gov.nasa.ensemble.common.event.ModelChangeEvent.java Source code

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Here is the source code for gov.nasa.ensemble.common.event.ModelChangeEvent.java

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/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * 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 gov.nasa.ensemble.common.event;

import java.util.EventObject;

import org.apache.commons.lang.builder.ToStringBuilder;

@SuppressWarnings("serial")
public class ModelChangeEvent extends EventObject {

    public enum TYPE {
        ADD, REMOVE, SET
    }

    private Enum<?> field;
    private Object oldValue;
    private Object newValue;
    private long time;

    /**
     * @param source
     * @param field
     * @param oldValue
     * @param newValue
     */
    public ModelChangeEvent(Object source, Enum<?> field, Object oldValue, Object newValue) {
        super(source);
        this.field = field;
        this.oldValue = oldValue;
        this.newValue = newValue;
        this.time = System.nanoTime();
    }

    // For add
    //source = parent
    //propertyName = activity (list belongs to)
    //oldValue = null   
    //newValue = child

    // For remove
    //source = parent
    //propertyName = activity (list belongs to)
    //oldValue = child  
    //newValue = null

    /**
     * @return Returns the field.
     */
    public Enum<?> getField() {
        return field;
    }

    /**
     * @return Returns the newValue.
     */
    public Object getNewValue() {
        return newValue;
    }

    /**
     * @return Returns the oldValue.
     */
    public Object getOldValue() {
        return oldValue;
    }

    public long getTime() {
        return time;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).append("source", source).append("field", field)
                .append("oldValue", oldValue).append("newValue", newValue).toString();
    }

    @Override
    public int hashCode() {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + source.hashCode();
        result = PRIME * result + ((field == null) ? 0 : field.hashCode());
        result = PRIME * result + ((newValue == null) ? 0 : newValue.hashCode());
        result = PRIME * result + ((oldValue == null) ? 0 : oldValue.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final ModelChangeEvent other = (ModelChangeEvent) obj;
        if (!source.equals(other.source))
            return false;
        if (field == null) {
            if (other.field != null)
                return false;
        } else if (!field.equals(other.field))
            return false;
        if (newValue == null) {
            if (other.newValue != null)
                return false;
        } else if (!newValue.equals(other.newValue))
            return false;
        if (oldValue == null) {
            if (other.oldValue != null)
                return false;
        } else if (!oldValue.equals(other.oldValue))
            return false;
        return true;
    }
}