home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (ModuleSource.java)

This example Java source code file (ModuleSource.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

inmemorystacktraceelement, list, modulesource, stacktraceelement, string, util

The ModuleSource.java Java example source code

/**
 * Copyright (C) 2013 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.spi;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.inject.Module;
import com.google.inject.internal.util.StackTraceElements;
import com.google.inject.internal.util.StackTraceElements.InMemoryStackTraceElement;

import java.util.List;

/**
 * Associated to a {@link Module module}, provides the module class name, the parent module {@link
 * ModuleSource source}, and the call stack that ends just before the module {@link
 * Module#configure(Binder) configure(Binder)} method invocation.
 */
final class ModuleSource {

  /**
   * The class name of module that this {@link ModuleSource} associated to.
   */
  private final String moduleClassName;

  /**
   * The parent {@link ModuleSource module source}.
   */
  private final ModuleSource parent;

  /**
   * The chunk of call stack that starts from the parent module {@link Module#configure(Binder)
   * configure(Binder)} call and ends just before the module {@link Module#configure(Binder)
   * configure(Binder)} method invocation. For a module without a parent module the chunk starts
   * from the bottom of call stack. The array is non-empty if stack trace collection is on.
   */
  private final InMemoryStackTraceElement[] partialCallStack;

  /**
   * Creates a new {@link ModuleSource} with a {@literal null} parent.
   * @param module the corresponding module
   * @param partialCallStack the chunk of call stack that starts from the parent module {@link
   * Module#configure(Binder) configure(Binder)} call and ends just before the module {@link
   * Module#configure(Binder) configure(Binder)} method invocation
   */
  ModuleSource(Object module, StackTraceElement[] partialCallStack) {
    this(null, module, partialCallStack);
  }

 /**
   * Creates a new {@link ModuleSource} Object.
   * @param parent the parent module {@link ModuleSource source}
   * @param module the corresponding module
   * @param partialCallStack the chunk of call stack that starts from the parent module {@link
   * Module#configure(Binder) configure(Binder)} call and ends just before the module {@link
   * Module#configure(Binder) configure(Binder)} method invocation
   */
  private ModuleSource(
      /* @Nullable */ ModuleSource parent, Object module, StackTraceElement[] partialCallStack) {
    Preconditions.checkNotNull(module, "module cannot be null.");
    Preconditions.checkNotNull(partialCallStack, "partialCallStack cannot be null.");
    this.parent = parent;
    this.moduleClassName = module.getClass().getName();
    this.partialCallStack = StackTraceElements.convertToInMemoryStackTraceElement(partialCallStack);
  }

  /**
   * Returns the corresponding module class name.
   *
   * @see Class#getName()
   */
  String getModuleClassName() {
    return moduleClassName;
  }

  /**
   * Returns the chunk of call stack that starts from the parent module {@link
   * Module#configure(Binder) configure(Binder)} call and ends just before the module {@link
   * Module#configure(Binder) configure(Binder)} method invocation. The return array is non-empty
   * only if stack trace collection is on.
   */
  StackTraceElement[] getPartialCallStack() {
    return StackTraceElements.convertToStackTraceElement(partialCallStack);
  }

  /**
   * Returns the size of partial call stack if stack trace collection is on otherwise zero.
   */
  int getPartialCallStackSize() {
    return partialCallStack.length;
  }

  /**
   * Creates and returns a child {@link ModuleSource} corresponding to the {@link Module module}.
   * @param module the corresponding module
   * @param partialCallStack the chunk of call stack that starts from the parent module {@link
   * Module#configure(Binder) configure(Binder)} call and ends just before the module {@link
   * Module#configure(Binder) configure(Binder)} method invocation
   */
  ModuleSource createChild(Object module, StackTraceElement[] partialCallStack) {
    return new ModuleSource(this, module, partialCallStack);
  }

  /**
   * Returns the parent module {@link ModuleSource source}.
   */
  ModuleSource getParent() {
    return parent;
  }

  /**
   * Returns the class names of modules in this module source. The first element (index 0) is filled
   * by this object {@link #getModuleClassName()}. The second element is filled by the parent's
   * {@link #getModuleClassName()} and so on.
   */
  List<String> getModuleClassNames() {
    ImmutableList.Builder<String> classNames = ImmutableList.builder();
    ModuleSource current = this;
    while (current != null) {
      String className = current.moduleClassName;
      classNames.add(className);
      current = current.parent;
    }
    return classNames.build();
  }

  /**
   * Returns the size of {@link ModuleSource ModuleSources} chain (all parents) that ends at this
   * object.
   */
  int size() {
    if (parent == null) {
      return 1;
    }
    return parent.size() + 1;
  }

  /**
   * Returns the size of call stack that ends just before the module {@link Module#configure(Binder)
   * configure(Binder)} method invocation (see {@link #getStackTrace()}).
   */
  int getStackTraceSize() {
    if (parent == null) {
      return partialCallStack.length;
    }
    return parent.getStackTraceSize() + partialCallStack.length;
  }

  /**
   * Returns the full call stack that ends just before the module {@link Module#configure(Binder)
   * configure(Binder)} method invocation. The return array is non-empty if stack trace collection
   * on.
   */
  StackTraceElement[] getStackTrace() {
    int stackTraceSize = getStackTraceSize();
    StackTraceElement[] callStack = new StackTraceElement[stackTraceSize];
    int cursor = 0;
    ModuleSource current = this;
    while (current != null) {
      StackTraceElement[] chunk =
          StackTraceElements.convertToStackTraceElement(current.partialCallStack);
      int chunkSize = chunk.length;
      System.arraycopy(chunk, 0, callStack, cursor, chunkSize);
      current = current.parent;
      cursor = cursor + chunkSize;
    }
    return callStack;
  }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java ModuleSource.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.