Refactoring of subscribers and resource variants

1 files changed, 113 insertions, 0 deletions

diff --git a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ThreeWayBaseTree.java b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ThreeWayBaseTree.java
new file mode 100644
index 000000000..0a3b5c200
--- /dev/null
+++ b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ThreeWayBaseTree.java
@@ -0,0 +1,113 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.team.internal.core.subscribers;
+
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.team.core.TeamException;
+import org.eclipse.team.core.variants.IResourceVariant;
+import org.eclipse.team.core.variants.ResourceVariantByteStore;
+import org.eclipse.team.core.variants.ResourceVariantTree;
+import org.eclipse.team.core.variants.ThreeWaySubscriber;
+
+/**
+ * Allow access to the base resource variants but do not support refresh
+ * or modification.
+ */
+public final class ThreeWayBaseTree extends ResourceVariantTree {
+
+	private ThreeWaySubscriber subscriber;
+
+	/*
+	 * A resource variant byte store that accesses the base bytes from a three-way
+	 * synchronizer. The modification methods are disabled as the base should
+	 * only be modified in the synchronizer directly.
+	 */
+	static class BaseResourceVariantByteStore extends ResourceVariantByteStore {
+		private ThreeWaySubscriber subscriber;
+		public BaseResourceVariantByteStore(ThreeWaySubscriber subscriber) {
+			this.subscriber = subscriber;
+		}
+		public void dispose() {
+			// Nothing to do
+		}
+		public byte[] getBytes(IResource resource) throws TeamException {
+			return subscriber.getSynchronizer().getBaseBytes(resource);
+		}
+		public boolean setBytes(IResource resource, byte[] bytes) throws TeamException {
+			// Base bytes are set directly in the synchronizer
+			return false;
+		}
+		public boolean flushBytes(IResource resource, int depth) throws TeamException {
+			// Base bytes are flushed directly in the synchronizer
+			return false;
+		}
+		public boolean deleteBytes(IResource resource) throws TeamException {
+			// Base bytes are deleted directly in the synchronizer
+			return false;
+		}
+		public IResource[] members(IResource resource) throws TeamException {
+			return subscriber.getSynchronizer().members(resource);
+		}
+	}
+	
+	/**
+	 * Create a base resource variant tree that accesses the base bytes
+	 * from a three-way synchronizer.
+	 * @param subscriber the three-way subscriber
+	 */
+	public ThreeWayBaseTree(ThreeWaySubscriber subscriber) {
+		super(new BaseResourceVariantByteStore(subscriber));
+		this.subscriber = subscriber;
+	}
+	
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.AbstractResourceVariantTree#refresh(org.eclipse.core.resources.IResource[], int, org.eclipse.core.runtime.IProgressMonitor)
+	 */
+	public IResource[] refresh(IResource[] resources, int depth, IProgressMonitor monitor) throws TeamException {
+		return new IResource[0];
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.AbstractResourceVariantTree#fetchMembers(org.eclipse.team.core.synchronize.IResourceVariant, org.eclipse.core.runtime.IProgressMonitor)
+	 */
+	protected IResourceVariant[] fetchMembers(IResourceVariant variant, IProgressMonitor progress) throws TeamException {
+		// Refresh not supported
+		return new IResourceVariant[0];
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.AbstractResourceVariantTree#fetchVariant(org.eclipse.core.resources.IResource, int, org.eclipse.core.runtime.IProgressMonitor)
+	 */
+	protected IResourceVariant fetchVariant(IResource resource, int depth, IProgressMonitor monitor) throws TeamException {
+		// Refresh not supported
+		return null;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.IResourceVariantTree#roots()
+	 */
+	public IResource[] roots() {
+		return getSubscriber().roots();
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.internal.core.subscribers.caches.IResourceVariantTree#getResourceVariant(org.eclipse.core.resources.IResource)
+	 */
+	public IResourceVariant getResourceVariant(IResource resource) throws TeamException {
+		return getSubscriber().getResourceVariant(resource, getByteStore().getBytes(resource));
+	}
+
+	private ThreeWaySubscriber getSubscriber() {
+		return subscriber;
+	}
+	
+}