// Copyright 2010 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry5.services;

import java.io.IOException;

import org.apache.tapestry5.http.services.RequestGlobals;

/**
 * Filter contributed into the {@link ComponentRequestHandler} pipeline to set the
 * {@link RequestGlobals#getActivePageName() activePageName property}.
 * 
 * @since 5.2.0
 */
public class InitializeActivePageName implements ComponentRequestFilter
{
    private final RequestGlobals globals;

    public InitializeActivePageName(RequestGlobals globals)
    {
        this.globals = globals;
    }

    public void handleComponentEvent(ComponentEventRequestParameters parameters,
            ComponentRequestHandler handler) throws IOException
    {
        globals.storeActivePageName(parameters.getActivePageName());

        handler.handleComponentEvent(parameters);
    }

    public void handlePageRender(PageRenderRequestParameters parameters,
            ComponentRequestHandler handler) throws IOException
    {
        globals.storeActivePageName(parameters.getLogicalPageName());

        handler.handlePageRender(parameters);
    }

}
