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/*****************************************************************************
* Copyright (c) 2016 Christian W. Damus and others.
*
* 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.m2m.qvto;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.m2m.internal.qvt.oml.trace.EValue;
import org.eclipse.m2m.internal.qvt.oml.trace.Trace;
import org.eclipse.m2m.internal.qvt.oml.trace.TraceRecord;
import org.eclipse.m2m.internal.qvt.oml.trace.VarParameterValue;
import org.eclipse.m2m.qvt.oml.ExecutionContext;
import org.eclipse.m2m.qvt.oml.blackbox.java.Operation;
import org.eclipse.m2m.qvt.oml.blackbox.java.Operation.Kind;
import org.eclipse.m2m.qvt.oml.util.IContext;
import org.eclipse.m2m.qvt.oml.util.ISessionData;
/**
* Query operations that introspect the trace model.
*/
@SuppressWarnings("restriction")
public class TraceHelper {
/**
* QVTo {@link ExecutionContext} session data key for the cumulative trace history.
* This is distinct from the session data for incremental update traces because it
* is not used for incremental update, but as a "memory" of trace relationships
* established by past transformations.
*/
public static ISessionData.SimpleEntry<org.eclipse.m2m.qvt.oml.util.Trace> TRACE_HISTORY = new ISessionData.SimpleEntry<org.eclipse.m2m.qvt.oml.util.Trace>();
private final Map<String, EClass> eclasses = new HashMap<String, EClass>();
/**
* Initializes me.
*/
public TraceHelper() {
super();
}
/**
* Gets the source object from which a given {@code self} object traces.
*
* @param context
* the execution context
* @param self
* the object for which to trace its original in the source model
*
* @return
* the source object, or {@code null} if not found in the traces
*/
@Operation(contextual = true, kind = Kind.QUERY, withExecutionContext = true)
public Object traceFrom(IContext context, Object self) {
return traceFrom(context, self, null);
}
/**
* Gets the source object from which a given {@code self} object traces.
*
* @param context
* the execution context
* @param self
* the object for which to trace its original in the source model
* @param type
* the type of source object to obtain, in case multiple sources
* map to the same target (may be {@code null} to get any source)
*
* @return
* the source object, or {@code null} if not found in the traces
*/
@Operation(contextual = true, kind = Kind.QUERY, withExecutionContext = true)
public Object traceFrom(IContext context, Object self, String type) {
EObject result = null;
org.eclipse.m2m.qvt.oml.util.Trace history = context.getSessionData().getValue(TRACE_HISTORY);
List<EObject> traces = (history != null) ? history.getTraceContent() : Collections.<EObject> emptyList();
for (EObject next : traces) {
if (next instanceof Trace) {
Trace trace = (Trace) next;
EList<TraceRecord> inverse = trace.getTargetToTraceRecordMap().get(self);
if (inverse != null) {
for (TraceRecord record : inverse) {
VarParameterValue source = record.getContext().getContext();
EValue sourceValue = (source == null) ? null : source.getValue();
EObject sourceElement = (sourceValue == null) ? null : sourceValue.getModelElement();
if ((sourceElement != null) && ((type == null) || isA(sourceElement.eClass(), type))) {
result = sourceElement;
break;
}
}
}
}
}
return result;
}
private boolean isA(EClass eclass, String type) {
boolean result;
EClass target = eclasses.get(type);
if (target != null) {
result = target.isSuperTypeOf(eclass);
} else {
result = __isA(eclass, type);
}
return result;
}
private boolean __isA(EClass eclass, String type) {
boolean result;
String qname = qname(eclass);
result = qname.equals(type);
if (!result) {
for (EClass next : eclass.getESuperTypes()) {
result = isA(next, type);
if (result) {
break;
}
}
}
return result;
}
private String qname(EClass eclass) {
StringBuilder buf = new StringBuilder();
buf.append(eclass.getEPackage().getName());
buf.append("::"); //$NON-NLS-1$
buf.append(eclass.getName());
for (EPackage nesting = eclass.getEPackage().getESuperPackage(); nesting != null; nesting = nesting.getESuperPackage()) {
buf.insert(0, "::"); //$NON-NLS-1$
buf.insert(0, nesting.getName());
}
String result = buf.toString();
eclasses.put(result, eclass);
return result;
}
}
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