com.cloudera.api.ApiErrorMessage.java Source code

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Here is the source code for com.cloudera.api.ApiErrorMessage.java

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// Licensed to Cloudera, Inc. under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  Cloudera, Inc. licenses this file
// to you 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.cloudera.api;

import com.google.common.base.Objects;
import com.google.common.collect.Lists;

import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

/**
 * View object for errors. We expose the error message and messages of
 * any nested throwables.
 */
@XmlRootElement(name = "error")
@XmlType(propOrder = { "message", "causes" })
public class ApiErrorMessage {

    private String message;
    private List<String> causes;

    /**
     * Empty constructor, for JAX-B.
     */
    public ApiErrorMessage() {
        this.message = null;
        this.causes = null;
    }

    /**
     * Constructs a new ApiErrorMessage that provides information about
     * the given error. Its message and any underlying causes are saved.
     *
     * @param t The error being wrapped.
     */
    public ApiErrorMessage(Throwable t) {
        this.message = t.getMessage();
        List<String> causeMessages = Lists.newLinkedList();
        if (t.getCause() != null) {
            do {
                t = t.getCause();
                String errorMessage = t.getMessage();
                if (errorMessage != null) {
                    causeMessages.add(errorMessage);
                }
            } while (t.getCause() != null);
        }
        if (!causeMessages.isEmpty()) {
            causes = causeMessages;
        } else {
            causes = null;
        }
    }

    /**
     * Constructs a new ApiErrorMessage with the given error message, and no
     * causes.
     *
     * @param message The error message.
     */
    public ApiErrorMessage(String message) {
        this.message = message;
        this.causes = null;
    }

    public String toString() {
        return Objects.toStringHelper(this).addValue(message).toString();
    }

    @XmlElement
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @XmlElementWrapper
    public List<String> getCauses() {
        return causes;
    }

    public void setCauses(List<String> causes) {
        this.causes = causes;
    }

}