| /******************************************************************************* |
| * Copyright (c) 2008, 2010 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 org.eclipse.core.runtime.Assert; |
| |
| /** |
| * @since 2.0 |
| */ |
| 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; //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| } |