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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;

import org.kefirsf.bb.conf.Constant;
import org.kefirsf.bb.conf.If;
import org.kefirsf.bb.conf.NamedValue;
import org.kefirsf.bb.conf.TemplateElement;
import org.kefirsf.bb.proc.IfExpression;
import org.kefirsf.bb.proc.ProcNamedValue;
import org.kefirsf.bb.proc.ProcTemplateElement;
import org.kefirsf.bb.proc.TemplateConstant;

import java.util.ArrayList;
import java.util.List;

class TemplateElementFactory {
    public TemplateElementFactory() {
    }

    List createTemplateList(List templateElements) {
        List elements = new ArrayList();
        for (TemplateElement element : templateElements) {
            elements.add(create(element));
        }
        return elements;
    }

    private ProcTemplateElement create(TemplateElement element) {
        if (element instanceof Constant) {
            return new TemplateConstant(((Constant) element).getValue());
        } else if (element instanceof NamedValue) {
            NamedValue el = (NamedValue) element;
            return new ProcNamedValue(el.getName(), el.getFunction());
        } else if (element instanceof If) {
            return createIf((If) element);
        } else {
            throw new TextProcessorFactoryException("Unknown template element " + element.getClass().getName() + ".");
        }
    }

    private ProcTemplateElement createIf(If element) {
        return new IfExpression(element.getName(), createTemplateList(element.getElements()));
    }
}