Substitutable.java

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package com.sun.enterprise.admin.servermgmt.stringsubs;

import java.io.Reader;
import java.io.Writer;

/**
 * Defines the creation of {@link Reader} & {@link Writer} for a file
 * on which string substitution has to be performed.
 */
public interface Substitutable {
    /**
     * Gets the processing entity name on which string substitution
     * operation is carrying on.
     *
     * @return Name of the entity. 
     */
    String getName();

    /**
     * Gets the character stream from the input.
     * <p> Implementation note: It is a good idea for the input
     * stream to be buffered.</p>
     *
     * @return  A Reader.
     */
    Reader getReader();

    /**
     * Gets the {@link Writer} object to write the character stream in to 
     * the output.
     * <p> Implementation note: It is a good idea for the output
     * stream to be buffered.</p>
     *
     * @return  A Writer.
     */
    Writer getWriter();

    /**
     * Called at the completion of the substitution process to perform
     * post operation. For e.g closing of reader/writer, cleaning of the
     * temporary data... etc.
     */
    void finish();
}