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Java example source code file (AbstractProcessor.java)

This example Java source code file (AbstractProcessor.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

abstractprocessor, boolean, defaultelementvisitor, element, errors, injectorimpl, injectorshell, iterator, list, override, util

The AbstractProcessor.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.spi.DefaultElementVisitor;
import com.google.inject.spi.Element;

import java.util.Iterator;
import java.util.List;

/**
 * Abstract base class for creating an injector from module elements.
 *
 * <p>Extending classes must return {@code true} from any overridden
 * {@code visit*()} methods, in order for the element processor to remove the
 * handled element.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 */
abstract class AbstractProcessor extends DefaultElementVisitor<Boolean> {

  protected Errors errors;
  protected InjectorImpl injector;

  protected AbstractProcessor(Errors errors) {
    this.errors = errors;
  }

  public void process(Iterable<InjectorShell> isolatedInjectorBuilders) {
    for (InjectorShell injectorShell : isolatedInjectorBuilders) {
      process(injectorShell.getInjector(), injectorShell.getElements());
    }
  }

  public void process(InjectorImpl injector, List<Element> elements) {
    Errors errorsAnyElement = this.errors;
    this.injector = injector;
    try {
      for (Iterator<Element> i = elements.iterator(); i.hasNext(); ) {
        Element element = i.next();
        this.errors = errorsAnyElement.withSource(element.getSource());
        Boolean allDone = element.acceptVisitor(this);
        if (allDone) {
          i.remove();
        }
      }
    } finally {
      this.errors = errorsAnyElement;
      this.injector = null;
    }
  }
  
  @Override
  protected Boolean visitOther(Element element) {
    return false;
  }
}

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