/
CombinedSchemaDiff.java
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/
CombinedSchemaDiff.java
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/*
* Copyright 2020 Confluent Inc.
*
* Licensed under the Confluent Community License (the "License"); you may not use
* this file except in compliance with the License. You may obtain a copy of the
* License at
*
* http://www.confluent.io/confluent-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package io.confluent.kafka.schemaregistry.json.diff;
import io.confluent.kafka.schemaregistry.json.JsonSchema;
import io.confluent.kafka.schemaregistry.json.utils.Edge;
import io.confluent.kafka.schemaregistry.json.utils.MaximumCardinalityMatch;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.everit.json.schema.CombinedSchema;
import org.everit.json.schema.CombinedSchema.ValidationCriterion;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.COMBINED_TYPE_CHANGED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.COMBINED_TYPE_EXTENDED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.COMBINED_TYPE_SUBSCHEMAS_CHANGED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.PRODUCT_TYPE_EXTENDED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.PRODUCT_TYPE_NARROWED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.SUM_TYPE_EXTENDED;
import static io.confluent.kafka.schemaregistry.json.diff.Difference.Type.SUM_TYPE_NARROWED;
class CombinedSchemaDiff {
static void compare(
final Context ctx,
final CombinedSchema original,
final CombinedSchema update
) {
Difference.Type type = compareCriteria(ctx, original, update);
if (type != COMBINED_TYPE_CHANGED) {
// Use sets to collapse duplicate entries
final Set<JsonSchema> originalSubschemas = original.getSubschemas().stream()
.map(JsonSchema::new).collect(Collectors.toCollection(LinkedHashSet::new));
final Set<JsonSchema> updateSubschemas = update.getSubschemas().stream()
.map(JsonSchema::new).collect(Collectors.toCollection(LinkedHashSet::new));
int originalSize = originalSubschemas.size();
int updateSize = updateSubschemas.size();
if (originalSize < updateSize) {
if (update.getCriterion() == CombinedSchema.ALL_CRITERION) {
ctx.addDifference(PRODUCT_TYPE_EXTENDED);
} else {
ctx.addDifference(SUM_TYPE_EXTENDED);
}
} else if (originalSize > updateSize) {
if (original.getCriterion() == CombinedSchema.ANY_CRITERION
|| original.getCriterion() == CombinedSchema.ONE_CRITERION) {
ctx.addDifference(SUM_TYPE_NARROWED);
} else {
ctx.addDifference(PRODUCT_TYPE_NARROWED);
}
}
int index = 0;
Set<Edge<JsonSchema, List<Difference>>> compatibleEdges = new HashSet<>();
for (JsonSchema originalSubschema : originalSubschemas) {
try (Context.PathScope pathScope = ctx.enterPath(original.getCriterion() + "/" + index)) {
for (JsonSchema updateSubschema : updateSubschemas) {
final Context subctx = ctx.getSubcontext();
SchemaDiff.compare(subctx, originalSubschema.rawSchema(), updateSubschema.rawSchema());
if (subctx.isCompatible()) {
compatibleEdges.add(
new Edge<>(originalSubschema, updateSubschema, subctx.getDifferences()));
}
}
}
index++;
}
MaximumCardinalityMatch<JsonSchema, List<Difference>> match =
new MaximumCardinalityMatch<>(compatibleEdges, originalSubschemas, updateSubschemas);
Set<Edge<JsonSchema, List<Difference>>> matching = match.getMatching();
for (Edge<JsonSchema, List<Difference>> matchingEdge : matching) {
ctx.addDifferences(matchingEdge.value());
}
if (matching.size() < Math.min(originalSize, updateSize)) {
// Did not find a matching that covers the smaller partition,
// ensure the result is incompatible
ctx.addDifference(COMBINED_TYPE_SUBSCHEMAS_CHANGED);
}
}
}
private static Difference.Type compareCriteria(
final Context ctx,
final CombinedSchema original,
final CombinedSchema update
) {
ValidationCriterion originalCriterion = original.getCriterion();
ValidationCriterion updateCriterion = update.getCriterion();
Difference.Type type;
if (originalCriterion.equals(updateCriterion)) {
type = null;
} else if (updateCriterion == CombinedSchema.ANY_CRITERION
|| (isSingleton(original) && isSingleton(update))
|| (isSingleton(original) && updateCriterion == CombinedSchema.ONE_CRITERION)
|| (isSingleton(update) && originalCriterion == CombinedSchema.ALL_CRITERION)) {
type = COMBINED_TYPE_EXTENDED;
} else {
type = COMBINED_TYPE_CHANGED;
}
if (type != null) {
ctx.addDifference(type);
}
return type;
}
private static boolean isSingleton(CombinedSchema schema) {
return schema.getSubschemas().size() == 1;
}
}