org.opensaml.profile.context.navigate.CurrentOrPreviousEventLookup Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of opensaml-profile-api Show documentation

There is a newer version: 4.0.1

/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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.opensaml.profile.context.navigate;

import javax.annotation.Nullable;

import org.opensaml.profile.context.EventContext;
import org.opensaml.profile.context.PreviousEventContext;
import org.opensaml.profile.context.ProfileRequestContext;

import com.google.common.base.Function;

/** Access either current or previous event from context tree. */
public class CurrentOrPreviousEventLookup implements Function {

    /** {@inheritDoc} */
    @Override
    @Nullable public EventContext apply(@Nullable final ProfileRequestContext input) {
        if (input != null) {
            final EventContext eventCtx = input.getSubcontext(EventContext.class);
            if (eventCtx != null && eventCtx.getEvent() != null) {
                return eventCtx;
            } else {
                return input.getSubcontext(PreviousEventContext.class);
            }
        } else {
            return null;
        }
    }
    
}