BaseFetchException.java

/**
 * 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 focusedCrawler.crawler.crawlercommons.fetcher;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;

@SuppressWarnings({ "serial" })
public abstract class BaseFetchException extends Exception {
    private String _url = "";
    private Exception _exception;

    protected BaseFetchException() {
        super();

        _exception = new Exception();
    }

    protected BaseFetchException(String url) {
        super();

        _exception = new Exception();
        _url = url;
    }

    protected BaseFetchException(String url, String msg) {
        super(msg);

        _exception = new Exception(msg);
        _url = url;
    }

    protected BaseFetchException(String url, Exception e) {
        super(e);

        _exception = new Exception(e);
        _url = url;
    }

    protected BaseFetchException(String url, String msg, Exception e) {
        super(msg, e);

        _exception = new Exception(msg, e);
        _url = url;
    }

    // Our specific methods
    public String getUrl() {
        return _url;
    }

    protected int compareToBase(BaseFetchException e) {
        return _url.compareTo(e._url);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        BaseFetchException other = (BaseFetchException) obj;
        if (_exception == null) {
            if (other._exception != null)
                return false;
        } else if (!_exception.equals(other._exception))
            return false;
        if (_url == null) {
            if (other._url != null)
                return false;
        } else if (!_url.equals(other._url))
            return false;
        return true;
    }

    @Override
    public Throwable getCause() {
        return _exception.getCause();
    }

    @Override
    public String getLocalizedMessage() {
        return _exception.getLocalizedMessage();
    }

    @Override
    public String getMessage() {
        return _exception.getMessage();
    }

    @Override
    public StackTraceElement[] getStackTrace() {
        return _exception.getStackTrace();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((_exception == null) ? 0 : _exception.hashCode());
        result = prime * result + ((_url == null) ? 0 : _url.hashCode());
        return result;
    }

    @Override
    public Throwable initCause(Throwable cause) {
        return _exception.initCause(cause);
    }

    @Override
    public void printStackTrace() {
        _exception.getMessage();
    }

    @Override
    public void printStackTrace(PrintStream s) {
        _exception.printStackTrace(s);
    }

    @Override
    public void printStackTrace(PrintWriter s) {
        _exception.printStackTrace(s);
    }

    @Override
    public void setStackTrace(StackTraceElement[] stackTrace) {
        _exception.setStackTrace(stackTrace);
    }

    @Override
    public String toString() {
        return _url + ": " + _exception.toString();
    }

    protected void readBaseFields(DataInput input) throws IOException {
        int serializedLen = input.readInt();
        byte[] serialized = new byte[serializedLen];
        input.readFully(serialized);
        ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(serialized));

        try {
            _exception = (Exception) ois.readObject();
        } catch (ClassNotFoundException e) {
            throw new IOException(e);
        }

        _url = input.readUTF();
    }

    protected void writeBaseFields(DataOutput output) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(_exception);
        byte[] serialized = bos.toByteArray();
        output.writeInt(serialized.length);
        output.write(bos.toByteArray());
        output.writeUTF(_url);
    }

}