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/*
 * 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.action.impl;

import javax.annotation.Nonnull;

import org.opensaml.profile.action.AbstractProfileAction;
import org.opensaml.profile.context.EventContext;
import org.opensaml.profile.context.ProfileRequestContext;
import org.opensaml.profile.context.navigate.CurrentOrPreviousEventLookup;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Function;

import net.shibboleth.utilities.java.support.component.ComponentSupport;
import net.shibboleth.utilities.java.support.logic.Constraint;


/**
 * A profile action that logs an event if one is found in the profile request context.
 * 
 * @param  input message type
 * @param  output message type
 * 
 * @event {@link org.opensaml.profile.action.EventIds#PROCEED_EVENT_ID}
 */
public class LogEvent extends AbstractProfileAction {
    
    /** Class logger. */
    @Nonnull private final Logger log = LoggerFactory.getLogger(LogEvent.class);

    /** Strategy function for access to {@link EventContext} to check. */
    @Nonnull private Function eventContextLookupStrategy;
    
    /** Constructor. */
    public LogEvent() {
        eventContextLookupStrategy = new CurrentOrPreviousEventLookup();
    }

    /**
     * Set lookup strategy for {@link EventContext} to check.
     * 
     * @param strategy  lookup strategy
     */
    public void setEventContextLookupStrategy(@Nonnull final Function strategy) {
        ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
        
        eventContextLookupStrategy = Constraint.isNotNull(strategy, "EventContext lookup strategy cannot be null");
    }
    
    /** {@inheritDoc} */
    @Override
    protected void doExecute(@Nonnull final ProfileRequestContext profileRequestContext) {
        
        final EventContext eventCtx = eventContextLookupStrategy.apply(profileRequestContext);
        if (eventCtx == null || eventCtx.getEvent() == null) {
            return;
        }
        
        log.warn("An error event occurred while processing the request: {}", eventCtx.getEvent().toString());
    }
    
}