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// Copyright (C) 2016 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 java.util.Objects.requireNonNull;

import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Iterables;
import com.google.gerrit.common.Nullable;

/**
 * Definitions of the various schema versions over a given Gerrit data type.
 *
 * 

A schema is a description of the fields that are indexed over the given data type. * This class contains all the versions of a schema defined over its data type, exposed as a map of * version number to schema definition. If you are interested in the classes responsible for * backend-specific runtime implementations, see the implementations of {@link IndexDefinition}. */ public abstract class SchemaDefinitions { private final String name; private final ImmutableSortedMap> schemas; protected SchemaDefinitions(String name, Class valueClass) { this.name = requireNonNull(name); this.schemas = SchemaUtil.schemasFromClass(getClass(), valueClass); } public final String getName() { return name; } /** Returns all schemas sorted by version (ascending). */ public final ImmutableSortedMap> getSchemas() { return schemas; } public final Schema get(int version) { Schema schema = schemas.get(version); checkArgument(schema != null, "Unrecognized %s schema version: %s", name, version); return schema; } public final Schema getLatest() { return schemas.lastEntry().getValue(); } @Nullable public final Schema getPrevious() { if (schemas.size() <= 1) { return null; } return Iterables.get(schemas.descendingMap().values(), 1); } }





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