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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
* 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:
* Remi Schnekenburger (CEA LIST) remi.schnekenburger@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.queries.core.converter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.databinding.conversion.IConverter;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.papyrus.infra.queries.core.Activator;
import org.eclipse.papyrus.infra.queries.core.configuration.ConstantParameterValue;
import org.eclipse.papyrus.infra.queries.core.configuration.ListParameterValue;
import org.eclipse.papyrus.infra.queries.core.configuration.ModiscoQueryConfiguration;
import org.eclipse.papyrus.infra.queries.core.configuration.ParameterValue;
import org.eclipse.papyrus.infra.queries.core.configuration.QueryConfiguration;
import org.eclipse.papyrus.infra.queries.core.configuration.QueryExecutionValue;
import org.eclipse.papyrus.infra.queries.core.configuration.util.ConfigurationSwitch;
import org.eclipse.papyrus.infra.queries.core.modisco.QueryUtil;
import org.eclipse.uml2.uml.ValueSpecification;
/**
* Registry to store converters.
*/
public class ConverterRegistry {
/** singleton instance */
private static ConverterRegistry instance;
/** map to store converters, identified by their class */
private Map<Class<?>, IConverter> converterMaps = new HashMap<Class<?>, IConverter>();
/**
* Constructor (not visible: singleton pattern)
*/
private ConverterRegistry() {
}
/**
* Returns the single instance of this registry
*
* @return the single instance of this registry
*/
public static synchronized ConverterRegistry getSingleton() {
if(instance == null) {
instance = new ConverterRegistry();
instance.initializeRegistry();
}
return instance;
}
/**
* Initialize the registry
*/
protected void initializeRegistry() {
converterMaps.put(String.class, new ValueSpecificationToStringConverter());
converterMaps.put(int.class, new ValueSpecificationToIntegerConverter());
converterMaps.put(boolean.class, new ValueSpecificationToBooleanConverter());
}
/**
* Returns the converter for the convenient type, from an {@link Object}
*
* @param toType
* the class into which the element should be transformed
*
* @return the converter for the convenient type
*/
public IConverter getConverter(Class<?> toType) {
return converterMaps.get(toType);
}
public Object convert(Class<?> parameterType, ValueSpecification valueInstance) throws ConverterNotfoundException {
// retrieve the converter
IConverter converter = getConverter(parameterType);
if(converter != null) {
return converter.convert(valueInstance);
} else {
throw new ConverterNotfoundException(parameterType, valueInstance);
}
}
/**
* Converts a parameter value into a list of values
*
* @param context
* the context of the evaluation of the query
* @param parameterType
* the type of the list
* @param parameterValue
* the parameter value to transform into a list
* @return the list of values contained by the parameter value
*/
public List<?> convertToList(final EObject context, final Class<?> parameterType, final ParameterValue parameterValue) {
return new ConfigurationSwitch<List<?>>() {
/**
* {@inheritDoc}
*/
@Override
public java.util.List<?> caseConstantParameterValue(ConstantParameterValue constantParameterValue) {
IConverter converter = getConverter(parameterType);
if(converter != null) {
return Arrays.asList(converter.convert(constantParameterValue.getValueInstance()));
} else {
Activator.log.error("Impossible to find a converter for type: " + parameterType, null);
return Collections.emptyList();
}
};
/**
* {@inheritDoc}
*/
@Override
public java.util.List<?> caseQueryExecutionValue(QueryExecutionValue queryExecutionValue) {
// if query returns a list, returns it, else creates an array of one element
QueryConfiguration queryConfiguration = queryExecutionValue.getConfiguration();
if(!(queryConfiguration instanceof ModiscoQueryConfiguration)) {
throw new RuntimeException("List conversion not implemented for this type of configuration. " + queryConfiguration.eClass().getName());
}
Object executionResult = null;
// try {
// executionResult = QueryUtil.evaluateBooleanQuery(context, queryConfiguration);
// } catch (Exception e) {
// Activator.log.error(e);
// }
// int upperBound = ((ModiscoQueryConfiguration)queryConfiguration).getQuery().getUpperBound();
// if(upperBound == 1) {
// return Arrays.asList(executionResult);
// } else {
return (List<?>)executionResult;
// }
};
/**
* {@inheritDoc}
*/
@Override
public java.util.List<?> caseListParameterValue(ListParameterValue listParameterValue) {
List<Object> values = new ArrayList<Object>();
for(ParameterValue parameterValue : listParameterValue.getValues()) {
values.addAll(convertToList(context, parameterType, parameterValue));
}
return values;
};
}.doSwitch(parameterValue);
}
}
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