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KefirBB is a Java-library for text processing. Initially it was developed for BB2HTML translation. But flexible configuration allows to use it in different cases. For example for parsing Markdown, Textile, and for HTML filtration.

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package org.kefirsf.bb;

/**
 * Text Processor adapter implement methods for String, StringBuffer, StringBuilder
 *
 * @author Vitaliy Samolovskih aka Kefir
 */
public abstract class TextProcessorAdapter implements TextProcessor {
    /**
     * Process the text
     *
     * @param source the sourcetext
     * @return the result of text processing
     */
    public String process(String source) {
        CharSequence result = process((CharSequence) source);
        if (result instanceof String) {
            return (String) result;
        } else {
            return result.toString();
        }
    }

    /**
     * Process the text
     *
     * @param source the sourcetext
     * @return the result of text processing
     */
    public StringBuilder process(StringBuilder source) {
        CharSequence result = process((CharSequence) source);
        if (result instanceof StringBuilder) {
            return (StringBuilder) result;
        } else {
            return new StringBuilder(result);
        }
    }

    /**
     * Process the text
     *
     * @param source the sourcetext
     * @return the result of text processing
     */
    public StringBuffer process(StringBuffer source) {
        CharSequence result = process((CharSequence) source);
        if (result instanceof StringBuffer) {
            return (StringBuffer) result;
        } else {
            return new StringBuffer(result);
        }
    }
}