addon/plugins/org.eclipse.viatra.addon.validation.core/src/org/eclipse/viatra/addon/validation/core/ValidationEngineBuilder.java

/*******************************************************************************
 * Copyright (c) 2010-2014, Abel Hegedus, Istvan Rath and Daniel Varro
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-v20.html.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *******************************************************************************/
package org.eclipse.viatra.addon.validation.core;

import org.apache.log4j.Logger;
import org.eclipse.viatra.addon.validation.core.api.IValidationEngine;
import org.eclipse.viatra.query.runtime.api.ViatraQueryEngine;
import org.eclipse.viatra.query.runtime.matchers.util.Preconditions;
import org.eclipse.viatra.query.runtime.util.ViatraQueryLoggingUtil;

/**
 * 
 * Builder for {@link ValidationEngine} objects.
 * 
 * @author Abel Hegedus
 *
 */
public class ValidationEngineBuilder {

    private ViatraQueryEngine queryEngine = null;
    private Logger logger = null;

    protected ValidationEngineBuilder() {
        
    }
    
    /**
     * @return a new builder to setup validation engines
     */
    public static ValidationEngineBuilder create(){
        
        return new ValidationEngineBuilder();
        
    }
    
    /**
     * Prepares a new {@link ValidationEngine} using the configured parameters.
     * 
     * @return an uninitialized validation engine
     * @throws IllegalStateException if the {@link ViatraQueryEngine} for the
     *   new validation engine cannot be determined
     */
    public IValidationEngine build() {
        Preconditions.checkState(queryEngine != null, "Must initialize engine before building!");
        if(logger == null){
            logger = ViatraQueryLoggingUtil.getLogger(ValidationEngine.class);
        }
        Preconditions.checkState(logger != null, "Must initialize logger before building!");
        return new ValidationEngine(queryEngine, logger);
    }
    
    public ValidationEngineBuilder setEngine(ViatraQueryEngine engine) {
        Preconditions.checkArgument(engine != null, "Engine cannot be null!");
        this.queryEngine = engine;
        return this;
    }
    
    public ValidationEngineBuilder setLogger(Logger logger) {
        this.logger = logger;
        return this;
    }
    
    
    
}