OdaDataSourceAdapter.java from BIRT at Krugle

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/*
 *************************************************************************
 * Copyright (c) 2006 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *  
 *************************************************************************
 */ 
package org.eclipse.birt.report.data.adapter.internal.adapter;

import java.util.Iterator;
import java.util.Map;

import org.eclipse.birt.core.data.Constants;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.script.JavascriptEvalUtil;
import org.eclipse.birt.data.engine.api.querydefn.OdaDataSourceDesign;
import org.eclipse.birt.report.data.adapter.api.AdapterException;
import org.eclipse.birt.report.data.adapter.i18n.ResourceConstants;
import org.eclipse.birt.report.model.api.ExtendedPropertyHandle;
import org.eclipse.birt.report.model.api.OdaDataSourceHandle;
import org.mozilla.javascript.Scriptable;

/**
 * Adapts a Model ODA data source handle to equivalent DtE 
 * oda data source definition
 */
public class OdaDataSourceAdapter extends OdaDataSourceDesign
{
	private Scriptable bindingScope;
	
	/**
	 * Creates adaptor based on Model OdaDataSourceHandle.
	 * @param source model handle
	 * @param propBindingScope Javascript scope in which to evaluate property bindings. If null,
	 *   property bindings are not evaluated.
	 */
	public OdaDataSourceAdapter( OdaDataSourceHandle source, Scriptable propBindingScope) 
		throws BirtException
	{
		super(source.getQualifiedName());
		bindingScope = propBindingScope;

		// Adapt base class properties
		DataAdapterUtil.adaptBaseDataSource( source, this );

		// Adapt extended data source elements
		// validate that a required attribute is specified
		String driverName = source.getExtensionID( );
		if ( driverName == null || driverName.length( ) == 0 )
		{
			throw new AdapterException( ResourceConstants.DATASOURCE_EXID_ERROR,
					source.getName( ) );
		}
		setExtensionID( driverName );

		// static ROM properties defined by the ODA driver extension
		Map staticProps = DataAdapterUtil.getExtensionProperties( 
				source, source.getExtensionPropertyDefinitionList( ) );
		if ( staticProps != null && !staticProps.isEmpty( ) )
		{
			Iterator propNamesItr = staticProps.keySet( ).iterator( );
			while ( propNamesItr.hasNext( ) )
			{
				String propName = ( String ) propNamesItr.next( );
				assert ( propName != null );
	
				String propValue;
				// If property binding expression exists, use its evaluation
				// result
				String bindingExpr = source.getPropertyBinding( propName );
				if ( bindingScope != null && bindingExpr != null
						&& bindingExpr.length( ) > 0 )
				{
					propValue = JavascriptEvalUtil.evaluateScript( null, bindingScope, 
							bindingExpr, "property binding", 0 ).toString();
				} else
				{
					propValue = ( String ) staticProps.get( propName );
				}
				addPublicProperty( propName, propValue );
			}
		}

		// private driver properties / private runtime data
		Iterator elmtIter = source.privateDriverPropertiesIterator( );
		if ( elmtIter != null )
		{
			while ( elmtIter.hasNext( ) )
			{
				ExtendedPropertyHandle modelProp = ( ExtendedPropertyHandle ) elmtIter
						.next( );
				addPrivateProperty( modelProp.getName( ), modelProp
						.getValue( ) );
			}
		}
		
		// TODO: move ModeDteApiAdpter there in future
		addPropertyConfigurationId( this );
	}
	
	/**
	 * Adds the externalized property configuration id for use by 
	 * a BIRT consumer application's propertyProvider extension.
	 */
	private void addPropertyConfigurationId( OdaDataSourceDesign dteSource )
			throws BirtException
	{
		String configIdValue = dteSource.getExtensionID( )
				+ Constants.ODA_PROP_CONFIG_KEY_SEPARATOR + dteSource.getName( );
		dteSource.addPublicProperty( Constants.ODA_PROP_CONFIGURATION_ID,
				configIdValue );
	}
	
}
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