continuations/src/main/java/org/apache/struts2/continuations/ContinuationsExtraParameterProvider.java

/*
 * $Id: URL.java 474191 2006-11-13 08:30:40Z mrdon $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.struts2.continuations;

import java.util.Collections;
import java.util.Map;

import org.apache.struts2.components.URL.ExtraParameterProvider;

import com.opensymphony.xwork2.ActionContext;

/**
 * Injects the continuation id into the url parameters
 */
public class ContinuationsExtraParameterProvider implements ExtraParameterProvider {

    public Map getExtraParameters() {
        // tie in the continuation parameter
        String continueId = (String) ActionContext.getContext().get(StrutsContinuationConfig.CONTINUE_KEY);
        if (continueId != null) {
            return Collections.singletonMap(StrutsContinuationConfig.CONTINUE_PARAM, continueId);
        }
        return Collections.EMPTY_MAP;
    }

}