add ProxyFactory that delegates to discovered service providers
git-svn-id: https://svn.apache.org/repos/asf/commons/proper/proxy/branches/version-2.0-work@966779 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/java/org/apache/commons/proxy2/DefaultProxyFactory.java b/core/src/main/java/org/apache/commons/proxy2/DefaultProxyFactory.java
new file mode 100644
index 0000000..42cae4e
--- /dev/null
+++ b/core/src/main/java/org/apache/commons/proxy2/DefaultProxyFactory.java
@@ -0,0 +1,116 @@
+/*
+ * 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.commons.proxy2;
+
+import java.util.Arrays;
+import java.util.ServiceLoader;
+
+/**
+ * {@link ProxyFactory} implementation that delegates to the first discovered
+ * {@link ProxyFactory} service provider that {@link #canProxy(Class...)}.
+ *
+ * @author Matt Benson
+ */
+class DefaultProxyFactory implements ProxyFactory {
+ /** Shared instance */
+ static final DefaultProxyFactory INSTANCE = new DefaultProxyFactory();
+
+ private static final ServiceLoader<ProxyFactory> SERVICES = ServiceLoader
+ .load(ProxyFactory.class);
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public boolean canProxy(Class<?>... proxyClasses) {
+ for (ProxyFactory proxyFactory : SERVICES) {
+ if (proxyFactory.canProxy(proxyClasses)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createDelegatorProxy(ObjectProvider<?> delegateProvider,
+ Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createDelegatorProxy(
+ delegateProvider, proxyClasses);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createDelegatorProxy(ClassLoader classLoader,
+ ObjectProvider<?> delegateProvider, Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createDelegatorProxy(
+ classLoader, delegateProvider, proxyClasses);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createInterceptorProxy(Object target, Interceptor interceptor,
+ Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createInterceptorProxy(
+ target, interceptor, proxyClasses);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createInterceptorProxy(ClassLoader classLoader, Object target,
+ Interceptor interceptor, Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createInterceptorProxy(
+ classLoader, target, interceptor, proxyClasses);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createInvokerProxy(Invoker invoker, Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createInvokerProxy(invoker,
+ proxyClasses);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public <T> T createInvokerProxy(ClassLoader classLoader, Invoker invoker,
+ Class<?>... proxyClasses) {
+ return getCapableProxyFactory(proxyClasses).createInvokerProxy(
+ classLoader, invoker, proxyClasses);
+ }
+
+ private ProxyFactory getCapableProxyFactory(Class<?>... proxyClasses) {
+ for (ProxyFactory proxyFactory : SERVICES) {
+ if (proxyFactory.canProxy(proxyClasses)) {
+ return proxyFactory;
+ }
+ }
+ throw new IllegalArgumentException("Could not proxy "
+ + Arrays.toString(proxyClasses));
+ }
+}
diff --git a/core/src/main/java/org/apache/commons/proxy2/ProxyUtils.java b/core/src/main/java/org/apache/commons/proxy2/ProxyUtils.java
index 17b62fb..b133eb5 100644
--- a/core/src/main/java/org/apache/commons/proxy2/ProxyUtils.java
+++ b/core/src/main/java/org/apache/commons/proxy2/ProxyUtils.java
@@ -79,7 +79,7 @@
*/
public static Object createNullObject(ProxyFactory proxyFactory, Class<?>[] proxyClasses)
{
- return proxyFactory.createInvokerProxy(new NullInvoker(), proxyClasses);
+ return proxyFactory.createInvokerProxy(NullInvoker.INSTANCE, proxyClasses);
}
/**
@@ -92,7 +92,7 @@
*/
public static Object createNullObject(ProxyFactory proxyFactory, ClassLoader classLoader, Class<?>[] proxyClasses)
{
- return proxyFactory.createInvokerProxy(classLoader, new NullInvoker(), proxyClasses);
+ return proxyFactory.createInvokerProxy(classLoader, NullInvoker.INSTANCE, proxyClasses);
}
/**
@@ -204,4 +204,11 @@
method.getParameterTypes().length == 0;
}
+ /**
+ * Get a {@link ProxyFactory} that delegates to discoverable {@link ProxyFactory} service providers.
+ * @return {@link ProxyFactory}
+ */
+ public static ProxyFactory proxyFactory() {
+ return DefaultProxyFactory.INSTANCE;
+ }
}
