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| package org.apache.tapestry.record; |
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| |
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| import java.util.Collection; |
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| import java.util.Iterator; |
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| |
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| import org.apache.hivemind.ApplicationRuntimeException; |
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| import org.apache.hivemind.ErrorLog; |
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| import org.apache.hivemind.util.Defense; |
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| import org.apache.hivemind.util.PropertyUtils; |
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| import org.apache.tapestry.IComponent; |
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| import org.apache.tapestry.IPage; |
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| import org.apache.tapestry.IRequestCycle; |
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| import org.apache.tapestry.engine.IPageRecorder; |
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| import org.apache.tapestry.event.ObservedChangeEvent; |
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| import org.apache.tapestry.spec.IPropertySpecification; |
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| |
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| |
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| public class PageRecorderImpl implements IPageRecorder |
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| { |
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| private String _pageName; |
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| |
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| private IRequestCycle _requestCycle; |
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| |
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| private PropertyPersistenceStrategySource _strategySource; |
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| |
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| private boolean _locked = false; |
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| |
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| private ErrorLog _log; |
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| |
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| public PageRecorderImpl(String pageName, IRequestCycle requestCycle,
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| PropertyPersistenceStrategySource strategySource, ErrorLog log) |
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| { |
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| Defense.notNull(pageName, "pageName");
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| Defense.notNull(requestCycle, "requestCycle");
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| Defense.notNull(strategySource, "strategySource");
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| Defense.notNull(log, "log");
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| |
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| _pageName = pageName;
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| _requestCycle = requestCycle;
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| _strategySource = strategySource;
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| _log = log;
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| } |
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| |
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| public void commit()
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| { |
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| _locked = true;
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| } |
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| |
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| public Collection getChanges()
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| { |
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| return _strategySource.getAllStoredChanges(_pageName, _requestCycle);
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| } |
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| |
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| public void rollback(IPage page)
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| { |
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| Collection changes = getChanges();
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| Iterator i = changes.iterator();
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| while (i.hasNext())
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| { |
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| PropertyChange change = (PropertyChange) i.next();
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| |
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| applyChange(page, change);
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| } |
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| } |
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| |
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| private void applyChange(IPage page, PropertyChange change)
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| { |
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| String idPath = change.getComponentPath();
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| IComponent component = (idPath == null) ? page : page.getNestedComponent(idPath);
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| PropertyUtils.write(component, change.getPropertyName(), change.getNewValue());
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| } |
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| public void observeChange(ObservedChangeEvent event)
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| { |
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| IComponent component = event.getComponent();
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| String propertyName = event.getPropertyName();
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| if (_locked)
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| { |
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| _log.error(RecordMessages.recorderLocked(propertyName, component), null, null);
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| return;
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| } |
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| |
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| PropertyPersistenceStrategy strategy = findStrategy(component, propertyName);
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| |
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| if (strategy != null)
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| strategy.store(_pageName, component.getIdPath(), propertyName, event.getNewValue());
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| } |
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| PropertyPersistenceStrategy findStrategy(IComponent component, String propertyName)
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| { |
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| IPropertySpecification propertySpecification = component.getSpecification()
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| .getPropertySpecification(propertyName); |
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| |
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| if (propertySpecification == null)
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| { |
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| _log.error(
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| RecordMessages.missingPropertySpecification(propertyName, component), |
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| null, |
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| null); |
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| return null;
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| } |
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| String name = propertySpecification.getPersistence();
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| try
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| { |
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| return _strategySource.getStrategy(name);
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| } |
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| catch (ApplicationRuntimeException ex) |
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| { |
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| _log.error(ex.getMessage(), propertySpecification.getLocation(), ex);
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| return null;
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| } |
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| } |
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| |
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| } |