--- /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
+\r
+package org.simantics.utils.datastructures.prioritystack;\r
+\r
+import java.lang.reflect.Array;\r
+import java.lang.reflect.Method;\r
+import java.util.ArrayList;\r
+import java.util.HashMap;\r
+import java.util.LinkedList;\r
+import java.util.List;\r
+import java.util.ListIterator;\r
+import java.util.Map;\r
+\r
+import org.simantics.utils.strings.EString;\r
+import org.simantics.utils.threads.IThreadWorkQueue;\r
+import org.simantics.utils.threads.SyncListenerList;\r
+\r
+\r
+/**\r
+ * Implementation to IPriorityStack.\r
+ * \r
+ * <p>\r
+ * Note!\r
+ * getAllItems() is optimized for result with the penalty of slower add/remove methods. \r
+ *\r
+ * @author Toni Kalajainen\r
+ * @param <E>\r
+ */\r
+public class PriorityStack<E> implements IPriorityStack<E> {\r
+ \r
+ @SuppressWarnings({ "rawtypes" })\r
+ private SyncListenerList<IPriorityStackListener> listeners =\r
+ new SyncListenerList<IPriorityStackListener>(IPriorityStackListener.class);\r
+ \r
+ private LinkedList<E> list = \r
+ new LinkedList<E>(); \r
+ \r
+ private E[] snapshotArray;\r
+ \r
+ private Map<E, Integer> priorities = \r
+ new HashMap<E, Integer>(); \r
+ \r
+ final Class<E> clazz;\r
+ \r
+ public PriorityStack(Class<E> clazz) {\r
+ this.clazz = clazz;\r
+ snapshotArray = createArray(0);\r
+ }\r
+ \r
+ @Override\r
+ public void add(E interactor, int priority) {\r
+ abu:\r
+ synchronized(this) {\r
+ if (list.contains(interactor))\r
+ throw new IllegalArgumentException("InteractorStack already contains item "+interactor);\r
+ \r
+ priorities.put(interactor, priority);\r
+ \r
+ if (list.size()==0)\r
+ {\r
+ list.add(interactor);\r
+ snapshotArray = createSnapshot(list);\r
+ break abu;\r
+ }\r
+ \r
+ ListIterator<E> li = list.listIterator();\r
+ while (li.hasNext()) {\r
+ E i = li.next();\r
+ double w = priorities.get( i );\r
+ if (w > priority) {\r
+ li.previous();\r
+ li.add(interactor);\r
+ snapshotArray = createSnapshot(list);\r
+ break abu;\r
+ }\r
+ }\r
+ list.addLast(interactor);\r
+ snapshotArray = createSnapshot(list);\r
+ }\r
+ fireInteractorAdded(interactor); \r
+ }\r
+ \r
+ @Override\r
+ public boolean remove(E interactor) {\r
+ synchronized(this) {\r
+ if (!priorities.containsKey(interactor)) \r
+ return false;\r
+ priorities.remove(interactor);\r
+ list.remove(interactor);\r
+ snapshotArray = createSnapshot(list);\r
+ }\r
+ fireInteractorRemoved(interactor);\r
+ return true;\r
+ } \r
+\r
+ @Override\r
+ public synchronized Integer getPriority(E interactor) {\r
+ return priorities.get(interactor);\r
+ } \r
+\r
+ @SuppressWarnings({ "unchecked" })\r
+ private E[] createArray(int length)\r
+ {\r
+ return (E[]) Array.newInstance(clazz, length);\r
+ }\r
+\r
+ E[] createSnapshot(List<E> list) {\r
+ E[] result = createArray(list.size());\r
+ int index = 0;\r
+ for (E i : list)\r
+ result[index++] = i; \r
+ return result;\r
+ }\r
+ \r
+ public synchronized int indexOf(E item)\r
+ {\r
+ for (int i=0; i<snapshotArray.length; i++)\r
+ if (snapshotArray[i]==item)\r
+ return i;\r
+ return -1;\r
+ } \r
+ \r
+ @Override\r
+ public synchronized E[] toArray() {\r
+ return snapshotArray;\r
+ }\r
+\r
+ public synchronized <R extends E> R getSingleItem(Class<R> clazz)\r
+ {\r
+ R array[] = getItemsByClass(clazz);\r
+ if (array.length!=1)\r
+ throw new RuntimeException("one "+clazz.getName()+" expected in PriorityStack, got "+array.length);\r
+ return (R) array[0];\r
+ }\r
+ \r
+ @SuppressWarnings("unchecked")\r
+ @Override\r
+ public synchronized <R extends E> R[] getItemsByClass(Class<R> clazz)\r
+ {\r
+ List<E> result = new ArrayList<E>(list.size());\r
+ for (E i : list)\r
+ if (clazz.isAssignableFrom(i.getClass()))\r
+ result.add(i);\r
+ return (R[])result.toArray(createArray(result.size()));\r
+ }\r
+\r
+ private static Method itemAdded = SyncListenerList.getMethod(IPriorityStackListener.class, "itemAdded");\r
+ private void fireInteractorAdded(E interactor)\r
+ {\r
+ listeners.fireEventSync(itemAdded, this, interactor);\r
+ }\r
+ \r
+ private static Method itemRemoved = SyncListenerList.getMethod(IPriorityStackListener.class, "itemRemoved");\r
+ private void fireInteractorRemoved(E interactor)\r
+ {\r
+ listeners.fireEventSync(itemRemoved, this, interactor);\r
+ }\r
+\r
+ @Override\r
+ public synchronized void addStackListener(IPriorityStackListener<E> listener) {\r
+ listeners.add(listener);\r
+ }\r
+\r
+ @Override\r
+ public synchronized void removeStackListener(IPriorityStackListener<E> listener) {\r
+ listeners.remove(listener);\r
+ }\r
+\r
+ @Override\r
+ public synchronized boolean contains(E interactor) {\r
+ return list.contains(interactor);\r
+ }\r
+\r
+ @Override\r
+ public void addStackListener(IThreadWorkQueue thread,\r
+ IPriorityStackListener<E> listener) {\r
+ listeners.add(thread, listener);\r
+ }\r
+\r
+ @Override\r
+ public void removeStackListener(IThreadWorkQueue thread,\r
+ IPriorityStackListener<E> listener) {\r
+ listeners.remove(thread, listener);\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ return EString.implode(snapshotArray, "\n");\r
+ }\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff