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%2Fstate%2FIdentifiedStatePersistor.java;fp=bundles%2Forg.simantics.browsing.ui.common%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fcommon%2Fstate%2FIdentifiedStatePersistor.java;h=0a417bd389c32ca8b2368888c3fb3ebef06fe2dc;hp=0000000000000000000000000000000000000000;hb=97e8b055b8ad16f1d799c81898fee075780a5a83;hpb=72d52b5910e1ed0141b6768ef700e7321ac05553

diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/state/IdentifiedStatePersistor.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/state/IdentifiedStatePersistor.java
new file mode 100644
index 000000000..0a417bd38
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/state/IdentifiedStatePersistor.java
@@ -0,0 +1,106 @@
+package org.simantics.browsing.ui.common.state;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import org.simantics.browsing.ui.ExplorerState;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.StatePersistor;
+import org.simantics.databoard.util.StringUtil;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class IdentifiedStatePersistor implements StatePersistor {
+
+	private static final Logger LOGGER = LoggerFactory.getLogger(IdentifiedStatePersistor.class);
+
+	protected final String id;
+
+	public IdentifiedStatePersistor(String id) {
+		this.id = id;
+	}
+
+	@Override
+	public ExplorerState deserialize(File stateLocation, NodeContext root) {
+		return stateLocation == null ? ExplorerState.EMPTY
+				: deserialize(getMementoPath(stateLocation, root));
+	}
+
+	@Override
+	public void serialize(File stateLocation, NodeContext root, ExplorerState state) {
+		if (stateLocation == null || root == null)
+			return;
+		try {
+			GraphExplorerStateBean bean = toStateBean(state, root);
+			Path memento = getMementoPath(stateLocation, root);
+			if (bean != null && memento != null)
+				Files.write(memento, bean.serialize());
+		} catch (Throwable t) {
+			LOGGER.error("Failed to serialize ExplorerState " + state, t);
+		}
+	}
+
+	protected ExplorerState deserialize(Path path) {
+		if (path == null || !Files.exists(path))
+			return ExplorerState.EMPTY;
+		try {
+			GraphExplorerStateBean stateBean = new GraphExplorerStateBean();
+			stateBean.deserialize( Files.readAllBytes(path) );
+			return toState(stateBean);
+		} catch (Throwable t) {
+			LOGGER.error("Failed to deserialize ExplorerState from " + path, t);
+			return ExplorerState.EMPTY;
+		}
+	}
+
+	protected NodeContext[] toNodeContexts(GraphExplorerStateNodeBean[] beans) throws Exception {
+		return NodeContext.NONE;
+	}
+
+	protected List<NodeContext> toNodeContextList(GraphExplorerStateNodeBean[] beans) throws Exception {
+		return beans.length == 0 ? Collections.<NodeContext>emptyList()
+				: Arrays.asList(toNodeContexts(beans));
+	}
+
+	protected GraphExplorerStateNodeBean[] toNodeBeans(NodeContext[] contexts) {
+		return GraphExplorerStateNodeBean.NONE;
+	}
+
+	protected ExplorerState toState(GraphExplorerStateBean stateBean) throws Exception {
+		return new ExplorerState(
+				toNodeContexts(stateBean.topNodePath),
+				stateBean.topNodePathChildIndexes,
+				toNodeContextList(stateBean.expandedNodes),
+				stateBean.columnWidths);
+	}
+
+	/**
+	 * @param state
+	 *            the {@link ExplorerState} to transform into a
+	 *            {@link GraphExplorerStateBean}
+	 * @param root
+	 *            the input root node context that was used to initialize the
+	 *            explorer state
+	 * @return
+	 */
+	protected GraphExplorerStateBean toStateBean(ExplorerState state, NodeContext root) {
+		GraphExplorerStateBean ib = new GraphExplorerStateBean();
+		ib.topNodePath = toNodeBeans(state.topNodePath);
+		ib.topNodePathChildIndexes = state.topNodePathChildIndex;
+		ib.expandedNodes = toNodeBeans(state.expandedNodes.toArray(NodeContext.NONE));
+		ib.columnWidths = state.columnWidths;
+		return ib;
+	}
+
+	protected Path getMementoPath(File stateLocation, NodeContext root) {
+		return stateLocation.toPath().resolve(StringUtil.escapeToFileName(id) + ".ge");
+	}
+
+}
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