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/*******************************************************************************
* Copyright (c) 2005, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.engine;
import java.util.*;
import java.util.Map.Entry;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.equinox.internal.provisional.p2.engine.ProvisioningAction;
public class ParameterizedProvisioningAction extends ProvisioningAction {
private ProvisioningAction action;
private Map actionParameters;
public ParameterizedProvisioningAction(ProvisioningAction action, Map actionParameters) {
if (action == null || actionParameters == null)
throw new IllegalArgumentException("Both action and action pararameters must not be null."); //$NON-NLS-1$
this.action = action;
this.actionParameters = actionParameters;
}
public IStatus execute(Map parameters) {
parameters = processActionParameters(parameters);
return action.execute(parameters);
}
public IStatus undo(Map parameters) {
parameters = processActionParameters(parameters);
return action.undo(parameters);
}
private Map processActionParameters(Map parameters) {
Map result = new HashMap(parameters);
for (Iterator it = actionParameters.entrySet().iterator(); it.hasNext();) {
Entry entry = (Entry) it.next();
String name = (String) entry.getKey();
String value = processVariables((String) entry.getValue(), parameters);
result.put(name, value);
}
return Collections.unmodifiableMap(result);
}
private String processVariables(String parameterValue, Map parameters) {
int variableBeginIndex = parameterValue.indexOf("${"); //$NON-NLS-1$
if (variableBeginIndex == -1)
return parameterValue;
int variableEndIndex = parameterValue.indexOf('}', variableBeginIndex + 2);
if (variableEndIndex == -1)
return parameterValue;
String preVariable = parameterValue.substring(0, variableBeginIndex);
String variableName = parameterValue.substring(variableBeginIndex + 2, variableEndIndex);
String variableValue = parameters.get(variableName).toString();
String postVariable = processVariables(parameterValue.substring(variableEndIndex + 1), parameters);
return preVariable + variableValue + postVariable;
}
}
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