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package com.sun.beans.finder;

This is utility class that provides basic functionality to find an auxiliary class for a JavaBean specified by its type.
Author:Sergey A. Malenkov
Since:1.7
/** * This is utility class that provides basic functionality * to find an auxiliary class for a JavaBean specified by its type. * * @since 1.7 * * @author Sergey A. Malenkov */
class InstanceFinder<T> { private static final String[] EMPTY = { }; private final Class<? extends T> type; private final boolean allow; private final String suffix; private volatile String[] packages; InstanceFinder(Class<? extends T> type, boolean allow, String suffix, String... packages) { this.type = type; this.allow = allow; this.suffix = suffix; this.packages = packages.clone(); } public String[] getPackages() { return this.packages.clone(); } public void setPackages(String... packages) { this.packages = (packages != null) && (packages.length > 0) ? packages.clone() : EMPTY; } public T find(Class<?> type) { if (type == null) { return null; } String name = type.getName() + this.suffix; T object = instantiate(type, name); if (object != null) { return object; } if (this.allow) { object = instantiate(type, null); if (object != null) { return object; } } int index = name.lastIndexOf('.') + 1; if (index > 0) { name = name.substring(index); } for (String prefix : this.packages) { object = instantiate(type, prefix, name); if (object != null) { return object; } } return null; } @SuppressWarnings("deprecation") protected T instantiate(Class<?> type, String name) { if (type != null) { try { if (name != null) { type = ClassFinder.findClass(name, type.getClassLoader()); } if (this.type.isAssignableFrom(type)) { @SuppressWarnings("unchecked") T tmp = (T) type.newInstance(); return tmp; } } catch (Exception exception) { // ignore any exceptions } } return null; } protected T instantiate(Class<?> type, String prefix, String name) { return instantiate(type, prefix + '.' + name); } }