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Java example source code file (ShortNameFactory.java)

This example Java source code file (ShortNameFactory.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

annotation, assertionerror, charsequence, class, constructor, elementsource, list, method, namefactory, nosuchmethodexception, providermethod, reflection, securityexception, string, typeliteral, util

The ShortNameFactory.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.grapher;

import com.google.common.base.Joiner;
import com.google.common.collect.Lists;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
import com.google.inject.internal.ProviderMethod;
import com.google.inject.internal.util.StackTraceElements;
import com.google.inject.spi.ElementSource;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.List;

/**
 * Reasonable implementation for {@link NameFactory}. Mostly takes various
 * {@link Object#toString()}s and strips package names out of them so that
 * they'll fit on the graph.
 *
 * @author phopkins@gmail.com (Pete Hopkins)
 */
public class ShortNameFactory implements NameFactory {
  public String getMemberName(Member member) {
    if (member instanceof Constructor) {
      return "<init>";
    } else if (member instanceof Method) {
      return "#" + member.getName() + "(...)";
    } else {
      return member.getName();      
    }
  }

  public String getAnnotationName(Key<?> key) {
    Annotation annotation = key.getAnnotation();
    Class<? extends Annotation> annotationType = key.getAnnotationType();
    if (annotation != null) {
      annotationType = annotation.annotationType();

      String annotationString = annotation.toString();
      String canonicalName = annotationType.getName();
      String simpleName = annotationType.getSimpleName();
 
      return annotationString.replace(canonicalName, simpleName).replace("()", "");
    } else if (annotationType != null) {
      return "@" + annotationType.getSimpleName();
    } else {
      return "";
    }
  }

  public String getClassName(Key<?> key) {
    TypeLiteral<?> typeLiteral = key.getTypeLiteral();
    return stripPackages(typeLiteral.toString());
  }

  public String getInstanceName(Object instance) {
    if (instance instanceof ProviderMethod) {
      return getMethodString(((ProviderMethod<?>) instance).getMethod());
    }

    if (instance instanceof CharSequence) {
      return "\"" + instance + "\"";
    }

    try {
      if (instance.getClass().getMethod("toString").getDeclaringClass().equals(Object.class)) {
        return stripPackages(instance.getClass().getName());
      }
    } catch (SecurityException e) {
      throw new AssertionError(e);
    } catch (NoSuchMethodException e) {
      throw new AssertionError(e);
    }

    return instance.toString();
  }

  /**
   * Returns a name for a Guice "source" object. This will typically be either
   * a {@link StackTraceElement} for when the binding is made to the instance,
   * or a {@link Method} when a provider method is used.
   */
  public String getSourceName(Object source) {
    if (source instanceof ElementSource) {
      source = ((ElementSource) source).getDeclaringSource();
    }
    if (source instanceof Method) {
      source = StackTraceElements.forMember((Method) source);
    }

    if (source instanceof StackTraceElement) {
      return getFileString((StackTraceElement) source);
    }

    return stripPackages(source.toString());
  }

  protected String getFileString(StackTraceElement stackTraceElement) {
    return stackTraceElement.getFileName() + ":" + stackTraceElement.getLineNumber();
  }

  protected String getMethodString(Method method) {
    List<String> paramStrings = Lists.newArrayList();
    for (Class<?> paramType : method.getParameterTypes()) {
      paramStrings.add(paramType.getSimpleName());
    }

    String paramString = Joiner.on(", ").join(paramStrings);
    return "#" + method.getName() + "(" + paramString + ")";
  }

  /**
   * Eliminates runs of lowercase characters and numbers separated by periods.
   * Seems to remove packages from fully-qualified type names pretty well.
   */
  private String stripPackages(String str) {
    return str.replaceAll("(^|[< .\\(])([a-z0-9]+\\.)*", "$1");
  }
}

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