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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2021 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.auth.clieditor;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Properties;
import java.util.SortedMap;
import org.onap.policy.apex.model.modelapi.ApexApiResult;
import org.onap.policy.apex.model.modelapi.ApexApiResult.Result;
import org.onap.policy.apex.model.modelapi.ApexModel;
import org.onap.policy.apex.model.modelapi.ApexModelFactory;
/**
* This class instantiates and holds the Apex model being manipulated by the editor.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class ApexModelHandler {
private static final String FAILED_FOR_COMMAND = "\" failed for command \"";
private static final String INVOCATION_OF_SPECIFIED_METHOD = "invocation of specified method \"";
private ApexModel apexModel = null;
/**
* Create the Apex Model with the properties specified.
*
* @param properties The properties of the Apex model
*/
public ApexModelHandler(final Properties properties) {
apexModel = new ApexModelFactory().createApexModel(properties, true);
}
/**
* Create the Apex Model with the properties specified and load it from a file.
*
* @param properties The properties of the Apex model
* @param modelFileName The name of the model file to edit
*/
public ApexModelHandler(final Properties properties, final String modelFileName) {
this(properties);
if (modelFileName == null) {
return;
}
final ApexApiResult result = apexModel.loadFromFile(modelFileName);
if (result.isNok()) {
throw new CommandLineException(result.getMessages().get(0));
}
}
/**
* Execute a command on the Apex model.
*
* @param command The command to execute
* @param argumentValues Arguments of the command
* @param writer A writer to which to write output
* @return the result of the executed command
*/
public Result executeCommand(final CommandLineCommand command,
final SortedMap<String, CommandLineArgumentValue> argumentValues, final PrintWriter writer) {
// Get the method
final var apiMethod = getCommandMethod(command);
// Get the method arguments
final Object[] parameterArray = getParameterArray(command, argumentValues, apiMethod);
try {
final var returnObject = apiMethod.invoke(apexModel, parameterArray);
if (returnObject instanceof ApexApiResult) {
final ApexApiResult result = (ApexApiResult) returnObject;
writer.println(result);
return result.getResult();
} else {
throw new CommandLineException(INVOCATION_OF_SPECIFIED_METHOD + command.getApiMethod()
+ FAILED_FOR_COMMAND + command.getName()
+ "\" the returned object is not an instance of ApexAPIResult");
}
} catch (IllegalAccessException | IllegalArgumentException e) {
writer.println(INVOCATION_OF_SPECIFIED_METHOD + command.getApiMethod() + FAILED_FOR_COMMAND
+ command.getName() + "\"");
e.printStackTrace(writer);
throw new CommandLineException(INVOCATION_OF_SPECIFIED_METHOD + command.getApiMethod() + FAILED_FOR_COMMAND
+ command.getName() + "\"", e);
} catch (final InvocationTargetException e) {
writer.println(INVOCATION_OF_SPECIFIED_METHOD + command.getApiMethod() + FAILED_FOR_COMMAND
+ command.getName() + "\"");
e.getCause().printStackTrace(writer);
throw new CommandLineException(INVOCATION_OF_SPECIFIED_METHOD + command.getApiMethod() + FAILED_FOR_COMMAND
+ command.getName() + "\"", e);
}
}
/**
* Find the API method for the command.
*
* @param command The command
* @return the API method
*/
private Method getCommandMethod(final CommandLineCommand command) {
final String className = command.getApiClassName();
final String methodName = command.getApiMethodName();
try {
final Class<? extends Object> apiClass = Class.forName(className);
for (final Method apiMethod : apiClass.getMethods()) {
if (apiMethod.getName().equals(methodName)) {
return apiMethod;
}
}
throw new CommandLineException("specified method \"" + command.getApiMethod()
+ "\" not found for command \"" + command.getName() + "\"");
} catch (final ClassNotFoundException e) {
throw new CommandLineException("specified class \"" + command.getApiMethod() + "\" not found for command \""
+ command.getName() + "\"", e);
}
}
/**
* Get the arguments of the command as an ordered array of objects ready for the method.
*
* @param command the command that invoked the method
* @param argumentValues the argument values for the method
* @param apiMethod the method itself
* @return the argument list
*/
private Object[] getParameterArray(final CommandLineCommand command,
final SortedMap<String, CommandLineArgumentValue> argumentValues, final Method apiMethod) {
final var parameterArray = new Object[argumentValues.size()];
var item = 0;
try {
for (final Class<?> parametertype : apiMethod.getParameterTypes()) {
final String parameterValue = argumentValues.get(command.getArgumentList().get(item).getArgumentName())
.getValue();
if (parametertype.equals(boolean.class)) {
parameterArray[item] = Boolean.valueOf(parameterValue);
} else {
parameterArray[item] = parameterValue;
}
item++;
}
} catch (final Exception e) {
throw new CommandLineException("number of argument mismatch on method \"" + command.getApiMethod()
+ "\" for command \"" + command.getName() + "\"", e);
}
return parameterArray;
}
/**
* Save the model to a string.
*
* @param messageWriter the writer to write status messages to
* @return the string
*/
public String writeModelToString(final PrintWriter messageWriter) {
final ApexApiResult result = apexModel.listModel();
if (result.isOk()) {
return result.getMessage();
} else {
return null;
}
}
}
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