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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 java.util.List;

/**
 * @author kefir
 */
public class IfExpression extends AbstractTemplate implements ProcTemplateElement {
    /**
     * The name of checked variable
     */
    private final String name;

    public IfExpression(String name, List elements) {
        super(elements);
        this.name = name;
    }

    public CharSequence generate(Context context) {
        if (context.getLocalAttribute(name) != null) {
            StringBuilder b = new StringBuilder();
            for (ProcTemplateElement element : elements) {
                b.append(element.generate(context));
            }
            return b;
        } else {
            return "";
        }
    }
}