org.apache.commons.io.serialization

## Class ValidatingObjectInputStream

- java.lang.Object
- - java.io.InputStream
  - - java.io.ObjectInputStream
    - - org.apache.commons.io.serialization.ValidatingObjectInputStream

- All Implemented Interfaces:
    Closeable, DataInput, ObjectInput, ObjectStreamConstants, AutoCloseable

      public class ValidatingObjectInputStream
      extends ObjectInputStream

  An `ObjectInputStream` that's restricted to deserialize a limited set of classes.

  Various accept/reject methods allow for specifying which classes can be deserialized.

  Design inspired by IBM DeveloperWorks Article.

- - ### 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
    `ValidatingObjectInputStream(InputStream input)` Constructs an object to deserialize the specified input stream.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `ValidatingObjectInputStream` | `accept(Class<?>... classes)` Accept the specified classes for deserialization, unless they are otherwise rejected.
    `ValidatingObjectInputStream` | `accept(ClassNameMatcher m)` Accept class names where the supplied ClassNameMatcher matches for deserialization, unless they are otherwise rejected.
    `ValidatingObjectInputStream` | `accept(Pattern pattern)` Accept class names that match the supplied pattern for deserialization, unless they are otherwise rejected.
    `ValidatingObjectInputStream` | `accept(String... patterns)` Accept the wildcard specified classes for deserialization, unless they are otherwise rejected.
    `protected void` | `invalidClassNameFound(String className)` Called to throw `InvalidClassException` if an invalid class name is found during deserialization.
    `ValidatingObjectInputStream` | `reject(Class<?>... classes)` Reject the specified classes for deserialization, even if they are otherwise accepted.
    `ValidatingObjectInputStream` | `reject(ClassNameMatcher m)` Reject class names where the supplied ClassNameMatcher matches for deserialization, even if they are otherwise accepted.
    `ValidatingObjectInputStream` | `reject(Pattern pattern)` Reject class names that match the supplied pattern for deserialization, even if they are otherwise accepted.
    `ValidatingObjectInputStream` | `reject(String... patterns)` Reject the wildcard specified classes for deserialization, even if they are otherwise accepted.
    `protected Class<?>` | `resolveClass(ObjectStreamClass osc)`

    - ### 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, resolveProxyClass, 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

    - #### ValidatingObjectInputStream

          public ValidatingObjectInputStream(InputStream input)
                                      throws IOException

      Constructs an object to deserialize the specified input stream. At least one accept method needs to be called to specify which classes can be deserialized, as by default no classes are accepted.
      Parameters:
        `input` - an input stream
      Throws:
        `IOException` - if an I/O error occurs while reading stream header

  - ### Method Detail

    - #### invalidClassNameFound

          protected void invalidClassNameFound(String className)
                                        throws InvalidClassException

      Called to throw `InvalidClassException` if an invalid class name is found during deserialization. Can be overridden, for example to log those class names.
      Parameters:
        `className` - name of the invalid class
      Throws:
        `InvalidClassException` - if the specified class is not allowed

    - #### resolveClass

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

      Overrides:
        `resolveClass` in class `ObjectInputStream`
      Throws:
        `IOException`
        `ClassNotFoundException`

    - #### accept

          public ValidatingObjectInputStream accept(Class<?>... classes)

      Accept the specified classes for deserialization, unless they are otherwise rejected.
      Parameters:
        `classes` - Classes to accept
      Returns:
        this object

    - #### reject

          public ValidatingObjectInputStream reject(Class<?>... classes)

      Reject the specified classes for deserialization, even if they are otherwise accepted.
      Parameters:
        `classes` - Classes to reject
      Returns:
        this object

    - #### accept

          public ValidatingObjectInputStream accept(String... patterns)

      Accept the wildcard specified classes for deserialization, unless they are otherwise rejected.
      Parameters:
        `patterns` - Wildcard filename patterns as defined by `FilenameUtils.wildcardMatch`
      Returns:
        this object

    - #### reject

          public ValidatingObjectInputStream reject(String... patterns)

      Reject the wildcard specified classes for deserialization, even if they are otherwise accepted.
      Parameters:
        `patterns` - Wildcard filename patterns as defined by `FilenameUtils.wildcardMatch`
      Returns:
        this object

    - #### accept

          public ValidatingObjectInputStream accept(Pattern pattern)

      Accept class names that match the supplied pattern for deserialization, unless they are otherwise rejected.
      Parameters:
        `pattern` - standard Java regexp
      Returns:
        this object

    - #### reject

          public ValidatingObjectInputStream reject(Pattern pattern)

      Reject class names that match the supplied pattern for deserialization, even if they are otherwise accepted.
      Parameters:
        `pattern` - standard Java regexp
      Returns:
        this object

    - #### accept

          public ValidatingObjectInputStream accept(ClassNameMatcher m)

      Accept class names where the supplied ClassNameMatcher matches for deserialization, unless they are otherwise rejected.
      Parameters:
        `m` - the matcher to use
      Returns:
        this object

    - #### reject

          public ValidatingObjectInputStream reject(ClassNameMatcher m)

      Reject class names where the supplied ClassNameMatcher matches for deserialization, even if they are otherwise accepted.
      Parameters:
        `m` - the matcher to use
      Returns:
        this object

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