optimized way to carry a set of types around that you may or may not want to resolve

org.aspectj.matcher/src/org/aspectj/weaver/ResolvableTypeList.java

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+/* *******************************************************************
+ * Copyright (c) 2009 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     initial implementation 
+ * ******************************************************************/
+package org.aspectj.weaver;
+
+/**
+ * Carries an array of unresolved types - will resolve them on demand. Can be used where currently the entire array gets resolved
+ * and a ResolvedType array is passed on. Depending on the situation there may not be a need to resolve all the entries so this can
+ * perform better. Note: the array elements are resolved in place, so the caller should not be surprised if elements and resolved
+ * after the type list has been used.
+ * 
+ * @author Andy Clement
+ */
+public class ResolvableTypeList {
+
+	public int length;
+	private World world;
+	private UnresolvedType[] types;
+
+	public ResolvableTypeList(World world, UnresolvedType[] unresolvedTypes) {
+		length = unresolvedTypes.length;
+		types = unresolvedTypes;
+		this.world = world;
+	}
+
+	public ResolvedType getResolved(int nameIndex) {
+		UnresolvedType ut = types[nameIndex];
+		if (!(ut instanceof ResolvedType)) {
+			types[nameIndex] = world.resolve(ut);
+			return (ResolvedType) types[nameIndex];
+		} else {
+			return (ResolvedType) ut;
+		}
+	}
+}