    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.transform;
    014
    015import org.apache.tapestry5.func.F;
    016import org.apache.tapestry5.func.Predicate;
    017import org.apache.tapestry5.ioc.ObjectLocator;
    018import org.apache.tapestry5.ioc.OperationTracker;
    019import org.apache.tapestry5.ioc.annotations.Inject;
    020import org.apache.tapestry5.ioc.util.ExceptionUtils;
    021import org.apache.tapestry5.model.MutableComponentModel;
    022import org.apache.tapestry5.plastic.PlasticClass;
    023import org.apache.tapestry5.plastic.PlasticField;
    024import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
    025import org.apache.tapestry5.services.transform.InjectionProvider2;
    026import org.apache.tapestry5.services.transform.TransformationSupport;
    027
    028/**
    029 * Performs injection triggered by any field annotated with the {@link org.apache.tapestry5.ioc.annotations.Inject}
    030 * annotation or the {@link javax.inject.Inject} annotation.
    031 *
    032 * The implementation of this worker mostly delegates to a chain of command of {@link InjectionProvider2}.
    033 */
    034public class InjectWorker implements ComponentClassTransformWorker2
    035{
    036    private final ObjectLocator locator;
    037
    038    // Really, a chain of command
    039
    040    private final InjectionProvider2 injectionProvider;
    041
    042    private final OperationTracker tracker;
    043
    044    private final Predicate<PlasticField> MATCHER = new Predicate<PlasticField>()
    045    {
    046        public boolean accept(PlasticField field)
    047        {
    048            return field.hasAnnotation(Inject.class) ||
    049                    field.hasAnnotation(javax.inject.Inject.class);
    050        }
    051    };
    052
    053    public InjectWorker(ObjectLocator locator, InjectionProvider2 injectionProvider, OperationTracker tracker)
    054    {
    055        this.locator = locator;
    056        this.injectionProvider = injectionProvider;
    057        this.tracker = tracker;
    058    }
    059
    060    public void transform(final PlasticClass plasticClass, TransformationSupport support, final MutableComponentModel model)
    061    {
    062        for (final PlasticField field : F.flow(plasticClass.getUnclaimedFields()).filter(MATCHER))
    063        {
    064            final String fieldName = field.getName();
    065
    066            tracker.run(String.format("Injecting field  %s.%s", plasticClass.getClassName(), fieldName), new Runnable()
    067            {
    068                public void run()
    069                {
    070                    try
    071                    {
    072                        boolean success = injectionProvider.provideInjection(field, locator, model);
    073
    074                        if (success)
    075                        {
    076                            field.claim("@Inject");
    077                        }
    078                    } catch (RuntimeException ex)
    079                    {
    080                        throw new RuntimeException(String.format("Error obtaining injected value for field %s.%s: %s", plasticClass.getClassName(), fieldName, ExceptionUtils.toMessage(ex)), ex);
    081                    }
    082                }
    083            });
    084        }
    085    }
    086}