+/*******************************************************************************\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.datastructures.slice;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class ValueRange {\r
+\r
+ public static final ValueRange NO_RANGE = new ValueRange(0, Integer.MAX_VALUE);\r
+ public static final ValueRange EMPTY = new ValueRange(0, 0);\r
+ public static final ValueRange ONE = new ValueRange(0, 1);\r
+ public static final ValueRange TWO = new ValueRange(0, 2);\r
+\r
+ private final int start;\r
+ private final int size;\r
+\r
+ public static ValueRange make(int size) {\r
+ if (size == 0)\r
+ return EMPTY;\r
+ else if (size == 1)\r
+ return ONE;\r
+ else if (size == 2)\r
+ return TWO;\r
+ return new ValueRange(size);\r
+ }\r
+\r
+ public static ValueRange make(int start, int size) {\r
+ if (start == 0) {\r
+ if (size == 0)\r
+ return EMPTY;\r
+ else if (size == 1)\r
+ return ONE;\r
+ else if (size == 2)\r
+ return TWO;\r
+ }\r
+ return new ValueRange(start, size);\r
+ }\r
+\r
+ private ValueRange(int size) {\r
+ this(0, size);\r
+ }\r
+\r
+ private ValueRange(int start, int size) {\r
+ if (start < 0)\r
+ throw new IllegalArgumentException("negative range start: " + start);\r
+ if (size < 0)\r
+ throw new IllegalArgumentException("negative range size: " + size);\r
+ this.start = start;\r
+ this.size = size;\r
+ }\r
+\r
+ public boolean isEmpty() {\r
+ return size == 0;\r
+ }\r
+\r
+ public boolean isSingle() {\r
+ return size == 1;\r
+ }\r
+\r
+ public int start() {\r
+ return start;\r
+ }\r
+\r
+ public int end() {\r
+ return start + size;\r
+ }\r
+\r
+ public int size() {\r
+ return size;\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ if (isEmpty())\r
+ return "[]";\r
+ if (isSingle())\r
+ return "[" + start + "]";\r
+ return "[" + start + "-" + (start + size - 1) + "]";\r
+ }\r
+\r
+ public String toString(int offset) {\r
+ if (isEmpty())\r
+ return "[]";\r
+ if (isSingle())\r
+ return "[" + (start+offset) + "]";\r
+ return "[" + (start+offset) + "-" + (start + size - 1 + offset) + "]";\r
+ }\r
+\r
+ @Override\r
+ public int hashCode() {\r
+ final int prime = 31;\r
+ int result = 1;\r
+ result = prime * result + size;\r
+ result = prime * result + start;\r
+ return result;\r
+ }\r
+\r
+ @Override\r
+ public boolean equals(Object obj) {\r
+ if (this == obj)\r
+ return true;\r
+ if (obj == null)\r
+ return false;\r
+ if (getClass() != obj.getClass())\r
+ return false;\r
+ ValueRange other = (ValueRange) obj;\r
+ return size == other.size && start == other.start;\r
+ }\r
+\r
+// public ChildReference toChildReference() {\r
+// if (isEmpty())\r
+// throw new UnsupportedOperationException("cannot create a value reference for an empty range");\r
+// if (isSingle())\r
+// return new IndexReference(start);\r
+// //throw new RangeReference(start, start+size-1);\r
+// throw new UnsupportedOperationException("cannot create a value reference for a range with cardinality > 1");\r
+// }\r
+\r
+ /**\r
+ * @return a Simantics Databoard child reference string describing this range.\r
+ */\r
+ public String toChildReferenceString() {\r
+ if (isEmpty())\r
+ throw new UnsupportedOperationException("cannot create a value reference for an empty range");\r
+ StringBuilder sb = new StringBuilder();\r
+ if (isSingle())\r
+ return sb.append("i-").append(start).toString();\r
+ // TODO: proposal: http://dev.simantics.org/index.php/Talk:Databoard_Specification\r
+ return sb.append("r-").append(start).append('-').append(start+size-1).toString();\r
+ }\r
+\r
+}\r