| // *************************************************************************************************************************** |
| // * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file * |
| // * distributed with this work for additional information regarding copyright ownership. The ASF licenses this file * |
| // * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance * |
| // * with the License. You may obtain a copy of the License at * |
| // * * |
| // * http://www.apache.org/licenses/LICENSE-2.0 * |
| // * * |
| // * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an * |
| // * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * |
| // * specific language governing permissions and limitations under the License. * |
| // *************************************************************************************************************************** |
| package org.apache.juneau.utils; |
| |
| import java.lang.reflect.*; |
| |
| import org.apache.juneau.*; |
| import org.apache.juneau.reflect.*; |
| |
| /** |
| * Utility class for quick lookup of class metadata instances. |
| * |
| * <p> |
| * Class instances are created once and then cached. |
| * |
| * <p> |
| * Classes must have a constructor that takes in a single argument. |
| */ |
| public class MetadataMap { |
| |
| private Class<?>[] classes = new Class<?>[0]; |
| private Object[] metadata = new Object[0]; |
| |
| |
| /** |
| * Constructor. |
| * |
| * @param c The metadata class to create. |
| * @param constructorArg The argument needed to construct the metadata. |
| * @return The cached metadata object. |
| */ |
| @SuppressWarnings("unchecked") |
| public <T> T get(Class<T> c, Object constructorArg) { |
| for (int i = 0; i < classes.length; i++) |
| if (classes[i] == c) |
| return (T)metadata[i]; |
| synchronized(this) { |
| for (int i = 0; i < classes.length; i++) |
| if (classes[i] == c) |
| return (T)metadata[i]; |
| Class<?>[] classes2 = new Class<?>[classes.length + 1]; |
| Object[] metadata2 = new Object[classes.length + 1]; |
| for (int i = 0; i < classes.length; i++) { |
| classes2[i] = classes[i]; |
| metadata2[i] = metadata[i]; |
| } |
| Object o = null; |
| try { |
| for (Constructor<?> con : c.getConstructors()) { |
| Class<?>[] pt = con.getParameterTypes(); |
| if (pt.length == 1 && ClassInfo.of(pt[0]).isParentOf(constructorArg.getClass())) { |
| o = con.newInstance(constructorArg); |
| break; |
| } |
| } |
| } catch (InvocationTargetException e) { |
| Throwable t = e.getTargetException(); |
| if (t instanceof RuntimeException) |
| throw (RuntimeException)t; |
| throw new RuntimeException(t); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| if (o == null) |
| throw new BeanRuntimeException(c, |
| "Could not find a constructor on class with a parameter to handle type {0}", constructorArg.getClass()); |
| classes2[classes.length] = c; |
| metadata2[classes.length] = o; |
| classes = classes2; |
| metadata = metadata2; |
| return (T)o; |
| } |
| } |
| } |