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Java example source code file (ConfigurationException.java)

This example Java source code file (ConfigurationException.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

can't, collection, configurationexception, guice, immutableset, object, override, runtimeexception, string, suppresswarnings, util

The ConfigurationException.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;

import static com.google.common.base.Preconditions.checkState;

import com.google.common.collect.ImmutableSet;
import com.google.inject.internal.Errors;
import com.google.inject.spi.Message;

import java.util.Collection;

/**
 * Thrown when a programming error such as a misplaced annotation, illegal binding, or unsupported
 * scope is found. Clients should catch this exception, log it, and stop execution.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 * @since 2.0
 */
public final class ConfigurationException extends RuntimeException {

  private final ImmutableSet<Message> messages;
  private Object partialValue = null;

  /** Creates a ConfigurationException containing {@code messages}. */
  public ConfigurationException(Iterable<Message> messages) {
    this.messages = ImmutableSet.copyOf(messages); 
    initCause(Errors.getOnlyCause(this.messages));
  }

  /** Returns a copy of this configuration exception with the specified partial value. */
  public ConfigurationException withPartialValue(Object partialValue) {
    checkState(this.partialValue == null,
        "Can't clobber existing partial value %s with %s", this.partialValue, partialValue);
    ConfigurationException result = new ConfigurationException(messages);
    result.partialValue = partialValue;
    return result;
  }

  /** Returns messages for the errors that caused this exception. */
  public Collection<Message> getErrorMessages() {
    return messages;
  }

  /**
   * Returns a value that was only partially computed due to this exception. The caller can use
   * this while collecting additional configuration problems.
   *
   * @return the partial value, or {@code null} if none was set. The type of the partial value is
   *      specified by the throwing method.
   */
  @SuppressWarnings("unchecked") // this is *extremely* unsafe. We trust the caller here.
  public <E> E getPartialValue() {
    return (E) partialValue;
  }

  @Override public String getMessage() {
    return Errors.format("Guice configuration errors", messages);
  }

  private static final long serialVersionUID = 0;
}

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