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CommandLineParameterizer.java
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CommandLineParameterizer.java
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/*
* Copyright 2009 LinkedIn, 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 voldemort.utils.impl;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.lang.StringUtils;
/**
* CommandLineParameterizer handles the task of replacing parameter placeholders
* with their provided values. This is used to change a command line template
* into an executable statement.
*
* <p/>
*
* The format for parameters is ${variableName}. These variables appear in a
* template and are substituted on demand.
*
*/
public class CommandLineParameterizer {
public static final String HOST_NAME_PARAM = "hostName";
public static final String HOST_USER_ID_PARAM = "hostUserId";
public static final String SSH_PRIVATE_KEY_PARAM = "sshPrivateKey";
public static final String VOLDEMORT_ROOT_DIRECTORY_PARAM = "voldemortRootDirectory";
public static final String VOLDEMORT_HOME_DIRECTORY_PARAM = "voldemortHomeDirectory";
public static final String VOLDEMORT_NODE_ID_PARAM = "voldemortNodeId";
public static final String RAMP_TIME_PARAM = "rampTime";
public static final String SOURCE_DIRECTORY_PARAM = "sourceDirectory";
public static final String DESTINATION_DIRECTORY_PARAM = "destinationDirectory";
public static final String TEST_COMMAND_PARAM = "testCommand";
private final String rawCommand;
public CommandLineParameterizer(String commandId) {
Properties properties = new Properties();
try {
properties.load(getClass().getClassLoader().getResourceAsStream("commands.properties"));
} catch(Exception e) {
throw new IllegalStateException(e);
}
rawCommand = properties.getProperty(commandId);
}
public String parameterize(Map<String, String> parameters) {
String command = rawCommand;
for(Map.Entry<String, String> parameter: parameters.entrySet())
command = StringUtils.replace(command,
"${" + parameter.getKey() + "}",
parameter.getValue());
return command;
}
}