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/*
* SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.model.internal;
import tools.refinery.store.adapter.AdapterUtils;
import tools.refinery.store.adapter.ModelAdapter;
import tools.refinery.store.map.DiffCursor;
import tools.refinery.store.map.Version;
import tools.refinery.store.model.*;
import tools.refinery.store.representation.AnySymbol;
import tools.refinery.store.representation.Symbol;
import tools.refinery.store.tuple.Tuple;
import java.util.*;
public class ModelImpl implements Model {
private final ModelStore store;
private Version state;
private LinkedHashMap<? extends AnySymbol, ? extends VersionedInterpretation<?>> interpretations;
private final List<ModelAdapter> adapters;
private final List<ModelListener> listeners = new ArrayList<>();
private boolean uncommittedChanges;
private ModelAction pendingAction = ModelAction.NONE;
private Version restoringToState = null;
ModelImpl(ModelStore store, Version state, int adapterCount) {
this.store = store;
this.state = state;
adapters = new ArrayList<>(adapterCount);
}
void setInterpretations(LinkedHashMap<? extends AnySymbol, ? extends VersionedInterpretation<?>> interpretations) {
this.interpretations = interpretations;
}
@Override
public ModelStore getStore() {
return store;
}
@Override
public Version getState() {
return state;
}
@Override
public <T> Interpretation<T> getInterpretation(Symbol<T> symbol) {
var interpretation = interpretations.get(symbol);
if (interpretation == null) {
throw new IllegalArgumentException("No interpretation for symbol %s in model".formatted(symbol));
}
@SuppressWarnings("unchecked")
var typedInterpretation = (Interpretation<T>) interpretation;
return typedInterpretation;
}
@Override
public ModelDiffCursor getDiffCursor(Version to) {
var diffCursors = new HashMap<AnySymbol, DiffCursor<Tuple, ?>>(interpretations.size());
for (var entry : interpretations.entrySet()) {
diffCursors.put(entry.getKey(), entry.getValue().getDiffCursor(to));
}
return new ModelDiffCursor(diffCursors);
}
private void setState(Version state) {
this.state = state;
uncommittedChanges = false;
}
void markAsChanged() {
if (!uncommittedChanges) {
uncommittedChanges = true;
}
}
@Override
public boolean hasUncommittedChanges() {
return uncommittedChanges;
}
private boolean hasPendingAction() {
return pendingAction != ModelAction.NONE || restoringToState != null;
}
@Override
public Version commit() {
if (hasPendingAction()) {
throw pendingActionError("commit");
}
pendingAction = ModelAction.COMMIT;
try {
int listenerCount = listeners.size();
int i = listenerCount;
// Before commit message to listeners
while (i > 0) {
i--;
listeners.get(i).beforeCommit();
}
// Doing the commit on the interpretations
Version[] interpretationVersions = new Version[interpretations.size()];
int j = 0;
for (var interpretationEntry : interpretations.entrySet()) {
interpretationVersions[j++] = interpretationEntry.getValue().commit();
}
ModelVersion modelVersion = new ModelVersion(interpretationVersions);
setState(modelVersion);
// After commit message to listeners
while (i < listenerCount) {
listeners.get(i).afterCommit();
i++;
}
return modelVersion;
} finally {
pendingAction = ModelAction.NONE;
}
}
@Override
public void restore(Version version) {
if (hasPendingAction()) {
throw pendingActionError("restore to %s".formatted(version));
}
pendingAction = ModelAction.RESTORE;
restoringToState = version;
try {
int listenerCount = listeners.size();
int i = listenerCount;
while (i > 0) {
i--;
listeners.get(i).beforeRestore(version);
}
int j = 0;
for (var interpretation : interpretations.values()) {
interpretation.restore(ModelVersion.getInternalVersion(version, j++));
}
setState(version);
while (i < listenerCount) {
listeners.get(i).afterRestore();
i++;
}
} finally {
pendingAction = ModelAction.NONE;
restoringToState = null;
}
}
public RuntimeException pendingActionError(String currentActionName) {
var pendingActionName = switch (pendingAction) {
case NONE -> throw new IllegalArgumentException("Trying to throw pending action error when there is no " +
"pending action");
case COMMIT -> "commit";
case RESTORE -> "restore to %s".formatted(restoringToState);
};
return new IllegalStateException("Cannot %s due to pending %s".formatted(currentActionName, pendingActionName));
}
@Override
public <T extends ModelAdapter> Optional<T> tryGetAdapter(Class<? extends T> adapterType) {
return AdapterUtils.tryGetAdapter(adapters, adapterType);
}
@Override
public <T extends ModelAdapter> T getAdapter(Class<T> adapterType) {
return AdapterUtils.getAdapter(adapters, adapterType);
}
void addAdapter(ModelAdapter adapter) {
adapters.add(adapter);
}
@Override
public void addListener(ModelListener listener) {
listeners.add(listener);
}
@Override
public void removeListener(ModelListener listener) {
listeners.remove(listener);
}
}
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