--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.utils.threads.internal;\r
+\r
+/**\r
+ * A generic Pair (2-tuple) structure for containing two object instances of\r
+ * chosen types.\r
+ * \r
+ * @param <T1> type of first element\r
+ * @param <T2> type of second element\r
+ */\r
+public final class Pair<T1, T2> {\r
+ public final T1 first;\r
+ public final T2 second;\r
+ private final int hash;\r
+\r
+ public Pair(T1 first, T2 second) {\r
+ assert(first != null);\r
+ assert(second != null);\r
+ \r
+ this.first = first;\r
+ this.second = second;\r
+ this.hash = makeHash();\r
+ }\r
+ \r
+ @Override\r
+ public boolean equals(Object obj) {\r
+ if (obj == null)\r
+ return false;\r
+ if (!(obj.getClass().equals(this.getClass())))\r
+ return false;\r
+ Pair<?, ?> other = (Pair<?, ?>) obj;\r
+ if (other.first != first && !other.first.equals(first))\r
+ return false;\r
+ if (other.second != second && !other.second.equals(second))\r
+ return false;\r
+ return true;\r
+ }\r
+ \r
+ @Override\r
+ public int hashCode() {\r
+ return hash;\r
+ }\r
+ \r
+ @Override\r
+ public String toString() {\r
+ return "<"+first+", "+second+">";\r
+ }\r
+ \r
+ private int makeHash() {\r
+ return first.hashCode() ^ second.hashCode()*7;\r
+ }\r
+}\r