package com.googlecode.struts2yuiplugin.components;



import com.opensymphony.xwork2.util.ValueStack;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.struts2.views.annotations.StrutsTag;

import org.apache.struts2.views.annotations.StrutsTagAttribute;



import java.io.Writer;



/**

 * The model for a Tab in a YUI TabView

 */

@StrutsTag(name = "tab", tldTagClass = "com.googlecode.struts2yuiplugin.views.jsp.ui.TabTag", description = "Renders a Tab in a YUI TabView")

public class Tab extends ClosingYUIBean implements OGNLEvaluator {



    private static final String OPEN_TEMPLATE = "yuitab";

    private static final String TEMPLATE = OPEN_TEMPLATE +"-close";



    private boolean selected;



    public Tab(ValueStack valueStack, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {

        super(valueStack, httpServletRequest, httpServletResponse);

    }



    @Override

    public void evaluateParams() {

        super.evaluateParams();



        addParameter("selected", selected);

    }



    public String getDefaultOpenTemplate() {

        return OPEN_TEMPLATE;

    }



    protected String getDefaultTemplate() {

        return TEMPLATE;

    }



    /**

     * Evaluates the OGNL expression

     *

     * @param expr OGNL expression.

     * @return the String value found.

     */

    public String evaluateExpression(String expr) {

        return super.findString(expr);

    }



    @Override

    public boolean start(Writer writer) {

        return true; // evaluate body

    }



    /** This component uses the body so it needs to be buffered */

    @Override

    public boolean usesBody() {

        return true;

    }



    /** There is no template merging and don't write to output */

    @Override

    public boolean end(Writer writer, String body) {

        evaluateParams();

        parameters.put("body", body);

        popComponentStack();

        return false;  // don't evaluate body again

    }



    public String getBody() {

        return (String) parameters.get("body");

    }



    public String getId() {

        return (String) parameters.get("id");

    }



    public String getLabel() {

        return (String) parameters.get("label");

    }



    public boolean isSelected() {

        return selected;

    }



    public String getCssClass() {

        return (String) parameters.get("cssClass");

    }



    @Override

    @StrutsTagAttribute(description = "HTML id attribute", required = true, rtexprvalue = true)

    public void setId(String id) {

        super.setId(id);

    }



    @Override

    @StrutsTagAttribute(description = "Label expression used for rendering a element specific label", required = true)

    public void setLabel(String label) {

        super.setLabel(label);

    }



    @StrutsTagAttribute(description = "Identifies a tab that is initially selected", required = false)

    public void setSelected(boolean selected) {

        this.selected = selected;

    }

}