com.mongodb.client.internal.MongoIterableImpl Maven / Gradle / Ivy
/*
* Copyright 2008-present MongoDB, Inc.
*
* 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.mongodb.client.internal;
import com.mongodb.Block;
import com.mongodb.Function;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.client.ClientSession;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoIterable;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.BatchCursor;
import com.mongodb.operation.ReadOperation;
import java.util.Collection;
import static com.mongodb.assertions.Assertions.notNull;
/**
* This class is not part of the public API and may be removed or changed at any time.
*
* @param the result type
*/
@SuppressWarnings({ "deprecation"})
public abstract class MongoIterableImpl implements MongoIterable {
private final ClientSession clientSession;
private final ReadConcern readConcern;
private final OperationExecutor executor;
private final ReadPreference readPreference;
private final boolean retryReads;
private Integer batchSize;
public MongoIterableImpl(@Nullable final ClientSession clientSession, final OperationExecutor executor, final ReadConcern readConcern,
final ReadPreference readPreference, final boolean retryReads) {
this.clientSession = clientSession;
this.executor = notNull("executor", executor);
this.readConcern = notNull("readConcern", readConcern);
this.readPreference = notNull("readPreference", readPreference);
this.retryReads = notNull("retryReads", retryReads);
}
public abstract ReadOperation> asReadOperation();
@Nullable
ClientSession getClientSession() {
return clientSession;
}
OperationExecutor getExecutor() {
return executor;
}
ReadPreference getReadPreference() {
return readPreference;
}
protected ReadConcern getReadConcern() {
return readConcern;
}
protected boolean getRetryReads() {
return retryReads;
}
@Nullable
public Integer getBatchSize() {
return batchSize;
}
@Override
public MongoIterable batchSize(final int batchSize) {
this.batchSize = batchSize;
return this;
}
@Override
public MongoCursor iterator() {
return new MongoBatchCursorAdapter(execute());
}
@Override
public MongoCursor cursor() {
return iterator();
}
@Nullable
@Override
public TResult first() {
MongoCursor cursor = iterator();
try {
if (!cursor.hasNext()) {
return null;
}
return cursor.next();
} finally {
cursor.close();
}
}
@Override
public MongoIterable map(final Function mapper) {
return new MappingIterable(this, mapper);
}
@Override
public void forEach(final Block block) {
MongoCursor cursor = iterator();
try {
while (cursor.hasNext()) {
block.apply(cursor.next());
}
} finally {
cursor.close();
}
}
@Override
public > A into(final A target) {
forEach(new Block() {
@Override
public void apply(final TResult t) {
target.add(t);
}
});
return target;
}
private BatchCursor execute() {
return executor.execute(asReadOperation(), readPreference, readConcern, clientSession);
}
}