/*
* Copyright 2003-2014 JetBrains s.r.o.
*
* 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 jetbrains.mps.migration.global;
import jetbrains.mps.components.CoreComponent;
import jetbrains.mps.project.Project;
import java.util.HashMap;
import java.util.Map;
/**
* A storage for properties, which define the persistent state of project migrations
* Default value is null. Null value is not distinguishable from not-set
*/
public class MigrationPropertiesManager implements CoreComponent {
private static MigrationPropertiesManager INSTANCE;
public static MigrationPropertiesManager getInstance() {
return INSTANCE;
}
@Override
public void init() {
if (INSTANCE != null) {
throw new IllegalStateException("double initialization");
}
INSTANCE = this;
}
@Override
public void dispose() {
INSTANCE = null;
}
//----------
private Map<Project, MigrationProperties> contributors = new HashMap<Project, MigrationProperties>();
public MigrationProperties getProperties(Project p) {
return contributors.get(p);
}
public void addProperties(Project p, MigrationProperties mp) {
contributors.put(p, mp);
}
public void removeProperties(Project p) {
contributors.remove(p);
}
}