X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.graph.impl%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fgraph%2Fimpl%2FLazyViewpoint.java;h=a760c848a793d0d87fed012a684087e33930d5cb;hp=44bd6a9810f2242ec28a54db85bb67e0c50ba329;hb=0ae2b770234dfc3cbb18bd38f324125cf0faca07;hpb=24e2b34260f219f0d1644ca7a138894980e25b14 diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/LazyViewpoint.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/LazyViewpoint.java index 44bd6a981..a760c848a 100644 --- a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/LazyViewpoint.java +++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/LazyViewpoint.java @@ -1,205 +1,205 @@ -/******************************************************************************* - * 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.graph.impl; - -import java.util.function.Consumer; - -import org.simantics.browsing.ui.BuiltinKeys; -import org.simantics.browsing.ui.DataSource; -import org.simantics.browsing.ui.NodeContext; -import org.simantics.browsing.ui.PrimitiveQueryUpdater; -import org.simantics.browsing.ui.common.viewpoints.ViewpointStub; -import org.simantics.browsing.ui.content.Viewpoint; -import org.simantics.browsing.ui.graph.impl.request.ResourceQuery; -import org.simantics.db.ReadGraph; -import org.simantics.db.exception.DatabaseException; -import org.simantics.db.procedure.Listener; -import org.simantics.utils.datastructures.Pair; - -/** - * Implement {@link #children(ReadGraph)} and {@link #hasChildren(ReadGraph)}. - * - * @author Tuukka Lehtonen - */ -public abstract class LazyViewpoint extends ViewpointStub { - - /** - * Needed for separating childQuery and hasChildQuery from each other in the - * equals sense. - */ - private static final Object CHILDREN = new Object(); - - final private ResourceQuery childQuery; - - final protected PrimitiveQueryUpdater updater; - final protected NodeContext context; - final protected BuiltinKeys.ViewpointKey key; - - /** - * @param graph - * @return - */ - public abstract NodeContext[] children(ReadGraph graph) throws DatabaseException; - - /** - * @param graph - * @return - */ - public abstract Boolean hasChildren(ReadGraph graph) throws DatabaseException; - - /** - * This identity is used to give the back-end graph requests a - * properly unique identity that so that the graph back-end caching - * and graph explorer node context caching work together properly. - * - * Consider having two graph explorer instances that have the same - * configuration (same evaluators) and are showing the same resource from - * the graph database. In this case the requests are actually meant to have - * an identical identity and performing the graph request will simply bind a - * new listener for the one and same request. - * - * @return an additional identity for graph back-end requests to make them - * properly unique - */ - public Object getIdentity() { - return key; - } - - public LazyViewpoint(final PrimitiveQueryUpdater updater, NodeContext context, BuiltinKeys.ViewpointKey key) { - - assert updater != null; - assert context != null; - assert key != null; - - this.updater = updater; - this.context = context; - this.key = key; - - this.childQuery = new ResourceQuery(Pair.make(getIdentity(), CHILDREN), context) { - - @Override - public NodeContext[] perform(ReadGraph graph) throws DatabaseException { - return children(graph); - } - - @Override - public String toString() { - return LazyViewpoint.this.toString() + "[CHILDREN]"; - } - - }; - - } - - private Listener createListener() { - - return new Listener() { - - boolean executed = false; - boolean disposed = false; - - @Override - public void execute(NodeContext[] result) { - replaceChildrenResult(result); - executed = true; - } - - @Override - public boolean isDisposed() { - if(disposed) return true; - - if((updater.isDisposed() || !updater.isShown(context)) && executed) { - children = Viewpoint.PENDING_CHILDREN; - disposed = true; - return true; - } else { - return false; - } - - } - - public void exception(Throwable t) { - System.out.print("LazyViewpoint.childQuery failed: "); - t.printStackTrace(); - } - - @Override - public String toString() { - return "LazyViewpoint[" + System.identityHashCode(LazyViewpoint.this) + "].childProcedure"; - } - - }; - - } - - public NodeContext getContext() { - return context; - } - - @Override - public NodeContext[] getChildren() { - - if (children == Viewpoint.PENDING_CHILDREN) { - DataSource source = updater.getDataSource(ReadGraph.class); - final Listener childProcedure = createListener(); - source.schedule(new Consumer() { - @Override - public void accept(ReadGraph source) { - source.asyncRequest(childQuery, childProcedure); - } - }); - } - - return children; - - } - - @Override - public Boolean getHasChildren() { - return getChildren().length > 0; - } - - protected void replaceChildrenResult(NodeContext[] result) { - setChildren(updater, result); - updater.scheduleReplace(context, key, this); - } - - /** - * @param - * @param clazz - * @return input of the specified class - * @throws ClassCastException if the input class does not match the - * specified class - * @throws NullPointerException if the input is null - */ - @SuppressWarnings("unchecked") - protected T getInput(Class clazz) throws ClassCastException { - Object o = context.getConstant(BuiltinKeys.INPUT); - if (o == null) - throw new NullPointerException("null input"); - return (T) o; - } - - /** - * @param - * @param clazz - * @return null if input is null or if the class does not match - */ - @SuppressWarnings("unchecked") - protected T tryGetInput(Class clazz) { - Object o = context.getConstant(BuiltinKeys.INPUT); - if (o != null && clazz.isInstance(o)) - return (T) o; - return null; - } - -} +/******************************************************************************* + * 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.graph.impl; + +import java.util.function.Consumer; + +import org.simantics.browsing.ui.BuiltinKeys; +import org.simantics.browsing.ui.DataSource; +import org.simantics.browsing.ui.NodeContext; +import org.simantics.browsing.ui.PrimitiveQueryUpdater; +import org.simantics.browsing.ui.common.viewpoints.ViewpointStub; +import org.simantics.browsing.ui.content.Viewpoint; +import org.simantics.browsing.ui.graph.impl.request.ResourceQuery; +import org.simantics.db.ReadGraph; +import org.simantics.db.exception.DatabaseException; +import org.simantics.db.procedure.Listener; +import org.simantics.utils.datastructures.Pair; + +/** + * Implement {@link #children(ReadGraph)} and {@link #hasChildren(ReadGraph)}. + * + * @author Tuukka Lehtonen + */ +public abstract class LazyViewpoint extends ViewpointStub { + + /** + * Needed for separating childQuery and hasChildQuery from each other in the + * equals sense. + */ + private static final Object CHILDREN = new Object(); + + final private ResourceQuery childQuery; + + final protected PrimitiveQueryUpdater updater; + final protected NodeContext context; + final protected BuiltinKeys.ViewpointKey key; + + /** + * @param graph + * @return + */ + public abstract NodeContext[] children(ReadGraph graph) throws DatabaseException; + + /** + * @param graph + * @return + */ + public abstract Boolean hasChildren(ReadGraph graph) throws DatabaseException; + + /** + * This identity is used to give the back-end graph requests a + * properly unique identity that so that the graph back-end caching + * and graph explorer node context caching work together properly. + * + * Consider having two graph explorer instances that have the same + * configuration (same evaluators) and are showing the same resource from + * the graph database. In this case the requests are actually meant to have + * an identical identity and performing the graph request will simply bind a + * new listener for the one and same request. + * + * @return an additional identity for graph back-end requests to make them + * properly unique + */ + public Object getIdentity() { + return key; + } + + public LazyViewpoint(final PrimitiveQueryUpdater updater, NodeContext context, BuiltinKeys.ViewpointKey key) { + + assert updater != null; + assert context != null; + assert key != null; + + this.updater = updater; + this.context = context; + this.key = key; + + this.childQuery = new ResourceQuery(Pair.make(getIdentity(), CHILDREN), context) { + + @Override + public NodeContext[] perform(ReadGraph graph) throws DatabaseException { + return children(graph); + } + + @Override + public String toString() { + return LazyViewpoint.this.toString() + "[CHILDREN]"; + } + + }; + + } + + private Listener createListener() { + + return new Listener() { + + boolean executed = false; + boolean disposed = false; + + @Override + public void execute(NodeContext[] result) { + replaceChildrenResult(result); + executed = true; + } + + @Override + public boolean isDisposed() { + if(disposed) return true; + + if((updater.isDisposed() || !updater.isShown(context)) && executed) { + children = Viewpoint.PENDING_CHILDREN; + disposed = true; + return true; + } else { + return false; + } + + } + + public void exception(Throwable t) { + System.out.print("LazyViewpoint.childQuery failed: "); + t.printStackTrace(); + } + + @Override + public String toString() { + return "LazyViewpoint[" + System.identityHashCode(LazyViewpoint.this) + "].childProcedure"; + } + + }; + + } + + public NodeContext getContext() { + return context; + } + + @Override + public NodeContext[] getChildren() { + + if (children == Viewpoint.PENDING_CHILDREN) { + DataSource source = updater.getDataSource(ReadGraph.class); + final Listener childProcedure = createListener(); + source.schedule(new Consumer() { + @Override + public void accept(ReadGraph source) { + source.asyncRequest(childQuery, childProcedure); + } + }); + } + + return children; + + } + + @Override + public Boolean getHasChildren() { + return getChildren().length > 0; + } + + protected void replaceChildrenResult(NodeContext[] result) { + setChildren(updater, result); + updater.scheduleReplace(context, key, this); + } + + /** + * @param + * @param clazz + * @return input of the specified class + * @throws ClassCastException if the input class does not match the + * specified class + * @throws NullPointerException if the input is null + */ + @SuppressWarnings("unchecked") + protected T getInput(Class clazz) throws ClassCastException { + Object o = context.getConstant(BuiltinKeys.INPUT); + if (o == null) + throw new NullPointerException("null input"); + return (T) o; + } + + /** + * @param + * @param clazz + * @return null if input is null or if the class does not match + */ + @SuppressWarnings("unchecked") + protected T tryGetInput(Class clazz) { + Object o = context.getConstant(BuiltinKeys.INPUT); + if (o != null && clazz.isInstance(o)) + return (T) o; + return null; + } + +}