added a builder to parse files with eclipse's build mechanisms

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / core / BufferManager.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/BufferManager.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/BufferManager.java
new file mode 100644 (file)
index 0000000..511d041
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/BufferManager.java
@@ -0,0 +1,107 @@
+/*******************************************************************************
+ * 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 net.sourceforge.phpdt.internal.core;
+
+import java.util.Enumeration;
+
+import net.sourceforge.phpdt.core.IBuffer;
+import net.sourceforge.phpdt.core.IBufferFactory;
+import net.sourceforge.phpdt.core.IJavaElement;
+import net.sourceforge.phpdt.core.IOpenable;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IResource;
+
+
+/**
+ * The buffer manager manages the set of open buffers.
+ * It implements an LRU cache of buffers.
+ */
+public class BufferManager implements IBufferFactory {
+
+       protected static BufferManager DEFAULT_BUFFER_MANAGER;
+
+       /**
+        * LRU cache of buffers. The key and value for an entry
+        * in the table is the identical buffer.
+        */
+       protected OverflowingLRUCache openBuffers = new BufferCache(60);
+
+/**
+ * Creates a new buffer manager.
+ */
+public BufferManager() {
+}
+/**
+ * Adds a buffer to the table of open buffers.
+ */
+protected void addBuffer(IBuffer buffer) {
+       openBuffers.put(buffer.getOwner(), buffer);
+}
+/**
+ * @see IBufferFactory#createBuffer(IOpenable)
+ */
+public IBuffer createBuffer(IOpenable owner) {
+       IJavaElement element = (IJavaElement)owner;
+       IResource resource = element.getResource();
+       return 
+               new Buffer(
+                       resource instanceof IFile ? (IFile)resource : null, 
+                       owner, 
+                       element.isReadOnly());
+}
+
+/**
+ * Returns the open buffer associated with the given owner,
+ * or <code>null</code> if the owner does not have an open
+ * buffer associated with it.
+ */
+public IBuffer getBuffer(IOpenable owner) {
+       return (IBuffer)openBuffers.get(owner);
+}
+/**
+ * Returns the default buffer manager.
+ */
+public synchronized static BufferManager getDefaultBufferManager() {
+       if (DEFAULT_BUFFER_MANAGER == null) {
+               DEFAULT_BUFFER_MANAGER = new BufferManager();
+       }
+       return DEFAULT_BUFFER_MANAGER;
+}
+/**
+ * Returns the default buffer factory.
+ */
+public IBufferFactory getDefaultBufferFactory() {
+       return this;
+}
+/**
+ * Returns an enumeration of all open buffers.
+ * <p> 
+ * The <code>Enumeration</code> answered is thread safe.
+ *
+ * @see OverflowingLRUCache
+ * @return Enumeration of IBuffer
+ */
+public Enumeration getOpenBuffers() {
+       synchronized (openBuffers) {
+               openBuffers.shrink();
+               return openBuffers.elements();
+       }
+}
+
+
+/**
+ * Removes a buffer from the table of open buffers.
+ */
+protected void removeBuffer(IBuffer buffer) {
+       openBuffers.remove(buffer.getOwner());
+}
+}