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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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| } |