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package org.apache.tapestry.binding; |
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import org.apache.hivemind.ApplicationRuntimeException; |
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import org.apache.hivemind.Location; |
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import org.apache.hivemind.util.Defense; |
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import org.apache.tapestry.coerce.ValueConverter; |
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import org.apache.tapestry.engine.state.ApplicationStateManager; |
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public class StateBinding extends AbstractBinding |
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{ |
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private final ApplicationStateManager _applicationStateManager; |
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private final String _objectName; |
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public StateBinding(String description, ValueConverter valueConverter, Location location, |
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ApplicationStateManager applicationStateManager, String objectName) |
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{ |
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super(description, valueConverter, location); |
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Defense.notNull(applicationStateManager, "applicationStateManager"); |
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Defense.notNull(objectName, "objectName"); |
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_applicationStateManager = applicationStateManager; |
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_objectName = objectName; |
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} |
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public boolean isInvariant() |
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{ |
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return false; |
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} |
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public Object getObject() |
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{ |
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try |
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{ |
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boolean exists = _applicationStateManager.exists(_objectName); |
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return exists ? Boolean.TRUE : Boolean.FALSE; |
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} |
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catch (Exception ex) |
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{ |
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throw new ApplicationRuntimeException(ex.getMessage(), getLocation(), ex); |
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} |
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} |
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} |