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83 benjamin 1 
package org.tela_botanica.del.client.utils;
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/**
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 * {@code Observer} is the interface to be implemented by objects that receive
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 * notification of updates on an {@code Observable} object.
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 *
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 * @see GwtObservable
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 */
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public interface GwtObserver {
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	/**
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	 * This method is called if the specified {@code Observable} object's
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	 * {@code notifyObservers} method is called (because the {@code Observable}
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	 * object has been updated.
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	 *
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	 * @param observable
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	 *            the {@link GwtObservable} object.
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	 * @param data
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	 *            the data passed to
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	 *            {@link GwtObservable#notifyObservers(Object)}.
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	 */
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	void update(GwtObservable observable, Object data);
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}