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.model.ComponentModel;
021import org.apache.tapestry5.runtime.ComponentEvent;
022import org.slf4j.Logger;
023
024public class ComponentEventImpl extends EventImpl implements ComponentEvent
025{
026    private final String eventType;
027
028    private final String originatingComponentId;
029
030    private final EventContext context;
031
032    private final ComponentPageElementResources elementResources;
033
034    private final boolean exactParameterCountMatch;
035
036    /**
037     * @param eventType
038     *            non blank string used to identify the type of event that was triggered
039     * @param originatingComponentId
040     *            the id of the component that triggered the event
041     * @param context
042     *            provides access to parameter values
043     * @param handler
044     *            invoked when a non-null return value is obtained from an event handler method
045     * @param elementResources
046     *            provides access to common resources and services
047     * @param exactParameterCountMatch
048     *            the {@link org.apache.tapestry5.ioc.annotations.Symbol} indicating an exact match
049     *            on parameter count in the {@link EventContext}.
050     * @param model
051     *            the {@link ComponentModel} of the component originating the event.
052     * @param logger
053     *            used to log method invocations
054     */
055    public ComponentEventImpl(String eventType, String originatingComponentId, EventContext context,
056            ComponentEventCallback handler, ComponentPageElementResources elementResources,
057            boolean exactParameterCountMatch, ComponentModel model, Logger logger)
058    {
059        super(handler, logger, elementResources);
060
061        this.eventType = eventType;
062        this.originatingComponentId = originatingComponentId;
063        this.elementResources = elementResources;
064        this.context = context;
065        this.exactParameterCountMatch = exactParameterCountMatch && !model.handleActivationEventContext();
066    }
067
068    @Override
069    public String toString()
070    {
071        return String.format("ComponentEvent[%s from %s]", eventType, originatingComponentId.length() == 0 ? "(self)"
072                : originatingComponentId);
073    }
074
075    public boolean matches(String eventType, String componentId, int parameterCount)
076    {
077        if (isAborted())
078            return false;
079
080        boolean parameterCountMatch = exactParameterCountMatch ?
081                context.getCount() == parameterCount : context.getCount() >= parameterCount;
082
083        return this.eventType.equalsIgnoreCase(eventType) && parameterCountMatch
084                 && (originatingComponentId.equalsIgnoreCase(componentId) || componentId.equals(""));
085    }
086
087    @SuppressWarnings("unchecked")
088    public Object coerceContext(int index, String desiredTypeName)
089    {
090        if (index >= context.getCount())
091            throw new IllegalArgumentException(String.format("Method %s has more parameters than there are context values for this component event.", getMethodDescription()));
092        try
093        {
094            Class desiredType = elementResources.toClass(desiredTypeName);
095
096            return context.get(desiredType, index);
097        }
098        catch (Exception ex)
099        {
100            throw new IllegalArgumentException(String.format("Exception in method %s, parameter #%d: %s", getMethodDescription(), index + 1, ex), ex);
101        }
102    }
103
104    public Object[] getContext()
105    {
106        int count = context.getCount();
107
108        Object[] result = new Object[count];
109
110        for (int i = 0; i < count; i++)
111            result[i] = context.get(Object.class, i);
112
113        return result;
114    }
115
116    public EventContext getEventContext()
117    {
118        return context;
119    }
120}