X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.common%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fcommon%2FEvaluatorDataImpl.java;fp=bundles%2Forg.simantics.browsing.ui.common%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fcommon%2FEvaluatorDataImpl.java;h=03bceb6e639cab5c8da44c704b5612f0b7d83a7b;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08
diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/EvaluatorDataImpl.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/EvaluatorDataImpl.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.browsing.ui.common;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Deque;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * The default implementation of EvaluatorData
.
+ *
+ *
+ * Evaluator
s can be added by invoking
+ * {@link #addEvaluator(Class, org.simantics.browsing.ui.common.EvaluatorData.Evaluator)
+ * or {@link #addEvaluators(Class, Collection)}. The specified
+ * Evaluator
or collection of Evaluator
s are bound to
+ * the specified Java class. The reason for such a binding is that the
+ * implementation of {@link #get(Object)} is based on comparing the input object
+ * class to the classes specified to the addEvaluator
methods. The
+ * comparison works so that an Evaluator
will be added to the
+ * result of {@link #get(Object)} if:
+ *
+ *
+ * - the input object is assignable to the
Evaluator
's class
+ *
+ *
+ *
+ * This implementation keeps a Class
→Evaluator
+ * cache of previous results thus quickly producing results for a given input
+ * object class after the result has been cached. Note that there is no way to
+ * reset the cache, i.e. this class is intended to be initialized once, used
+ * after that and finally thrown away. Do not add evaluators once in use, they
+ * may or may not be reflected in the results.
+ *
+ *
+ * @author Tuukka Lehtonen
+ */
+public class EvaluatorDataImpl implements EvaluatorData {
+
+ private static final boolean DEBUG = false;
+
+ /**
+ * Contains only the original evaluator associations made directly by the
+ * client. This is used for initializing the evaluators
cache
+ * for different inputs.
+ */
+ protected HashMap, Collection> originals = new HashMap, Collection>();
+
+ /**
+ * A cache that is only modified by
+ * {@link #findAndCacheEvaluatorsForClass(Class)}. This map is not filled in
+ * by client's initialization efforts.
+ */
+ protected HashMap, Collection> evaluators = new HashMap, Collection>();
+
+ private Object browseContext;
+
+ public EvaluatorDataImpl() {
+ }
+
+ public void setBrowseContext(Object browseContext) {
+ this.browseContext = browseContext;
+ }
+
+ @Override
+ public Evaluator newEvaluator() {
+ return new EvaluatorImpl();
+ }
+
+ private synchronized void addEvaluator(HashMap, Collection> map, Class> clazz, Evaluator eval) {
+ Collection es = map.get(clazz);
+ if (es == null) {
+ es = new ArrayList();
+ map.put(clazz, es);
+ }
+ es.add(eval);
+ if (DEBUG) {
+// new Exception().printStackTrace();
+ System.out.println("EvaluatorDataImpl: ADDED Evaluator: " + clazz + ": " + eval);
+ }
+ }
+
+ private synchronized void addEvaluators(HashMap, Collection> map, Class> clazz, Collection evals) {
+ Collection es = map.get(clazz);
+ if (es == null) {
+ es = new ArrayList();
+ map.put(clazz, es);
+ }
+ es.addAll(evals);
+ if (DEBUG)
+ System.out.println("EvaluatorDataImpl: ADDED Evaluators: " + clazz + ": " + evals);
+ }
+
+ public synchronized void addEvaluator(Class> clazz, Evaluator eval) {
+ addEvaluator(originals, clazz, eval);
+ }
+
+ public synchronized void addEvaluators(Class> clazz, Collection evals) {
+ addEvaluators(originals, clazz, evals);
+ }
+
+ @Override
+ public Collection get(Object object) {
+ Class> clazz = object.getClass();
+ Collection evaluator = evaluators.get(clazz);
+ if (evaluator != null) {
+ if (DEBUG)
+ System.out.println("EvaluatorDataImpl: get cached: " + clazz + ": " + evaluator);
+ return evaluator;
+ }
+
+ Collection evals = findAndCacheEvaluatorsForClass(clazz);
+ if (DEBUG) {
+ System.out.println("EvaluatorDataImpl: get: " + clazz + ": " + evals);
+ if (evals.isEmpty()) {
+ System.out.println("EvaluatorDataImpl: no match, evaluators available:");
+ for (Map.Entry, Collection> e : evaluators.entrySet()) {
+ if (!e.getValue().isEmpty())
+ System.out.println(" " + e.getKey() + " : " + e.getValue());
+ }
+ }
+ }
+ return evals;
+ }
+
+ private synchronized Collection findAndCacheEvaluatorsForClass(Class> clazz) {
+ if (DEBUG)
+ System.out.println("EvaluatorDataImpl: caching evaluators for " + clazz);
+ Set> usedClasses = new HashSet>();
+ Set used = new HashSet();
+ Collection result = new ArrayList();
+ Deque> fifo = new ArrayDeque>();
+ fifo.add(clazz);
+ while (!fifo.isEmpty()) {
+ Class> c = fifo.removeFirst();
+ if (!usedClasses.add(c))
+ continue;
+ Class> superClass = c.getSuperclass();
+ if (superClass != null)
+ fifo.addLast(superClass);
+ for (Class> i : c.getInterfaces())
+ fifo.addLast(i);
+ Collection evals = originals.get(c);
+ if (evals != null)
+ for (Evaluator eval : evals)
+ if (used.add(eval))
+ result.add(eval);
+ }
+ if (result.isEmpty()) {
+ result = Collections.emptyList();
+ }
+ evaluators.put(clazz, result);
+ return result;
+ }
+
+ @Override
+ public Collection enumEvaluators() {
+ Collection result = new ArrayList();
+ for (Map.Entry, Collection> entry : originals.entrySet()) {
+ result.add(new EvaluatorEntryImpl(entry.getKey(), entry.getValue()));
+ }
+ return result;
+ }
+
+ static class EvaluatorEntryImpl implements EvaluatorEntry {
+ private final Class> clazz;
+ private final Collection evaluators;
+
+ public EvaluatorEntryImpl(Class> clazz, Collection evaluators) {
+ this.clazz = clazz;
+ this.evaluators = evaluators;
+ }
+
+ @Override
+ public Class> getClazz() {
+ return clazz;
+ }
+
+ @Override
+ public Collection getEvaluators() {
+ return evaluators;
+ }
+
+ @Override
+ public String toString() {
+ return "class " + clazz.getSimpleName();
+ }
+ }
+
+ @Override
+ public T getBrowseContext() {
+ return (T)browseContext;
+ }
+
+}