001// Copyright 2006, 2007, 2008, 2010, 2011 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.ComponentEventCallback;
018import org.apache.tapestry5.EventContext;
019import org.apache.tapestry5.internal.structure.ComponentPageElementResources;
020import org.apache.tapestry5.runtime.ComponentEvent;
021import org.slf4j.Logger;
022
023public class ComponentEventImpl extends EventImpl implements ComponentEvent
024{
025    private final String eventType;
026
027    private final String originatingComponentId;
028
029    private final EventContext context;
030
031    private final ComponentPageElementResources elementResources;
032
033    /**
034     * @param eventType
035     *            non blank string used to identify the type of event that was triggered
036     * @param originatingComponentId
037     *            the id of the component that triggered the event
038     * @param context
039     *            provides access to parameter values
040     * @param handler
041     *            invoked when a non-null return value is obtained from an event handler method
042     * @param elementResources
043     *            provides access to common resources and services
044     * @param logger
045     *            used to log method invocations
046     */
047    public ComponentEventImpl(String eventType, String originatingComponentId, EventContext context,
048            ComponentEventCallback handler, ComponentPageElementResources elementResources, Logger logger)
049    {
050        super(handler, logger, elementResources);
051
052        this.eventType = eventType;
053        this.originatingComponentId = originatingComponentId;
054        this.elementResources = elementResources;
055        this.context = context;
056    }
057
058    @Override
059    public String toString()
060    {
061        return String.format("ComponentEvent[%s from %s]", eventType, originatingComponentId.length() == 0 ? "(self)"
062                : originatingComponentId);
063    }
064
065    public boolean matches(String eventType, String componentId, int parameterCount)
066    {
067        if (isAborted())
068            return false;
069
070        return this.eventType.equalsIgnoreCase(eventType) && context.getCount() >= parameterCount
071                && (originatingComponentId.equalsIgnoreCase(componentId) || componentId.equals(""));
072    }
073
074    @SuppressWarnings("unchecked")
075    public Object coerceContext(int index, String desiredTypeName)
076    {
077        if (index >= context.getCount())
078            throw new IllegalArgumentException(ServicesMessages.contextIndexOutOfRange(getMethodDescription()));
079        try
080        {
081            Class desiredType = elementResources.toClass(desiredTypeName);
082
083            return context.get(desiredType, index);
084        }
085        catch (Exception ex)
086        {
087            throw new IllegalArgumentException(ServicesMessages.exceptionInMethodParameter(getMethodDescription(),
088                    index, ex), ex);
089        }
090    }
091
092    public Object[] getContext()
093    {
094        int count = context.getCount();
095
096        Object[] result = new Object[count];
097
098        for (int i = 0; i < count; i++)
099            result[i] = context.get(Object.class, i);
100
101        return result;
102    }
103
104    public EventContext getEventContext()
105    {
106        return context;
107    }
108}