardObjectNames.

Parameters:

out - the OutputStream to write to.

scope - the scope containing the object.

Throws:

java.io.IOException

Method Detail

addOptionalExcludedName

public void addOptionalExcludedName(java.lang.String name)

Adds a qualified name to the list of object to be excluded from serialization. Names excluded from serialization are looked up in the new scope and replaced upon deserialization.

Parameters:

name - a fully qualified name (of the form "a.b.c", where "a" must be a property of the top-level object). The object need not exist, in which case the name is ignored.

Throws:

java.lang.IllegalArgumentException - if the object is not a Scriptable.

addExcludedName

public void addExcludedName(java.lang.String name)

Adds a qualified name to the list of object to be excluded from serialization. Names excluded from serialization are looked up in the new scope and replaced upon deserialization.

Parameters:

name - a fully qualified name (of the form "a.b.c", where "a" must be a property of the top-level object)

Throws:

java.lang.IllegalArgumentException - if the object is not found or is not a Scriptable.

hasExcludedName

public boolean hasExcludedName(java.lang.String name)

Returns true if the name is excluded from serialization.

removeExcludedName

public void removeExcludedName(java.lang.String name)

Removes a name from the list of names to exclude.

excludeStandardObjectNames

public void excludeStandardObjectNames()

Adds the names of the standard objects and their prototypes to the list of excluded names.

replaceObject

protected java.lang.Object replaceObject(java.lang.Object obj)
                                  throws java.io.IOException

Overrides:

replaceObject in class java.io.ObjectOutputStream

Throws:

java.io.IOException