https://github.com/FasterXML/jackson-core: Core Jackson processing abstractions (aka Streaming API), implementation for JSON (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
package com.fasterxml.jackson.core.io;

import java.io.*;


Handler class that can be used to decorate output destinations.
Typical use is to use a filter abstraction (filtered output stream,
writer) around original output destination, and apply additional
processing during write operations.

/**
 * Handler class that can be used to decorate output destinations.
 * Typical use is to use a filter abstraction (filtered output stream,
 * writer) around original output destination, and apply additional
 * processing during write operations.
 */
@SuppressWarnings("serial")
public abstract class OutputDecorator implements java.io.Serializable // since 2.1
{
    
Method called by JsonFactory instance when creating generator for given OutputStream, when this decorator has been registered. 
Params:
  • ctxt – IO context in use (provides access to declared encoding)
  • out – Original output destination
Returns:OutputStream to use; either passed in argument, or something that
  calls it
/**
     * Method called by {@link com.fasterxml.jackson.core.JsonFactory} instance when
     * creating generator for given {@link OutputStream}, when this decorator
     * has been registered.
     * 
     * @param ctxt IO context in use (provides access to declared encoding)
     * @param out Original output destination
     * 
     * @return OutputStream to use; either passed in argument, or something that
     *   calls it
     */
    public abstract OutputStream decorate(IOContext ctxt, OutputStream out) throws IOException;

    
Method called by JsonFactory instance when creating generator for given Writer, when this decorator has been registered. 
Params:
  • ctxt – IO context in use (provides access to declared encoding)
  • w – Original output writer
Returns:Writer to use; either passed in argument, or something that calls it
/**
     * Method called by {@link com.fasterxml.jackson.core.JsonFactory} instance when
     * creating generator for given {@link Writer}, when this decorator
     * has been registered.
     * 
     * @param ctxt IO context in use (provides access to declared encoding)
     * @param w Original output writer
     * 
     * @return Writer to use; either passed in argument, or something that calls it
     */
    public abstract Writer decorate(IOContext ctxt, Writer w) throws IOException;
}