Apache CXF example source code file (FaultOutInterceptor.java)

This example Apache CXF source code file (FaultOutInterceptor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Apache CXF tags/keywords

class, class, datawriter, dom, exception, exception, fault, fault, faultinfo, faultoutinterceptor, log, log, logging, no_acccess_fault_info, object, reflection, xmlstreamwriter

The Apache CXF FaultOutInterceptor.java source code

/**
 * 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.cxf.interceptor;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.xml.stream.XMLStreamWriter;

import org.w3c.dom.Node;

import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.databinding.DataBinding;
import org.apache.cxf.databinding.DataWriter;
import org.apache.cxf.frontend.FaultInfoException;
import org.apache.cxf.message.Message;
import org.apache.cxf.phase.AbstractPhaseInterceptor;
import org.apache.cxf.phase.Phase;
import org.apache.cxf.service.Service;
import org.apache.cxf.service.model.BindingFaultInfo;
import org.apache.cxf.service.model.BindingOperationInfo;
import org.apache.cxf.service.model.FaultInfo;
import org.apache.cxf.service.model.MessagePartInfo;
import org.apache.cxf.staxutils.W3CDOMStreamWriter;

public class FaultOutInterceptor extends AbstractPhaseInterceptor<Message> {
    private static final Logger LOG = LogUtils.getL7dLogger(FaultOutInterceptor.class); 

    public FaultOutInterceptor() {
        super(Phase.PRE_PROTOCOL);
    }

    public void handleMessage(Message message) throws Fault {
        Fault f = (Fault)message.getContent(Exception.class);

        Throwable cause = f.getCause();
        if (cause == null) {
            return;
        }
        
        BindingOperationInfo bop = message.getExchange().get(BindingOperationInfo.class);
        if (bop == null) {
            return;
        }
        FaultInfo fi = getFaultForClass(bop, cause.getClass());

        if (cause instanceof Exception && fi != null) {
            Exception ex = (Exception)cause;
            Object bean = getFaultBean(cause, fi, message);
            Service service = message.getExchange().get(Service.class);

            MessagePartInfo part = fi.getMessageParts().iterator().next();
            DataBinding db = service.getDataBinding();

            try {
                if (isDOMSupported(db)) {
                    DataWriter<Node> writer = db.createWriter(Node.class);

                    if (f.hasDetails()) {
                        writer.write(bean, part, f.getDetail());
                    } else {
                        writer.write(bean, part, f.getOrCreateDetail());
                        if (!f.getDetail().hasChildNodes()) {
                            f.setDetail(null);
                        }
                    }
                } else {
                    if (f.hasDetails()) {
                        XMLStreamWriter xsw = new W3CDOMStreamWriter(f.getDetail());
                        DataWriter<XMLStreamWriter> writer = db.createWriter(XMLStreamWriter.class);
                        writer.write(bean, part, xsw);
                    } else {
                        XMLStreamWriter xsw = new W3CDOMStreamWriter(f.getOrCreateDetail());
                        DataWriter<XMLStreamWriter> writer = db.createWriter(XMLStreamWriter.class);
                        writer.write(bean, part, xsw);
                        if (!f.getDetail().hasChildNodes()) {
                            f.setDetail(null);
                        }
                    }
                }
    
                f.setMessage(ex.getMessage());
            } catch (Exception fex) {
                //ignore - if any exceptions occur here, we'll ignore them
                //and let the default fault handling of the binding convert 
                //the fault like it was an unchecked exception.
                LOG.log(Level.WARNING, "EXCEPTION_WHILE_WRITING_FAULT", fex);
            }
        }
    }

    private boolean isDOMSupported(DataBinding db) {
        boolean supportsDOM = false;
        for (Class c : db.getSupportedWriterFormats()) {
            if (c.equals(Node.class)) {
                supportsDOM = true;
            }
        }
        return supportsDOM;
    }

    protected Object getFaultBean(Throwable cause, FaultInfo faultPart, Message message) {
        if (FaultInfoException.class.isAssignableFrom(cause.getClass())) {
            try {
                Method method = cause.getClass().getMethod("getFaultInfo", new Class[0]);
                return method.invoke(cause, new Object[0]);
            } catch (InvocationTargetException e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("INVOKE_FAULT_INFO", LOG), e);
            } catch (NoSuchMethodException e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("NO_FAULT_INFO_METHOD", LOG), e);
            } catch (Exception e) {
                throw new Fault(new org.apache.cxf.common.i18n.Message("NO_ACCCESS_FAULT_INFO", LOG), e);
            }
        }
        return cause;
    }

    /**
     * Find the correct Fault part for a particular exception.
     * 
     * @param op
     * @param class1
     * @return
     */
    public FaultInfo getFaultForClass(BindingOperationInfo op, Class class1) {
        for (BindingFaultInfo bfi : op.getFaults()) {

            FaultInfo faultInfo = bfi.getFaultInfo();
            Class<?> c = (Class)faultInfo.getProperty(Class.class.getName());
            if (c.isAssignableFrom(class1)) {
                return faultInfo;
            }
        }

        return null;
    }
}