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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.rapiddweller.common.debug;

import com.rapiddweller.common.SystemInfo;

/**
 * Wrapper class for resources that are monitored.
 * It stores the monitored object itself and its allocation stack trace.
 * Created: 14.04.2011 17:22:56
 *
 * @author Volker Bergmann
 * @since 0.5.8
 */
public class MonitoredResource {

  /**
   * The Resource.
   */
  final Object resource;
  /**
   * The Registration trace.
   */
  final StackTraceElement[] registrationTrace;

  /**
   * Instantiates a new Monitored resource.
   *
   * @param resource          the resource
   * @param registrationTrace the registration trace
   */
  public MonitoredResource(Object resource, StackTraceElement[] registrationTrace) {
    this.resource = resource;
    this.registrationTrace = registrationTrace;
  }

  private static String toString(StackTraceElement[] trace) {
    StringBuilder builder = new StringBuilder();
    boolean first = true;
    for (StackTraceElement element : trace) {
      appendTraceElement(element, first, builder);
      first = false;
    }
    return builder.toString();
  }

  private static void appendTraceElement(StackTraceElement element, boolean first, StringBuilder builder) {
    builder.append(SystemInfo.getLineSeparator());
    builder.append("\t");
    if (!first) {
      builder.append("at ");
    }
    builder.append(element.getClassName()).append('.').append(element.getMethodName());
    if (element.getLineNumber() > 0) {
      builder.append(" (Line ").append(element.getLineNumber()).append(")");
    }
  }

  @Override
  public String toString() {
    return "Monitored Object: " + resource.toString() + SystemInfo.getLineSeparator() +
        "Registration stack:" +
        toString(registrationTrace);
  }

}