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/*******************************************************************************
* Copyright (c) 2010-2012, Zoltan Ujhelyi, Tamas Szabo, Peter Lunk, 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.databinding.runtime.adapter;
import java.util.Map;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.property.value.IValueProperty;
import org.eclipse.core.databinding.property.value.ValueProperty;
import org.eclipse.viatra.addon.databinding.runtime.api.ViatraObservables;
import org.eclipse.viatra.query.runtime.api.IPatternMatch;
import org.eclipse.viatra.query.runtime.api.IQuerySpecification;
import org.eclipse.viatra.query.runtime.matchers.util.Preconditions;
/**
*
*
* @author Peter Lunk
*
*/
public class MatcherProperties{
private static final String SOURCE_MUST_BE_A_PATTERN_MATCH = "Source must be a Pattern Match";
private MatcherProperties() {/*Utility class constructor*/}
/**
* Returns the array of observable values based on a VIATRA Query specification.
*
* @param The query specification
* @return the array of values
*/
public static String[] getPropertyNames(IQuerySpecification<?> query) {
Map<String, ObservableDefinition> parameterMap = ViatraObservables.calculateObservableValues(query);
return parameterMap.keySet().toArray(new String[parameterMap.keySet().size()]);
}
/**
* Returns an observable value for the given match and parameterName.
*
* @param query
* the query specification
* @param match
* the match object
* @param parameterName
* the parameter name
* @return an observable value
*/
public static IObservableValue getObservableValue(IQuerySpecification<?> query, IPatternMatch match, String parameterName) {
Map<String, ObservableDefinition> parameterMap = ViatraObservables.calculateObservableValues(query);
if (parameterMap.size() > 0) {
ObservableDefinition def = parameterMap.get(parameterName);
String expression = def.getExpression();
switch (def.getType()) {
case OBSERVABLE_FEATURE:
return ViatraObservables.getObservableValue(match, expression);
case OBSERVABLE_LABEL:
return ViatraObservables.getObservableLabelFeature(match, expression);
default:
return null;
}
}
return null;
}
/**
* Returns an IValueProperty for the given query specification and parameterName.
*
* @param query
* the query specification
* @param parameterName
* the parameter name
* @return a value property
*/
public static IValueProperty getValueProperty(IQuerySpecification<?> query, String parameterName) {
Map<String, ObservableDefinition> parameterMap = ViatraObservables.calculateObservableValues(query);
Preconditions.checkArgument(parameterMap.containsKey(parameterName), "Invalid parameter name");
ObservableDefinition def = parameterMap.get(parameterName);
switch (def.getType()) {
case OBSERVABLE_FEATURE:
return new MatcherProperty(def.getExpression());
case OBSERVABLE_LABEL:
return new MatcherLabelProperty(def.getExpression());
default:
return null;
}
}
protected static class MatcherProperty extends ValueProperty {
private String expression;
public MatcherProperty(String expression) {
this.expression = expression;
}
@Override
public Object getValueType() {
// XXX if typed as object, bindings are not displayed correctly
return null;
}
@Override
public IObservableValue observe(Realm realm, Object source) {
Preconditions.checkArgument((source instanceof IPatternMatch), SOURCE_MUST_BE_A_PATTERN_MATCH);
return ViatraObservables.getObservableValue((IPatternMatch) source, expression);
}
}
protected static class MatcherLabelProperty extends ValueProperty {
private String expression;
public MatcherLabelProperty(String expression) {
this.expression = expression;
}
@Override
public Object getValueType() {
return String.class;
}
@Override
public IObservableValue observe(Realm realm, Object source) {
Preconditions.checkArgument((source instanceof IPatternMatch), SOURCE_MUST_BE_A_PATTERN_MATCH);
return ViatraObservables.getObservableLabelFeature((IPatternMatch) source, expression);
}
}
}
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