AbstractHomepageTag.java

package org.genedb.web.tags.db;

import static javax.servlet.jsp.PageContext.APPLICATION_SCOPE;
import static org.genedb.web.mvc.controller.TaxonManagerListener.TAXON_NODE_MANAGER;

import org.genedb.db.taxon.TaxonNode;
import org.genedb.db.taxon.TaxonNodeManager;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.SimpleTagSupport;

public abstract class AbstractHomepageTag extends SimpleTagSupport {

    private static final String DEFAULT_TOP = "Root";
    private String top = DEFAULT_TOP;


    @Override
    public void doTag() throws JspException, IOException {
        TaxonNodeManager tnm = (TaxonNodeManager)
            getJspContext().getAttribute(TAXON_NODE_MANAGER, APPLICATION_SCOPE);

        TaxonNode topNode = tnm.getTaxonNodeForLabel(top);

        if (topNode == null) {
            throw new JspException("Homepage Tag: Can't identify taxonNode for '"+top+"'");
        }

        display(topNode, getJspContext().getOut());
    }

    abstract protected void display(TaxonNode node, JspWriter out) throws IOException;

    public void setTop(String top) {
        this.top = top;
    }

}