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package org.apache.tapestry.listener; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.Map; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.hivemind.util.Defense; |
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import org.apache.tapestry.IActionListener; |
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import org.apache.tapestry.IComponent; |
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import org.apache.tapestry.TapestryUtils; |
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public class ListenerMapImpl implements ListenerMap |
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{ |
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private final Object _target; |
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private final Map _invokers; |
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private final Map _listeners = new HashMap(); |
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public ListenerMapImpl(Object target, Map invokers) |
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{ |
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Defense.notNull(target, "target"); |
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Defense.notNull(invokers, "invokers"); |
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_target = target; |
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_invokers = invokers; |
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} |
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public boolean canProvideListener(String name) |
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{ |
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return _invokers.containsKey(name); |
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} |
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public synchronized IActionListener getListener(String name) |
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{ |
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IActionListener result = (IActionListener) _listeners.get(name); |
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if (result == null) |
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{ |
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result = createListener(name); |
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_listeners.put(name, result); |
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} |
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return result; |
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} |
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public IActionListener getImplicitListener(IComponent component) |
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{ |
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IActionListener listener; |
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String generatedName = "do" + TapestryUtils.capitalize(component.getId()); |
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try |
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{ |
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listener = getListener(generatedName); |
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} |
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catch (ApplicationRuntimeException e) |
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{ |
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throw new ApplicationRuntimeException(ListenerMessages.noImplicitListenerMethodFound(generatedName, component), component, null, e); |
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} |
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return listener; |
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} |
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private IActionListener createListener(String name) |
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{ |
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ListenerMethodInvoker invoker = (ListenerMethodInvoker) _invokers.get(name); |
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if (invoker == null) |
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throw new ApplicationRuntimeException(ListenerMessages.objectMissingMethod(_target, name), |
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_target, null, null); |
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return new SyntheticListener(_target, invoker); |
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} |
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public Collection getListenerNames() |
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{ |
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return Collections.unmodifiableCollection(_invokers.keySet()); |
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} |
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} |