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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson
/*
* Copyright (c) 2008-2014 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;
import java.util.List;
/**
* A simple wrapper to hold the result of a command. All the fields from the response document have been added to this result.
*
* @mongodb.driver.manual reference/command/ Database Commands
*/
public class CommandResult extends BasicDBObject {
CommandResult(ServerAddress serverAddress) {
if (serverAddress == null) {
throw new IllegalArgumentException("server address is null");
}
_host = serverAddress;
//so it is shown in toString/debug
put("serverUsed", serverAddress.toString());
}
/**
* Gets the "ok" field, which is whether this command executed correctly or not.
*
* @return true if the command executed without error.
*/
public boolean ok() {
Object okValue = get("ok");
if (okValue instanceof Boolean) {
return (Boolean) okValue;
} else if (okValue instanceof Number) {
return ((Number) okValue).intValue() == 1;
} else {
return false;
}
}
/**
* Gets the error message associated with a failed command.
*
* @return The error message or null
*/
public String getErrorMessage() {
Object errorMessage = get("errmsg");
if (errorMessage == null) {
return null;
}
return errorMessage.toString();
}
/**
* Utility method to create an exception from a failed command.
*
* @return The mongo exception, or null if the command was successful.
*/
public MongoException getException() {
if (!ok()) { // check for command failure
if (getCode() == 50) {
return new MongoExecutionTimeoutException(getCode(), getErrorMessage());
} else {
return new CommandFailureException(this);
}
} else if (hasErr()) {
return getWriteException();
} else {
return null;
}
}
private MongoException getWriteException() {
int code = getCode();
if (code == 11000 || code == 11001 || code == 12582) {
return new MongoException.DuplicateKey(this);
} else {
return new WriteConcernException(this);
}
}
/**
* Returns the "code" field, as an int
*
* @return -1 if there is no code
*/
@SuppressWarnings("unchecked")
int getCode() {
int code = getInt("code", -1);
// mongos may set an err field containing duplicate key error information
if (get("err") != null && ((String) get("err")).contains("E11000 duplicate key error")) {
return 11000;
}
// mongos may return a list of documents representing getlasterror responses from each shard. Return the one with a matching
// "err" field, so that it can be used to get the error code
if (code == -1 && get("errObjects") != null) {
for (BasicDBObject curErrorDocument : (List) get("errObjects")) {
if (get("err").equals(curErrorDocument.get("err"))) {
code = curErrorDocument.getInt("code", -1);
break;
}
}
}
return code;
}
/**
* Check the "err" field
*
* @return if it has it, and isn't null
*/
boolean hasErr() {
String err = getString("err");
return err != null && err.length() > 0;
}
/**
* Throws a {@code CommandFailureException} if the command failed. Otherwise, returns normally.
*
* @throws MongoException
* @see #ok()
*/
public void throwOnError() {
if (!ok() || hasErr()) {
throw getException();
}
}
/**
* @return the server the command ran against
* @deprecated there is no replacement for this method
*/
@Deprecated
public ServerAddress getServerUsed() {
return _host;
}
private final ServerAddress _host;
private static final long serialVersionUID = 1L;
}
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