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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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44 | 0 | private final Map _listeners = new HashMap(); |
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public ListenerMapImpl(Object target, Map invokers) |
47 | 0 | { |
48 | 0 | Defense.notNull(target, "target"); |
49 | 0 | Defense.notNull(invokers, "invokers"); |
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51 | 0 | _target = target; |
52 | 0 | _invokers = invokers; |
53 | 0 | } |
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public boolean canProvideListener(String name) |
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{ |
57 | 0 | return _invokers.containsKey(name); |
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} |
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public synchronized IActionListener getListener(String name) |
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{ |
62 | 0 | IActionListener result = (IActionListener) _listeners.get(name); |
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64 | 0 | if (result == null) |
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{ |
66 | 0 | result = createListener(name); |
67 | 0 | _listeners.put(name, result); |
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} |
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70 | 0 | 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; |
76 | 0 | String generatedName = "do" + TapestryUtils.capitalize(component.getId()); |
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try |
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{ |
79 | 0 | listener = getListener(generatedName); |
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} |
81 | 0 | catch (ApplicationRuntimeException e) |
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{ |
83 | 0 | throw new ApplicationRuntimeException(ListenerMessages.noImplicitListenerMethodFound(generatedName, component), component, null, e); |
84 | 0 | } |
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86 | 0 | return listener; |
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} |
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private IActionListener createListener(String name) |
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{ |
91 | 0 | ListenerMethodInvoker invoker = (ListenerMethodInvoker) _invokers.get(name); |
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93 | 0 | if (invoker == null) |
94 | 0 | throw new ApplicationRuntimeException(ListenerMessages.objectMissingMethod(_target, name), |
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_target, null, null); |
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97 | 0 | return new SyntheticListener(_target, invoker); |
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} |
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public Collection getListenerNames() |
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{ |
102 | 0 | return Collections.unmodifiableCollection(_invokers.keySet()); |
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} |
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} |