/*
* Copyright 2010-2017 the original author or authors.
*
* 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 org.springframework.data.mongodb.core.index;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import org.bson.Document;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.mongodb.core.Collation;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* @author Oliver Gierke
* @author Christoph Strobl
* @author Mark Paluch
*/
@SuppressWarnings("deprecation")
public class Index implements IndexDefinition {
public enum Duplicates {
RETAIN
}
private final Map<String, Direction> fieldSpec = new LinkedHashMap<String, Direction>();
private String name;
private boolean unique = false;
private boolean dropDuplicates = false;
private boolean sparse = false;
private boolean background = false;
private long expire = -1;
private Optional<IndexFilter> filter = Optional.empty();
private Optional<Collation> collation = Optional.empty();
public Index() {}
public Index(String key, Direction direction) {
fieldSpec.put(key, direction);
}
public Index on(String key, Direction direction) {
fieldSpec.put(key, direction);
return this;
}
public Index named(String name) {
this.name = name;
return this;
}
/**
* Reject all documents that contain a duplicate value for the indexed field.
*
* @return
* @see <a href=
* "https://docs.mongodb.org/manual/core/index-unique/">https://docs.mongodb.org/manual/core/index-unique/</a>
*/
public Index unique() {
this.unique = true;
return this;
}
/**
* Skip over any document that is missing the indexed field.
*
* @return
* @see <a href=
* "https://docs.mongodb.org/manual/core/index-sparse/">https://docs.mongodb.org/manual/core/index-sparse/</a>
*/
public Index sparse() {
this.sparse = true;
return this;
}
/**
* Build the index in background (non blocking).
*
* @return
* @since 1.5
*/
public Index background() {
this.background = true;
return this;
}
/**
* Specifies TTL in seconds.
*
* @param value
* @return
* @since 1.5
*/
public Index expire(long value) {
return expire(value, TimeUnit.SECONDS);
}
/**
* Specifies TTL with given {@link TimeUnit}.
*
* @param value
* @param unit
* @return
* @since 1.5
*/
public Index expire(long value, TimeUnit unit) {
Assert.notNull(unit, "TimeUnit for expiration must not be null.");
this.expire = unit.toSeconds(value);
return this;
}
/**
* Only index the documents in a collection that meet a specified {@link IndexFilter filter expression}.
*
* @param filter can be {@literal null}.
* @return
* @see <a href=
* "https://docs.mongodb.com/manual/core/index-partial/">https://docs.mongodb.com/manual/core/index-partial/</a>
* @since 1.10
*/
public Index partial(IndexFilter filter) {
this.filter = Optional.ofNullable(filter);
return this;
}
/**
* Set the {@link Collation} to specify language-specific rules for string comparison, such as rules for lettercase
* and accent marks.<br />
* <strong>NOTE:</strong> Only queries using the same {@link Collation} as the {@link Index} actually make use of the
* index.
*
* @param collation can be {@literal null}.
* @return
* @since 2.0
*/
public Index collation(Collation collation) {
this.collation = Optional.ofNullable(collation);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.mongodb.core.index.IndexDefinition#getIndexKeys()
*/
public Document getIndexKeys() {
Document document = new Document();
for (Entry<String, Direction> entry : fieldSpec.entrySet()) {
document.put(entry.getKey(), Direction.ASC.equals(entry.getValue()) ? 1 : -1);
}
return document;
}
public Document getIndexOptions() {
Document document = new Document();
if (StringUtils.hasText(name)) {
document.put("name", name);
}
if (unique) {
document.put("unique", true);
}
if (dropDuplicates) {
document.put("dropDups", true);
}
if (sparse) {
document.put("sparse", true);
}
if (background) {
document.put("background", true);
}
if (expire >= 0) {
document.put("expireAfterSeconds", expire);
}
filter.ifPresent(val -> document.put("partialFilterExpression", val.getFilterObject()));
collation.ifPresent(val -> document.append("collation", val.toDocument()));
return document;
}
@Override
public String toString() {
return String.format("Index: %s - Options: %s", getIndexKeys(), getIndexOptions());
}
}