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The Core Camel Java DSL based router
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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.camel.model;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

import org.apache.camel.Processor;
import org.apache.camel.processor.ThrowExceptionProcessor;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.ObjectHelper;

/**
 * Throws an exception
 */
@Metadata(label = "error")
@XmlRootElement(name = "throwException")
@XmlAccessorType(XmlAccessType.FIELD)
public class ThrowExceptionDefinition extends NoOutputDefinition {
    @XmlAttribute
    private String ref;
    @XmlAttribute
    private String message;
    @XmlTransient
    private Exception exception;
    @XmlAttribute
    private String exceptionType;
    @XmlTransient
    private Class exceptionClass;

    public ThrowExceptionDefinition() {
    }

    @Override
    public String toString() {
        return "ThrowException[" + description() + "]";
    }

    protected String description() {
        return exception != null ? exception.getClass().getCanonicalName() : "ref:" + ref;
    }

    @Override
    public String getLabel() {
        return "throwException[" + description() + "]";
    }
    
    @Override
    public Processor createProcessor(RouteContext routeContext) {
        if (ref != null && exception == null) {
            this.exception = routeContext.getCamelContext().getRegistry().lookupByNameAndType(ref, Exception.class);
        }

        if (exceptionType != null && exceptionClass == null) {
            try {
                this.exceptionClass = routeContext.getCamelContext().getClassResolver().resolveMandatoryClass(exceptionType, Exception.class);
            } catch (ClassNotFoundException e) {
                throw ObjectHelper.wrapRuntimeCamelException(e);
            }
        }

        if (exception == null && exceptionClass == null) {
            throw new IllegalArgumentException("exception or exceptionClass/exceptionType must be configured on: " + this);
        }
        return new ThrowExceptionProcessor(exception, exceptionClass, message);
    }

    public String getRef() {
        return ref;
    }

    /**
     * Reference to the exception instance to lookup from the registry to throw
     */
    public void setRef(String ref) {
        this.ref = ref;
    }

    public Exception getException() {
        return exception;
    }

    public void setException(Exception exception) {
        this.exception = exception;
    }

    public String getMessage() {
        return message;
    }

    /**
     * To create a new exception instance and use the given message as caused message (supports simple language)
     */
    public void setMessage(String message) {
        this.message = message;
    }

    public String getExceptionType() {
        return exceptionType;
    }

    /**
     * The class of the exception to create using the message.
     *
     * @see #setMessage(String)
     */
    public void setExceptionType(String exceptionType) {
        this.exceptionType = exceptionType;
    }

    public Class getExceptionClass() {
        return exceptionClass;
    }

    /**
     * The class of the exception to create using the message.
     *
     * @see #setMessage(String)
     */
    public void setExceptionClass(Class exceptionClass) {
        this.exceptionClass = exceptionClass;
    }
}