dataprocessor.java

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/*
 * Copyright 2004 Carnegie Mellon University.  
 * Portions Copyright 2004 Sun Microsystems, Inc.  
 * Portions Copyright 2004 Mitsubishi Electric Research Laboratories.
 * All Rights Reserved.  Use is subject to license terms.
 * 
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL 
 * WARRANTIES.
 *
 * @see FrontEnd
 */
package edu.cmu.sphinx.frontend;

import edu.cmu.sphinx.util.props.Configurable;

/**
 * A processor that performs a signal processing function. Since a
 * DataProcessor usually belongs to a particular front end pipeline, you can
 * name the pipeline it belongs to in the
 * {@link #initialize() initialize}
 * method. (Note, however, that it is not always the case that a DataProcessor
 * belongs to a particular pipeline. For example, the
 * {@link edu.cmu.sphinx.frontend.util.Microphone Microphone}class is a
 * DataProcessor, but it usually does not belong to any particular pipeline.
 * <p>
 * Each DataProcessor usually have a predecessor as well. This is the previous
 * DataProcessor in the pipeline. Again, not all DataProcessors have
 * predecessors.
 * <p>
 * Calling {@link #getData() getData}will return the processed Data object.
 */
public interface DataProcessor extends Configurable {
    /**
     * Initializes this DataProcessor. This is typically called after the
     * DataProcessor has been configured.
     * 
     */
    public void initialize();

    /**
     * Returns the processed Data output.
     * 
     * @return an Data object that has been processed by this DataProcessor
     * 
     * @throws DataProcessingException
     *                 if a data processor error occurs
     */
    public abstract Data getData() throws DataProcessingException;

    /**
     * Returns the name of this DataProcessor.
     * 
     * @return the name of this DataProcessor
     */
    public String getName();

    /**
     * Returns the predecessor DataProcessor.
     * 
     * @return the predecessor
     */
    public DataProcessor getPredecessor();

    /**
     * Sets the predecessor DataProcessor. This method allows dynamic
     * reconfiguration of the front end.
     * 
     * @param predecessor
     *                the new predecessor of this DataProcessor
     */
    public void setPredecessor(DataProcessor predecessor);
}