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Diffstat (limited to 'branches/sca-java-2.0-M4/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/injection/FieldInjector.java')
-rw-r--r-- | branches/sca-java-2.0-M4/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/injection/FieldInjector.java | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/branches/sca-java-2.0-M4/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/injection/FieldInjector.java b/branches/sca-java-2.0-M4/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/injection/FieldInjector.java new file mode 100644 index 0000000000..dd454be7c5 --- /dev/null +++ b/branches/sca-java-2.0-M4/modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/injection/FieldInjector.java @@ -0,0 +1,67 @@ +/* + * 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.tuscany.sca.implementation.java.injection; + +import java.lang.reflect.Field; +import java.security.AccessController; +import java.security.PrivilegedAction; + +import org.apache.tuscany.sca.core.factory.ObjectCreationException; +import org.apache.tuscany.sca.core.factory.ObjectFactory; + +/** + * Injects a value created by an {@link org.apache.tuscany.sca.core.factory.ObjectFactory} on a given field + * + * @version $Rev$ $Date$ + */ +public class FieldInjector<T> implements Injector<T> { + + private final Field field; + + private final ObjectFactory<?> objectFactory; + + /** + * Create an injector and have it use the given <code>ObjectFactory</code> to inject a value on the instance using + * the reflected <code>Field</code> + */ + public FieldInjector(Field pField, ObjectFactory<?> objectFactory) { + field = pField; + // Allow privileged access to set accessibility. Requires ReflectPermission + // in security policy. + AccessController.doPrivileged(new PrivilegedAction<Object>() { + public Object run() { + field.setAccessible(true); // ignore Java accessibility + return null; + } + }); + + this.objectFactory = objectFactory; + } + + /** + * Inject a new value on the given instance + */ + public void inject(T instance) throws ObjectCreationException { + try { + field.set(instance, objectFactory.getInstance()); + } catch (IllegalAccessException e) { + throw new ObjectCreationException("Field is not accessible [" + field + "]", e); + } + } +} |