From: aclement <aclement>
Date: Wed, 22 Feb 2006 15:13:48 +0000 (+0000)
Subject: optimization: encapsulates lazy unpacking of annotations
X-Git-Tag: POST_MEMORY_CHANGES~43
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=90dec5326ec88e2895fddeccf70aba2064802ddb;p=aspectj.git

optimization: encapsulates lazy unpacking of annotations
---

diff --git a/weaver/src/org/aspectj/weaver/AnnotationsForMemberHolder.java b/weaver/src/org/aspectj/weaver/AnnotationsForMemberHolder.java
new file mode 100644
index 000000000..67221f680
--- /dev/null
+++ b/weaver/src/org/aspectj/weaver/AnnotationsForMemberHolder.java
@@ -0,0 +1,95 @@
+/* *******************************************************************
+ * Copyright (c) 2006 Contributors
+ * 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: 
+ *     Andy Clement IBM     initial implementation 
+ * ******************************************************************/
+package org.aspectj.weaver;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Can store annotations for any member and ensures they are resolved/unpacked as lazily as possible.
+ * The set of annotations is unpacked *once* then discarded, so ensure all annotations have been
+ * added via 'addAnnotation()' before calling the public accessor
+ * methods 'hasAnnotation/getAnnotations/getAnnotationTypes'
+ * 
+ * @author AndyClement
+ */
+public class AnnotationsForMemberHolder {
+
+	private boolean annotationTypesCorrect = false; // guard for lazy initialization of annotationTypes
+	private ResolvedType[] annotationTypes;
+	private boolean annotationXsCorrect = false;
+	private AnnotationX[] annotationXs;
+	public List /*AnnotationAJ*/ annotations   = null;
+	private World world;
+	
+	public AnnotationsForMemberHolder(World w) {
+		this.world = w;
+	}
+	
+	public AnnotationX[] getAnnotations() {
+		ensureAnnotationXsUnpacked();
+		return annotationXs;
+	}
+
+	public ResolvedType[] getAnnotationTypes() {
+		ensureAnnotationsUnpacked();
+		return annotationTypes;
+	}
+	
+	public boolean hasAnnotation(UnresolvedType ofType) {
+		ensureAnnotationsUnpacked();
+		for (int i = 0; i < annotationTypes.length; i++) {
+			if (annotationTypes[i].equals(ofType)) return true;
+		}
+		return false;
+	}
+	
+	private void ensureAnnotationXsUnpacked() {
+		if (annotationTypesCorrect && annotationXsCorrect) return;
+		ensureAnnotationsUnpacked();
+		if (annotations==null) {
+			annotationXs = AnnotationX.NONE;
+		} else {
+			annotationXs = new AnnotationX[annotations.size()];
+			int pos = 0;
+			for (Iterator iter = annotations.iterator(); iter.hasNext();) {
+				AnnotationAJ element = (AnnotationAJ) iter.next();
+				annotationXs[pos++] = new AnnotationX(element,world);
+			}
+			annotations=null; // finished with
+		}
+		annotationXsCorrect = true;
+	}
+	
+	
+  private void ensureAnnotationsUnpacked() {
+	if (annotationTypesCorrect) return;
+	if (annotations==null) {
+		annotationTypes = ResolvedType.NONE;
+	} else {
+		annotationTypes = new ResolvedType[annotations.size()];
+		int pos = 0;
+		for (Iterator iter = annotations.iterator(); iter.hasNext();) {
+			AnnotationAJ element = (AnnotationAJ) iter.next();
+			annotationTypes[pos++] = world.resolve(UnresolvedType.forSignature(element.getTypeSignature()));
+		}
+	}
+	annotationTypesCorrect = true;
+  }
+
+	public void addAnnotation(AnnotationAJ oneAnnotation) {
+		if (annotations==null) annotations = new ArrayList();
+		annotations.add(oneAnnotation);
+	}
+
+}