com.ecfeed.core.model.ModelConverter Maven / Gradle / Ivy

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/*******************************************************************************
 *
 * Copyright (c) 2016 ecFeed AS.                                                
 * 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 
 *  
 *******************************************************************************/

package com.ecfeed.core.model;


public class ModelConverter {

	private static final String INVALID_MODEL_VERSION = "Invalid model version.";

	public static RootNode convertToCurrentVersion(RootNode model) throws ModelOperationException {
		int softwareVersion = ModelVersionDistributor.getCurrentSoftwareVersion();
		int modelVersion = model.getModelVersion();

		for (int version = modelVersion; version < softwareVersion; version++) {
			model = convertToNextVersion(model, version);
		}
		return model;
	}

	private static RootNode convertToNextVersion(RootNode model, int fromVersion) throws ModelOperationException {
		switch (fromVersion) {
		case 0:
			model = convertFrom0To1(model);
			break;
		case 1:
			model = convertFrom1To2(model);
			break;
		case 2:
			model = convertFrom2To3(model);
			break;
		default:
			ModelOperationException.report(INVALID_MODEL_VERSION); 
			break;
		}

		model.setVersion(fromVersion+1);
		return model;
	}

	private static RootNode convertFrom0To1(RootNode model) {
		// no changes in model internal structure, just serialization and parsing differs
	    return model;
	}

	private static RootNode convertFrom1To2(RootNode model) {
		// Flag of the ClassNode: RunOnAndroid moved to properties in ClassNode constructor.
		// Serializer in version 2 writes the RunOnAndroid flag to NodeProperties of the ClassNode. 
		return model;
	}

	private static RootNode convertFrom2To3(RootNode model) {
		// Relation types changed from symbols to text. The model is compatible backwards.
		return model;
	}
}