org.pentaho.di.trans.dataservice.ui.AbstractModel.java Source code

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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 org.pentaho.di.trans.dataservice.ui;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Sets;
import org.pentaho.ui.xul.XulEventSourceAdapter;

import java.beans.PropertyChangeSupport;
import java.util.Map;

/**
 * @author nhudak
 */
public abstract class AbstractModel extends XulEventSourceAdapter {
    public abstract Map<String, Object> snapshot();

    public void setChangeSupport(PropertyChangeSupport changeSupport) {
        this.changeSupport = changeSupport;
    }

    protected void firePropertyChanges(Map<String, Object> previous) {
        Map<String, Object> update = buildSnapshot(snapshot());
        for (String attr : Sets.union(update.keySet(), previous.keySet())) {
            firePropertyChange(attr, previous.get(attr), update.get(attr));
        }
    }

    private static ImmutableMap<String, Object> buildSnapshot(Map<String, Object> snapshot) {
        ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
        for (Map.Entry<String, Object> entry : snapshot.entrySet()) {
            Object value = entry.getValue();
            if (value != null) {
                builder.put(entry);
            }
        }
        return builder.build();
    }

    protected void modify(Runnable runnable) {
        Map<String, Object> previous = buildSnapshot(snapshot());
        runnable.run();
        // Fire property change for all derived properties
        firePropertyChanges(previous);
    }
}