001 /**
002 Licensed to the Apache Software Foundation (ASF) under one or more
003 contributor license agreements. See the NOTICE file distributed with
004 this work for additional information regarding copyright ownership.
005 The ASF licenses this file to You under the Apache License, Version 2.0
006 (the "License"); you may not use this file except in compliance with
007 the License. You may obtain a copy of the License at
008
009 http://www.apache.org/licenses/LICENSE-2.0
010
011 Unless required by applicable law or agreed to in writing, software
012 distributed under the License is distributed on an "AS IS" BASIS,
013 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 See the License for the specific language governing permissions and
015 limitations under the License.
016 */
017 package org.apache.commons.inject.impl;
018
019 import org.apache.commons.inject.api.IBinding;
020 import org.apache.commons.inject.api.IInjector;
021 import org.apache.commons.inject.api.IKey;
022 import org.apache.commons.inject.api.IPoint;
023 import org.apache.commons.inject.api.IProvider;
024 import org.apache.commons.inject.api.NoSuchBindingException;
025 import org.apache.commons.inject.impl.AbstractBindingSet.MappedKey;
026 import org.apache.commons.inject.impl.AbstractBindingSet.ReducedKey;
027 import org.apache.commons.inject.impl.bind.DefaultBinding;
028
029 /**
030 * Default implementation of an {@link IInjector injector}.
031 */
032 public class DefaultInjector extends AbstractInjector {
033 private final ImmutableBindingSet bindings;
034
035 public DefaultInjector(ImmutableBindingSet pBindings) {
036 bindings = pBindings;
037 }
038
039 protected <T> IBinding<T> getBinding(IKey<T> pKey) {
040 synchronized(bindings) {
041 return bindings.getBinding(pKey);
042 }
043 }
044
045 protected <T> IBinding<T> requireBinding(IKey<T> pKey) {
046 synchronized(bindings) {
047 IBinding<T> binding;
048 binding = bindings.getBinding(pKey);
049 if (binding == null) {
050 final IMutableBindingSource bindingSource = getBindingSource();
051 final Class<T> cl = pKey.getType();
052 final IPoint<T> point = Introspector.getInstance().getPoint(cl, bindingSource);
053 final IProvider<T> provider = Introspector.getInstance().getProvider(cl, point, bindingSource);
054 binding = new DefaultBinding<T>(provider, point);
055 final ReducedKey<T> rkey = new ReducedKey<T>(cl, pKey.getName());
056 final MappedKey<T> key = new MappedKey<T>(cl, pKey.getName(), null, null);
057 bindings.add(rkey, key, binding);
058 }
059 return binding;
060 }
061 }
062
063 protected IMutableBindingSource getBindingSource() {
064 return new IMutableBindingSource() {
065 @Override
066 public <T> IBinding<T> requireBinding(IKey<T> pKey, String pCause) {
067 final IBinding<T> binding = bindings.getBinding(pKey);
068 if (binding == null) {
069 throw new NoSuchBindingException("No binding registered for key: " + pKey);
070 }
071 return binding;
072 }
073
074 };
075 }
076
077 }