com.google.gerrit.index.Schema Maven / Gradle / Ivy
// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.index;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.collect.ImmutableMap.toImmutableMap;
import static com.google.common.collect.ImmutableSet.toImmutableSet;
import com.google.common.base.MoreObjects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.index.SchemaFieldDefs.SchemaField;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
/** Specific version of a secondary index schema. */
public class Schema {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static class Builder {
private final List> searchFields = new ArrayList<>();
private final List> indexedFields = new ArrayList<>();
private Optional version = Optional.empty();
public Builder version(int version) {
this.version = Optional.of(version);
return this;
}
public Builder add(Schema schema) {
this.indexedFields.addAll(schema.getIndexFields().values());
this.searchFields.addAll(schema.getSchemaFields().values());
if (!version.isPresent()) {
version(schema.getVersion() + 1);
}
return this;
}
@SafeVarargs
public final Builder addSearchSpecs(IndexedField.SearchSpec... searchSpecs) {
return addSearchSpecs(ImmutableList.copyOf(searchSpecs));
}
public Builder addSearchSpecs(ImmutableList.SearchSpec> searchSpecs) {
for (IndexedField.SearchSpec searchSpec : searchSpecs) {
checkArgument(
this.indexedFields.contains(searchSpec.getField()),
"%s spec can only be added to the schema that contains %s field",
searchSpec.getName(),
searchSpec.getField().name());
}
this.searchFields.addAll(searchSpecs);
return this;
}
@SafeVarargs
public final Builder addIndexedFields(IndexedField... fields) {
return addIndexedFields(ImmutableList.copyOf(fields));
}
public Builder addIndexedFields(ImmutableList> indexedFields) {
this.indexedFields.addAll(indexedFields);
return this;
}
@SafeVarargs
public final Builder remove(IndexedField.SearchSpec... searchSpecs) {
this.searchFields.removeAll(Arrays.asList(searchSpecs));
return this;
}
@SafeVarargs
public final Builder remove(IndexedField... indexedFields) {
for (IndexedField field : indexedFields) {
ImmutableMap.SearchSpec> searchSpecs =
field.getSearchSpecs();
checkArgument(
!searchSpecs.values().stream().anyMatch(this.searchFields::contains),
"Field %s can be only removed from schema after all of its searches are removed.",
field.name());
}
this.indexedFields.removeAll(Arrays.asList(indexedFields));
return this;
}
public Schema build() {
checkState(version.isPresent());
return new Schema<>(
version.get(), ImmutableList.copyOf(indexedFields), ImmutableList.copyOf(searchFields));
}
}
public static class Values {
private final SchemaField field;
private final Iterable values;
private Values(SchemaField field, Iterable values) {
this.field = field;
this.values = values;
}
public SchemaField getField() {
return field;
}
public Iterable getValues() {
return values;
}
}
private static SchemaField checkSame(SchemaField f1, SchemaField f2) {
checkState(f1 == f2, "Mismatched %s fields: %s != %s", f1.getName(), f1, f2);
return f1;
}
private final ImmutableSet storedFields;
private final ImmutableMap> schemaFields;
private final ImmutableMap> indexedFields;
private int version;
private Schema(
int version,
ImmutableList> indexedFields,
ImmutableList> schemaFields) {
this.version = version;
this.indexedFields =
indexedFields.stream().collect(toImmutableMap(IndexedField::name, Function.identity()));
this.schemaFields =
schemaFields.stream().collect(toImmutableMap(SchemaField::getName, Function.identity()));
Set duplicateKeys =
Sets.intersection(this.schemaFields.keySet(), this.indexedFields.keySet());
checkArgument(
duplicateKeys.isEmpty(),
"DuplicateKeys found %s, indexFields:%s, schemaFields: %s",
duplicateKeys,
this.indexedFields.keySet(),
this.schemaFields.keySet());
this.storedFields =
schemaFields.stream()
.filter(SchemaField::isStored)
.map(SchemaField::getName)
.collect(toImmutableSet());
}
public final int getVersion() {
return version;
}
/**
* Get all fields in this schema.
*
* This is primarily useful for iteration. Most callers should prefer one of the helper methods
* {@link #getField(SchemaField, SchemaField...)} or {@link #hasField(SchemaField)} to looking up
* fields by name
*
* @return all fields in this schema indexed by name.
*/
public final ImmutableMap> getSchemaFields() {
return schemaFields;
}
public final ImmutableMap> getIndexFields() {
return indexedFields;
}
/**
* Returns names of {@link SchemaField} fields in this schema where {@link SchemaField#isStored()}
* is true.
*/
public final ImmutableSet getStoredFields() {
return storedFields;
}
/**
* Look up fields in this schema.
*
* @param first the preferred field to look up.
* @param rest additional fields to look up.
* @return the first field in the schema matching {@code first} or {@code rest}, in order, or
* absent if no field matches.
*/
@SafeVarargs
public final Optional> getField(
SchemaField first, SchemaField... rest) {
SchemaField field = getSchemaField(first);
if (field != null) {
return Optional.of(checkSame(field, first));
}
for (SchemaField f : rest) {
field = getSchemaField(first);
if (field != null) {
return Optional.of(checkSame(field, f));
}
}
return Optional.empty();
}
/**
* Check whether a field is present in this schema.
*
* @param field field to look up.
* @return whether the field is present.
*/
public final boolean hasField(SchemaField field) {
SchemaField f = getSchemaField(field);
if (f == null) {
return false;
}
checkSame(f, field);
return true;
}
public final boolean hasField(String fieldName) {
return this.getSchemaField(fieldName) != null;
}
private SchemaField getSchemaField(SchemaField field) {
return getSchemaField(field.getName());
}
public SchemaField getSchemaField(String fieldName) {
return schemaFields.get(fieldName);
}
private @Nullable Values fieldValues(
T obj, SchemaField f, ImmutableSet skipFields) {
if (skipFields.contains(f.getName())) {
return null;
}
Object v;
try {
v = f.get(obj);
} catch (StorageException e) {
// StorageException is thrown when the object is not found. On this case,
// it is pointless to make further attempts for each field, so propagate
// the exception to return an empty list.
logger.atSevere().withCause(e).log("error getting field %s of %s", f.getName(), obj);
throw e;
} catch (RuntimeException e) {
logger.atSevere().withCause(e).log("error getting field %s of %s", f.getName(), obj);
return null;
}
if (v == null) {
return null;
} else if (f.isRepeatable()) {
return new Values<>(f, (Iterable) v);
} else {
return new Values<>(f, Collections.singleton(v));
}
}
/**
* Build all fields in the schema from an input object.
*
* Null values are omitted, as are fields which cause errors, which are logged.
*
* @param obj input object.
* @param skipFields set of field names to skip when indexing the document
* @return all non-null field values from the object.
*/
public final Iterable> buildFields(T obj, ImmutableSet skipFields) {
try {
return schemaFields.values().stream()
.map(f -> fieldValues(obj, f, skipFields))
.filter(Objects::nonNull)
.collect(toImmutableList());
} catch (StorageException e) {
return ImmutableList.of();
}
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.addValue(indexedFields.keySet())
.addValue(schemaFields.keySet())
.toString();
}
}