Bug 120215 BPS 40 - DE changes
1. all report elements' properties will be overidable with an expression. The binding expression will have access to report parameter, and static BIRT report objects only. 2) DE will provide api to get property binding expression for a given property on a report element handle. It's up to the engine to evaluate the property binding expression when the report gets executed. DE API changes -------------------------- a) DesignElementHandle will support the following two methods. - String (expression) GetPropertyBinding ( propertyName ) - void SetPropertyBinding( propertyName , String (expression) ) // Note get and set property methods are wrapper classes which actually use reportDesignHandle methods to retrive and set the property binding. b) rom.def changes Property bindings contains a list of binding expressions. ReportDesign element will be enhanced to support a new property called. <Property canInherit="false" detailType="propertyBinding" displayNameID="Element.Module.propertyBindings" isList="true" name="propertyBindings" type="structure"/> A new datatype - <Structure name="propertybinding"> <Member name="name" since="2.0" type="name"/> <Member name="id" returnType="any" since="2.0" type="string"/> // Use the unique id used to identify an element. <Member name="value" returnType="string" since="2.0" type="expression"/> </Structure>
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
* Semantic processing is done by doing a depth-first traversal of the design
 * tree. Errors are gathered on the design context.
 * <p>
 * The result of semantic processing may be that the design caches a reference
 * to another element as is done in this class for the parent element and the
 * shared style. In other cases, the reference is checked and then discarded.
 * <p>
 * When a reference is cached, the system must handle the case of a reference
 * that cannot be resolved. For example, an element might use a shared style
 * defined in a template, but that shared style has been deleted from the
 * template and can no longer be resolved. In this case, we cache the name until
 * the user loads the required elements, or changes the reference to an existing
 * style. Similar rules apply to the "extends" property.
 * 
 * @see ElementDefn
 * @see DesignElementHandle
 * @see ElementPropertyDefn
 */
public abstract class DesignElement
		implements
			IDesignElement,
			IPropertySet,
			IDesignElementModel
{
	/**
	 * The max length the display label for every element. If the length exceeds
	 * this limit, the exceeding part will be shown as "...".
	 */
	private static final int MAX_DISPLAY_LABEL_LEN = 30;
	/**