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/*******************************************************************************
 * Copyright (c) 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.provisional.p2.engine;

import org.eclipse.core.runtime.Assert;

public class PropertyOperand extends Operand {
  private final Object first;
  private final Object second;
  private final String key;

  /**
   * Creates a new operand that represents replacing a property value
   * with another.  At least one of the provided property values must be
   * non-null.
   * 
   * @param key The key of the property being modified
   * @param first The property value being removed, or <code>null</code>
   * @param second The property value being added, or <code>null</code>
   */
  public PropertyOperand(String key, Object first, Object second) {
    //the operand must specify have a key and have at least one non-null value
    Assert.isTrue(key != null && (first != null || second != null));
    this.first = first;
    this.second = second;
    this.key = key;
  }

  public Object first() {
    return first;
  }

  public Object second() {
    return second;
  }

  public String getKey() {
    return key;
  }

  public String toString() {
    return key + " = " + first + " --> " + second; //$NON-NLS-1$ //$NON-NLS-2$
  }
}
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