Moving modules around so the runtime is under one master pom and can be built without building other modules that are in the repository
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28 import java.io.ObjectOutput;
29 import java.io.ObjectInput;
32 * Only the identity of the class of an Externalizable instance is
33 * written in the serialization stream and it is the responsibility
34 * of the class to save and restore the contents of its instances.
36 * The writeExternal and readExternal methods of the Externalizable
37 * interface are implemented by a class to give the class complete
38 * control over the format and contents of the stream for an object
39 * and its supertypes. These methods must explicitly
40 * coordinate with the supertype to save its state. These methods supersede
41 * customized implementations of writeObject and readObject methods.<br>
43 * Object Serialization uses the Serializable and Externalizable
44 * interfaces. Object persistence mechanisms can use them as well. Each
45 * object to be stored is tested for the Externalizable interface. If
46 * the object supports Externalizable, the writeExternal method is called. If the
47 * object does not support Externalizable and does implement
48 * Serializable, the object is saved using
49 * ObjectOutputStream. <br> When an Externalizable object is
50 * reconstructed, an instance is created using the public no-arg
51 * constructor, then the readExternal method called. Serializable
52 * objects are restored by reading them from an ObjectInputStream.<br>
54 * An Externalizable instance can designate a substitution object via
55 * the writeReplace and readResolve methods documented in the Serializable
59 * @see java.io.ObjectOutputStream
60 * @see java.io.ObjectInputStream
61 * @see java.io.ObjectOutput
62 * @see java.io.ObjectInput
63 * @see java.io.Serializable
66 public interface Externalizable extends java.io.Serializable {
68 * The object implements the writeExternal method to save its contents
69 * by calling the methods of DataOutput for its primitive values or
70 * calling the writeObject method of ObjectOutput for objects, strings,
73 * @serialData Overriding methods should use this tag to describe
74 * the data layout of this Externalizable object.
75 * List the sequence of element types and, if possible,
76 * relate the element to a public/protected field and/or
77 * method of this Externalizable class.
79 * @param out the stream to write the object to
80 * @exception IOException Includes any I/O exceptions that may occur
82 void writeExternal(ObjectOutput out) throws IOException;
85 * The object implements the readExternal method to restore its
86 * contents by calling the methods of DataInput for primitive
87 * types and readObject for objects, strings and arrays. The
88 * readExternal method must read the values in the same sequence
89 * and with the same types as were written by writeExternal.
91 * @param in the stream to read data from in order to restore the object
92 * @exception IOException if I/O errors occur
93 * @exception ClassNotFoundException If the class for an object being
94 * restored cannot be found.
96 void readExternal(ObjectInput in) throws IOException, ClassNotFoundException;