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JaVers - object auditing and diff framework for Java
package org.javers.core.json.typeadapter.change;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonSerializationContext;
import org.javers.common.exception.JaversException;
import org.javers.common.exception.JaversExceptionCode;
import org.javers.core.commit.CommitMetadata;
import org.javers.core.diff.Change;
import org.javers.core.diff.changetype.*;
import org.javers.core.diff.changetype.container.ArrayChange;
import org.javers.core.diff.changetype.container.ListChange;
import org.javers.core.diff.changetype.container.SetChange;
import org.javers.core.diff.changetype.map.MapChange;
import org.javers.core.json.JsonTypeAdapterTemplate;
import org.javers.core.metamodel.object.GlobalId;
import org.javers.core.metamodel.type.JaversProperty;
import org.javers.core.metamodel.type.ManagedType;
import org.javers.core.metamodel.type.TypeMapper;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
class ChangeTypeAdapter extends JsonTypeAdapterTemplate {
private static final String CHANGE_TYPE_FIELD = "changeType";
private static final String AFFECTED_CDO_ID_FIELD = "globalId";
private static final String PROPERTY_FIELD = "property";
private static final String COMMIT_METADATA = "commitMetadata";
private static final String PROPERTY_CHANGE_TYPE = "propertyChangeType";
private final Map> changeTypeMap;
protected final TypeMapper typeMapper;
public ChangeTypeAdapter(TypeMapper typeMapper) {
this.changeTypeMap = new HashMap<>();
this.typeMapper = typeMapper;
initEntry(ValueChange.class);
initEntry(ReferenceChange.class);
initEntry(NewObject.class);
initEntry(ObjectRemoved.class);
initEntry(MapChange.class);
initEntry(ListChange.class);
initEntry(ArrayChange.class);
initEntry(SetChange.class);
}
protected CommitMetadata deserializeCommitMetadata(JsonObject jsonObject, JsonDeserializationContext context) {
return context.deserialize(jsonObject.get(COMMIT_METADATA), CommitMetadata.class);
}
protected ManagedType getManagedType(PropertyChangeMetadata stub) {
return typeMapper.getJaversManagedType(stub.getAffectedCdoId());
}
protected JaversProperty getJaversProperty(PropertyChangeMetadata stub) {
return getManagedType(stub).getProperty(stub.getPropertyName());
}
@Override
public T fromJson(JsonElement json, JsonDeserializationContext context) {
JsonObject jsonObject = (JsonObject) json;
String changeTypeField = jsonObject.get(CHANGE_TYPE_FIELD).getAsString();
Class changeType = decode(changeTypeField);
return context.deserialize(json, changeType);
}
@Override
public JsonElement toJson(T change, JsonSerializationContext context) {
return createJsonObject(change, context);
}
protected PropertyChangeMetadata deserializeStub(JsonObject jsonObject, JsonDeserializationContext context) {
GlobalId id = deserializeAffectedCdoId(jsonObject, context);
String propertyName = jsonObject.get(PROPERTY_FIELD).getAsString();
CommitMetadata commitMetadata = deserializeCommitMetadata(jsonObject, context);
PropertyChangeType propertyChangeType = jsonObject.get(PROPERTY_CHANGE_TYPE) != null
? PropertyChangeType.valueOf(jsonObject.get(PROPERTY_CHANGE_TYPE).getAsString())
: PropertyChangeType.PROPERTY_VALUE_CHANGED;
return new PropertyChangeMetadata(id, propertyName, Optional.ofNullable(commitMetadata), propertyChangeType);
}
protected GlobalId deserializeAffectedCdoId(JsonObject jsonObject, JsonDeserializationContext context) {
return context.deserialize(jsonObject.get(AFFECTED_CDO_ID_FIELD), GlobalId.class);
}
protected JsonObject createJsonObject(T change, JsonSerializationContext context) {
JsonObject jsonObject = new JsonObject();
jsonObject.addProperty(CHANGE_TYPE_FIELD, encode(change.getClass()));
jsonObject.add(AFFECTED_CDO_ID_FIELD, context.serialize(change.getAffectedGlobalId()));
if (change.getCommitMetadata().isPresent()) {
jsonObject.add(COMMIT_METADATA, context.serialize(change.getCommitMetadata().get()));
}
if (change instanceof PropertyChange) {
jsonObject.addProperty(PROPERTY_FIELD, ((PropertyChange) change).getPropertyName());
PropertyChangeType changeType = ((PropertyChange) change).getChangeType();
if (changeType != null) {
jsonObject.addProperty(PROPERTY_CHANGE_TYPE, changeType.name());
}
}
return jsonObject;
}
@Override
public Class getValueType() {
return Change.class;
}
private void initEntry(Class valueChangeClass) {
changeTypeMap.put(encode(valueChangeClass), valueChangeClass);
}
private String encode(Class valueChangeClass) {
return valueChangeClass.getSimpleName();
}
private Class decode(String changeType){
if (!changeTypeMap.containsKey(changeType)) {
throw new JaversException(JaversExceptionCode.MALFORMED_CHANGE_TYPE_FIELD, changeType);
}
return changeTypeMap.get(changeType);
}
}