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SubjectsModifiedPartially.java
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SubjectsModifiedPartially.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.policies.model.signals.events;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.time.Instant;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.entity.metadata.Metadata;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.json.FieldType;
import org.eclipse.ditto.base.model.json.JsonParsableEvent;
import org.eclipse.ditto.base.model.json.JsonSchemaVersion;
import org.eclipse.ditto.base.model.signals.events.EventJsonDeserializer;
import org.eclipse.ditto.json.JsonCollectors;
import org.eclipse.ditto.json.JsonFactory;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonFieldDefinition;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.json.JsonObjectBuilder;
import org.eclipse.ditto.json.JsonParseException;
import org.eclipse.ditto.json.JsonPointer;
import org.eclipse.ditto.json.JsonValue;
import org.eclipse.ditto.policies.model.Label;
import org.eclipse.ditto.policies.model.PoliciesModelFactory;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.Subject;
/**
* This event is emitted after several {@link org.eclipse.ditto.policies.model.Subject}s of a Policy in multiple policy entries were modified/created.
*
* @since 2.0.0
*/
@Immutable
@JsonParsableEvent(name = SubjectsModifiedPartially.NAME, typePrefix = PolicyEvent.TYPE_PREFIX)
public final class SubjectsModifiedPartially extends AbstractPolicyActionEvent<SubjectsModifiedPartially> {
/**
* Name of this event
*/
public static final String NAME = "subjectsModifiedPartially";
/**
* Type of this event.
*/
public static final String TYPE = TYPE_PREFIX + NAME;
public static final JsonFieldDefinition<JsonObject> JSON_MODIFIED_SUBJECTS =
JsonFactory.newJsonObjectFieldDefinition("modifiedSubjects", FieldType.REGULAR, JsonSchemaVersion.V_2);
private final Map<Label, Collection<Subject>> modifiedSubjects;
private SubjectsModifiedPartially(
final PolicyId policyId,
final Map<Label, Collection<Subject>> modifiedSubjects,
final long revision,
@Nullable final Instant timestamp,
final DittoHeaders dittoHeaders,
@Nullable final Metadata metadata) {
super(TYPE, checkNotNull(policyId, "policyId"), revision, timestamp, dittoHeaders, metadata);
// Copying and unmodifiable wrapping happen in the factory method.
// Constructor does not copy in order to share the known unmodifiable field between instances.
this.modifiedSubjects = modifiedSubjects;
}
private SubjectsModifiedPartially(
final PolicyId policyId,
final JsonObject modifiedSubjects,
final long revision,
@Nullable final Instant timestamp,
final DittoHeaders dittoHeaders,
@Nullable final Metadata metadata) {
super(TYPE, checkNotNull(policyId, "policyId"), revision, timestamp, dittoHeaders, metadata);
this.modifiedSubjects =
modifiedSubjectsFromJson(checkNotNull(modifiedSubjects, "modifiedSubjects"));
}
/**
* Constructs a new {@code SubjectsModifiedPartially} object.
*
* @param policyId the policy ID.
* @param activatedSubjects subjects that are modified indexed by their policy entry labels.
* @param revision the revision of the Policy.
* @param timestamp the timestamp of this event.
* @param dittoHeaders the headers of the command which was the cause of this event.
* @param metadata the metadata to apply for the event.
* @return the created SubjectsModifiedPartially.
* @throws NullPointerException if any argument but {@code timestamp} is {@code null}.
*/
public static SubjectsModifiedPartially of(final PolicyId policyId,
final Map<Label, Collection<Subject>> activatedSubjects,
final long revision,
@Nullable final Instant timestamp,
final DittoHeaders dittoHeaders,
@Nullable final Metadata metadata) {
return new SubjectsModifiedPartially(policyId,
Collections.unmodifiableMap(
new LinkedHashMap<>(checkNotNull(activatedSubjects, "activatedSubjects"))),
revision, timestamp, dittoHeaders, metadata);
}
/**
* Creates a new {@code SubjectsModifiedPartially} from a JSON object.
*
* @param jsonObject the JSON object from which a new SubjectsModifiedPartially instance is to be created.
* @param dittoHeaders the headers of the command which was the cause of this event.
* @return the {@code SubjectsModifiedPartially} which was created from the given JSON object.
* @throws NullPointerException if {@code jsonObject} is {@code null}.
* @throws org.eclipse.ditto.json.JsonParseException if the passed in {@code jsonObject} was not in the expected
* 'SubjectsModifiedPartially' format.
*/
public static SubjectsModifiedPartially fromJson(final JsonObject jsonObject, final DittoHeaders dittoHeaders) {
return new EventJsonDeserializer<SubjectsModifiedPartially>(TYPE, jsonObject).deserialize(
(revision, timestamp, metadata) -> {
final String extractedPolicyId = jsonObject.getValueOrThrow(PolicyEvent.JsonFields.POLICY_ID);
final PolicyId policyId = PolicyId.of(extractedPolicyId);
final JsonObject modifiedSubjects = jsonObject.getValueOrThrow(JSON_MODIFIED_SUBJECTS);
return new SubjectsModifiedPartially(policyId, modifiedSubjects, revision, timestamp, dittoHeaders,
metadata);
});
}
/**
* Returns the modified subjects indexed by the labels of policy entries they belong to.
*
* @return the modified subjects.
*/
public Map<Label, Collection<Subject>> getModifiedSubjects() {
return modifiedSubjects;
}
@Override
public Optional<JsonValue> getEntity(final JsonSchemaVersion schemaVersion) {
return Optional.of(modifiedSubjectsToJson(modifiedSubjects));
}
@Override
public JsonPointer getResourcePath() {
return JsonPointer.empty();
}
@Override
public SubjectsModifiedPartially setRevision(final long revision) {
return new SubjectsModifiedPartially(getPolicyEntityId(), modifiedSubjects, revision,
getTimestamp().orElse(null), getDittoHeaders(), getMetadata().orElse(null));
}
@Override
public SubjectsModifiedPartially setDittoHeaders(final DittoHeaders dittoHeaders) {
return new SubjectsModifiedPartially(getPolicyEntityId(), modifiedSubjects, getRevision(),
getTimestamp().orElse(null), dittoHeaders, getMetadata().orElse(null));
}
@Override
protected void appendPayload(final JsonObjectBuilder jsonObjectBuilder, final JsonSchemaVersion schemaVersion,
final Predicate<JsonField> thePredicate) {
final Predicate<JsonField> predicate = schemaVersion.and(thePredicate);
jsonObjectBuilder.set(JSON_MODIFIED_SUBJECTS, modifiedSubjectsToJson(modifiedSubjects), predicate);
}
@Override
public SubjectsModifiedPartially aggregateWith(final Collection<PolicyActionEvent> otherPolicyActionEvents) {
return aggregateWithSubjectCreatedOrModified(modifiedSubjects, otherPolicyActionEvents);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), modifiedSubjects);
}
@Override
public boolean equals(@Nullable final Object o) {
if (this == o) {
return true;
}
if (null == o || getClass() != o.getClass()) {
return false;
}
final SubjectsModifiedPartially that = (SubjectsModifiedPartially) o;
return Objects.equals(modifiedSubjects, that.modifiedSubjects) && super.equals(that);
}
@Override
protected boolean canEqual(@Nullable final Object other) {
return other instanceof SubjectsModifiedPartially;
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" + super.toString() +
", modifiedSubjects=" + modifiedSubjects +
"]";
}
private static JsonObject subjectsToJsonWithId(final Collection<Subject> subjects) {
return subjects.stream()
.map(subject -> JsonField.newInstance(subject.getId(), subject.toJson()))
.collect(JsonCollectors.fieldsToObject());
}
private static Collection<Subject> subjectsFromJsonWithId(final JsonObject jsonObject) {
if (jsonObject.getSize() != 1) {
throw JsonParseException.newBuilder()
.message("Unexpected subject with ID format")
.build();
}
return jsonObject.stream()
.map(jsonField -> PoliciesModelFactory.newSubject(
jsonField.getKeyName(), jsonField.getValue().asObject()))
.collect(Collectors.toCollection(LinkedHashSet::new));
}
private static JsonObject modifiedSubjectsToJson(final Map<Label, Collection<Subject>> modifiedSubjects) {
return modifiedSubjects.entrySet()
.stream()
.map(entry -> JsonField.newInstance(entry.getKey(), subjectsToJsonWithId(entry.getValue())))
.collect(JsonCollectors.fieldsToObject());
}
/**
* Transform the passed {@code jsonObject} to a map of modified subjects as expected in the payload of this event.
*
* @param jsonObject the json object to read the modified subjects from.
* @return the map.
*/
public static Map<Label, Collection<Subject>> modifiedSubjectsFromJson(final JsonObject jsonObject) {
final Map<Label, Collection<Subject>> map = jsonObject.stream()
.collect(Collectors.toMap(field -> Label.of(field.getKeyName()),
field -> subjectsFromJsonWithId(field.getValue().asObject()),
(u, v) -> {
throw new IllegalStateException(String.format("Duplicate key %s", u));
},
LinkedHashMap::new));
return Collections.unmodifiableMap(map);
}
}