ELResolver

あっているかどうか分からないので、晒してみようと思います。

• WebworkELResolver.java

package webwork.resolver;
import java.util.Iterator;
import javax.el.ELContext;

import javax.el.ELException;

import javax.el.ELResolver;

import javax.el.PropertyNotFoundException;

import javax.el.PropertyNotWritableException;
import org.seasar.maya.engine.Engine;

import org.seasar.maya.engine.Page;

import org.seasar.maya.engine.Template;

import org.seasar.maya.engine.specification.PageSpecification;
import com.opensymphony.xwork.ActionContext;

import com.opensymphony.xwork.ActionInvocation;

import com.opensymphony.xwork.util.OgnlValueStack;
/**

 * @author duran

 *  

 */

public class WebworkELResolver extends ELResolver {
    public Object getValue(ELContext context, Object base, Object property)

            throws NullPointerException, PropertyNotFoundException, ELException {

        if (context == null) {

            throw new NullPointerException();

        }
        if (base == null && property != null) {

            PageSpecification specification = getSpecification(context);

            if (specification == null) {

                return null;

            }

            String name = property.toString();
            if (name.equals("action")) {

                OgnlValueStack stack = ActionContext.getContext()

                        .getValueStack();

                ActionInvocation invocation = (ActionInvocation) stack

                        .getContext().get(ActionContext.ACTION_INVOCATION);
                if (invocation != null) {

                    context.setPropertyResolved(true);

                    return invocation.getAction();

                }

            }

        }

        return null;

    }
    public Class getType(ELContext context, Object base, Object property)

            throws NullPointerException, PropertyNotFoundException, ELException {

        if (context == null) {

            throw new NullPointerException();

        }

        if (base == null && property != null) {

            PageSpecification specification = getSpecification(context);

            if (specification == null) {

                return null;

            }

            String name = property.toString();

            if (name.equals("action")) {

                OgnlValueStack stack = ActionContext.getContext()

                        .getValueStack();

                ActionInvocation invocation = (ActionInvocation) stack

                        .getContext().get(ActionContext.ACTION_INVOCATION);
                if (invocation != null) {

                    context.setPropertyResolved(true);

                    return invocation.getAction().getClass();

                }

            }
        }

        return null;

    }
    protected PageSpecification getSpecification(ELContext context) {

        PageSpecification specification = null;

        Template template = (Template) context.getContext(Template.class);

        if (template != null) {

            specification = template.getLocalSpecification();

        } else {

            Page page = (Page) context.getContext(Page.class);

            if (page != null) {

                specification = page.getPageSpecification();

            } else {

                Engine engine = (Engine) context.getContext(Engine.class);

                if (engine != null) {

                    specification = engine.getDefaultSpecification();

                }

            }

        }

        return specification;

    }
    public void setValue(ELContext context, Object base, Object property,

            Object value) throws NullPointerException,

            PropertyNotFoundException, PropertyNotWritableException,

            ELException {

    }
    public boolean isReadOnly(ELContext context, Object base, Object property)

            throws NullPointerException, PropertyNotFoundException, ELException {

        return true;

    }
    public Iterator getFeatureDescriptors(ELContext context, Object base) {

        return null;

    }
    public Class getCommonPropertyType(ELContext context, Object base) {

        return Object.class;

    }
}

EL式の中に「action」という文字があった場合にActionを返すようにしています。getValueメソッド以外は動作しているかどうか分かりません・・・

追記
getSpecificationは必要ないので削除しました。
context.setPropertyResolved(true);の位置を変更しました。

このELResolverを登録するためのサーブレット

• WebworkMayaServlet.java

package webwork.servlet;
import javax.servlet.ServletException;

import javax.servlet.jsp.JspApplicationContext;
import org.seasar.maya.standard.MayaServlet;

import org.seasar.maya.util.EngineUtil;
import webwork.resolver.WebworkELResolver;
/**

 * @author duran

 *  

 */

public class WebworkMayaServlet extends MayaServlet {

    public void init() throws ServletException {

        super.init();
        JspApplicationContext jspApplication = EngineUtil

                .getJspApplicationContext(getServletContext());
        jspApplication.addELResolver(new WebworkELResolver());
    }

}

このサーブレットをMayaSevletの代わりにweb.xmlに登録します。

とりあえずこの実装で動作を確認することはできました。