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Java example source code file (SingleFieldInjector.java)

This example Java source code file (SingleFieldInjector.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assertionerror, bindingimpl, dependency, errorsexception, field, illegalaccessexception, injectionpoint, internalcontext, object, reflection, singlefieldinjector, singlememberinjector

The SingleFieldInjector.java Java example source code

/**
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed 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 com.google.inject.internal;

import com.google.inject.internal.InjectorImpl.JitLimitation;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.InjectionPoint;

import java.lang.reflect.Field;

/**
 * Sets an injectable field.
 */
final class SingleFieldInjector implements SingleMemberInjector {
  final Field field;
  final InjectionPoint injectionPoint;
  final Dependency<?> dependency;
  final BindingImpl<?> binding;

  public SingleFieldInjector(InjectorImpl injector, InjectionPoint injectionPoint, Errors errors)
      throws ErrorsException {
    this.injectionPoint = injectionPoint;
    this.field = (Field) injectionPoint.getMember();
    this.dependency = injectionPoint.getDependencies().get(0);

    // Ewwwww...
    field.setAccessible(true);
    binding = injector.getBindingOrThrow(dependency.getKey(), errors, JitLimitation.NO_JIT);
  }

  public InjectionPoint getInjectionPoint() {
    return injectionPoint;
  }

  public void inject(Errors errors, InternalContext context, Object o) {
    errors = errors.withSource(dependency);

    Dependency previous = context.pushDependency(dependency, binding.getSource());
    try {
      Object value = binding.getInternalFactory().get(errors, context, dependency, false);
      field.set(o, value);
    } catch (ErrorsException e) {
      errors.withSource(injectionPoint).merge(e.getErrors());
    } catch (IllegalAccessException e) {
      throw new AssertionError(e); // a security manager is blocking us, we're hosed
    } finally {
      context.popStateAndSetDependency(previous);
    }
  }
}

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