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/*
 * Copyright (C) 2006 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 org.elasticsearch.common.inject.spi;

import org.elasticsearch.common.inject.Binder;
import org.elasticsearch.common.inject.internal.Errors;
import org.elasticsearch.common.inject.internal.SourceProvider;

import java.util.Collections;
import java.util.List;
import java.util.Objects;

/**
 * An error message and the context in which it occurred. Messages are usually created internally by
 * Guice and its extensions. Messages can be created explicitly in a module using {@link
 * org.elasticsearch.common.inject.Binder#addError(Throwable) addError()} statements:
 * 
 *     try {
 *       bindPropertiesFromFile();
 *     } catch (IOException e) {
 *       addError(e);
 *     }
* * @author [email protected] (Bob Lee) */ public final class Message implements Element { private final String message; private final Throwable cause; private final List sources; /** * @since 2.0 */ public Message(List sources, String message, Throwable cause) { this.sources = Collections.unmodifiableList(sources); this.message = Objects.requireNonNull(message, "message"); this.cause = cause; } public Message(Object source, String message) { this(Collections.singletonList(source), message, null); } public Message(Object source, Throwable cause) { this(Collections.singletonList(source), null, cause); } public Message(String message) { this(Collections.emptyList(), message, null); } @Override public String getSource() { return sources.isEmpty() ? SourceProvider.UNKNOWN_SOURCE.toString() : Errors.convert(sources.get(sources.size() - 1)).toString(); } /** * @since 2.0 */ public List getSources() { return sources; } /** * Gets the error message text. */ public String getMessage() { return message; } /** * @since 2.0 */ @Override public T acceptVisitor(ElementVisitor visitor) { return visitor.visit(this); } /** * Returns the throwable that caused this message, or {@code null} if this * message was not caused by a throwable. * * @since 2.0 */ public Throwable getCause() { return cause; } @Override public String toString() { return message; } @Override public int hashCode() { return message.hashCode(); } @Override public boolean equals(Object o) { if (!(o instanceof Message)) { return false; } Message e = (Message) o; return message.equals(e.message) && Objects.equals(cause, e.cause) && sources.equals(e.sources); } /** * @since 2.0 */ @Override public void applyTo(Binder binder) { binder.withSource(getSource()).addError(this); } }