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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.proc;

import org.kefirsf.bb.conf.Function;

/**
 * Named value to build target text
 */
public class ProcNamedValue extends ProcNamedElement implements ProcTemplateElement {
    private Function function = Function.value;

    public ProcNamedValue(String name, Function function) {
        super(name);
        this.function = function;
    }

    /**
     * Добавляет элемент в новую строку
     *
     * @param context контекст
     */
    public CharSequence generate(Context context) {
        Object attribute = context.getAttribute(getName());
        if (attribute == null) {
            return "null";
        } else {
            CharSequence seq;
            if (attribute instanceof CharSequence) {
                seq = (CharSequence) attribute;
            } else {
                seq = attribute.toString();
            }

            if (function == Function.value) {
                return seq;
            } else {
                return String.valueOf(seq.length());
            }
        }
    }
}