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Unify Configuration- and InstancePreferences into common super-class
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110 changes: 110 additions & 0 deletions
110
...ox.preferences/src/org/eclipse/core/internal/preferences/SingletonEclipsePreferences.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2004, 2023 IBM Corporation and others. | ||
| * | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| * | ||
| * Contributors: | ||
| * IBM Corporation - initial API and implementation | ||
| * Hannes Wellmann - Unify Configuration- and InstancePreferences into common super-class | ||
| *******************************************************************************/ | ||
| package org.eclipse.core.internal.preferences; | ||
|
|
||
| import java.util.Set; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import org.eclipse.core.runtime.IPath; | ||
| import org.eclipse.core.runtime.preferences.IEclipsePreferences; | ||
|
|
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| public abstract class SingletonEclipsePreferences extends EclipsePreferences { | ||
| // cached values | ||
| String qualifier; | ||
| private int segmentCount; | ||
| private IPath location; | ||
| private IEclipsePreferences loadLevel; | ||
| private Set<String> loadedNodes; | ||
| private AtomicBoolean initialized; | ||
|
|
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| SingletonEclipsePreferences(EclipsePreferences parent, String name, Set<String> loadedNodes, | ||
| AtomicBoolean initialized) { | ||
| super(parent, name); | ||
| this.loadedNodes = loadedNodes; | ||
| this.initialized = initialized; | ||
|
|
||
| initializeChildren(); | ||
|
|
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| // cache the segment count | ||
| String path = absolutePath(); | ||
| segmentCount = getSegmentCount(path); | ||
| if (segmentCount < 2) { | ||
| return; | ||
| } | ||
| // cache the qualifier | ||
| qualifier = getSegment(path, 1); | ||
| } | ||
|
|
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| abstract IPath getBaseLocation(); | ||
|
|
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| @Override | ||
| protected boolean isAlreadyLoaded(IEclipsePreferences node) { | ||
| return loadedNodes.contains(node.name()); | ||
| } | ||
|
|
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| @Override | ||
| protected void loaded() { | ||
| loadedNodes.add(name()); | ||
| } | ||
|
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| @Override | ||
| protected IPath getLocation() { | ||
| if (location == null && qualifier != null) { | ||
| location = computeLocation(getBaseLocation(), qualifier); | ||
| } | ||
| return location; | ||
| } | ||
|
|
||
| /* | ||
| * Return the node at which these preferences are loaded/saved. | ||
| */ | ||
| @Override | ||
| protected IEclipsePreferences getLoadLevel() { | ||
| if (loadLevel == null) { | ||
| if (qualifier == null) | ||
| return null; | ||
| // Make it relative to this node rather than navigating to it from the root. | ||
| // Walk backwards up the tree starting at this node. | ||
| // This is important to avoid a chicken/egg thing on startup. | ||
| IEclipsePreferences node = this; | ||
| for (int i = 2; i < segmentCount; i++) | ||
| node = (IEclipsePreferences) node.parent(); | ||
| loadLevel = node; | ||
| } | ||
| return loadLevel; | ||
| } | ||
|
|
||
| /* | ||
| * Initialize the children for the root of this node. Store the names as keys in | ||
| * the children table so we can lazily load them later. | ||
| */ | ||
| protected void initializeChildren() { | ||
| if (initialized.get() || parent == null) | ||
| return; | ||
| try { | ||
| synchronized (this) { | ||
| IPath baseLocation = getBaseLocation(); | ||
| if (baseLocation == null) { | ||
| return; | ||
| } | ||
| for (String n : computeChildren(baseLocation)) { | ||
| addChild(n, null); | ||
| } | ||
| } | ||
| } finally { | ||
| initialized.set(true); | ||
| } | ||
| } | ||
|
|
||
| } |
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