HasDevicesOfStatusFunctionExecutor.java
/*
* Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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.wso2.extension.siddhi.device;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.device.mgt.common.Device;
import org.wso2.carbon.device.mgt.common.DeviceManagementException;
import org.wso2.carbon.device.mgt.common.EnrolmentInfo;
import org.wso2.carbon.device.mgt.core.service.DeviceManagementProviderService;
import org.wso2.extension.siddhi.device.utils.DeviceUtils;
import org.wso2.siddhi.core.config.ExecutionPlanContext;
import org.wso2.siddhi.core.exception.ExecutionPlanRuntimeException;
import org.wso2.siddhi.core.executor.ExpressionExecutor;
import org.wso2.siddhi.core.executor.function.FunctionExecutor;
import org.wso2.siddhi.query.api.definition.Attribute;
import org.wso2.siddhi.query.api.exception.ExecutionPlanValidationException;
import java.util.List;
/**
* hasDevicesOfStatus(status [, deviceType])
* Returns true if there are devices with specified status
* Accept Type(s): (STRING, STRING)
* Return Type(s): (BOOL)
*/
public class HasDevicesOfStatusFunctionExecutor extends FunctionExecutor {
private static Log log = LogFactory.getLog(HasDevicesOfStatusFunctionExecutor.class);
private Attribute.Type returnType = Attribute.Type.BOOL;
@Override
protected void init(ExpressionExecutor[] attributeExpressionExecutors,
ExecutionPlanContext executionPlanContext) {
if (attributeExpressionExecutors.length != 1 && attributeExpressionExecutors.length != 2) {
throw new ExecutionPlanValidationException(
"Invalid no of arguments passed to device:hasDevicesOfStatus() function, required 2 but found " +
attributeExpressionExecutors.length);
}
if (attributeExpressionExecutors[0].getReturnType() != Attribute.Type.STRING) {
throw new ExecutionPlanValidationException(
"Invalid parameter type found for the first argument (status) of device:hasDevicesOfStatus() " +
"function, required " + Attribute.Type.STRING + " as status, but found " +
attributeExpressionExecutors[0].getReturnType().toString());
}
if (attributeExpressionExecutors.length == 2
&& attributeExpressionExecutors[1].getReturnType() != Attribute.Type.STRING) {
throw new ExecutionPlanValidationException(
"Invalid parameter type found for the second argument (device type) of device:hasDevicesOfStatus() " +
"function, required " + Attribute.Type.STRING + " as device type, but found " +
attributeExpressionExecutors[1].getReturnType().toString());
}
}
@Override
protected Object execute(Object[] data) {
if (data[0] == null) {
throw new ExecutionPlanRuntimeException("Invalid input given to device:hasDevicesOfStatus() function. " +
"First argument cannot be null");
}
if (data.length == 2 && data[1] == null) {
throw new ExecutionPlanRuntimeException("Invalid input given to device:hasDevicesOfStatus() function. " +
"Second argument cannot be null");
}
String status = (String) data[0];
String deviceType = null;
if (data.length == 2) {
deviceType = (String) data[1];
}
try {
DeviceManagementProviderService deviceManagementProviderService = DeviceUtils.getDeviceManagementProviderService();
List<Device> devices = deviceManagementProviderService.getDevicesByStatus(EnrolmentInfo.Status.valueOf(status), false);
if (deviceType == null) {
return !devices.isEmpty();
} else {
for (Device device : devices) {
if (deviceType.equalsIgnoreCase(device.getType())) {
return true;
}
}
return false;
}
} catch (DeviceManagementException e) {
log.error("Error occurred while getting devices with status " + status, e);
}
return false;
}
@Override
protected Object execute(Object data) {
return execute(new Object[]{data});
}
@Override
public void start() {
//Nothing to start
}
@Override
public void stop() {
//Nothing to stop
}
@Override
public Attribute.Type getReturnType() {
return returnType;
}
@Override
public Object[] currentState() {
return null; //No need to maintain a state.
}
@Override
public void restoreState(Object[] state) {
//Since there's no need to maintain a state, nothing needs to be done here.
}
}