jails.http.converter.feed.AbstractWireFeedHttpMessageConverter.java Source code

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Here is the source code for jails.http.converter.feed.AbstractWireFeedHttpMessageConverter.java

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/*
 * Copyright 2002-2010 the original author or authors.
 *
 * 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 jails.http.converter.feed;

import jails.http.HttpInputMessage;
import jails.http.HttpOutputMessage;
import jails.http.MediaType;
import jails.http.converter.AbstractHttpMessageConverter;
import jails.http.converter.HttpMessageNotReadableException;
import jails.http.converter.HttpMessageNotWritableException;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;

import com.sun.syndication.feed.WireFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.WireFeedInput;
import com.sun.syndication.io.WireFeedOutput;

import org.springframework.util.StringUtils;

/**
 * Abstract base class for Atom and RSS Feed message converters, using java.net's
 * <a href="https://rome.dev.java.net/">ROME</a> package.
 *
 * @author Arjen Poutsma
 * @since 3.0.2
 * @see AtomFeedHttpMessageConverter
 * @see RssChannelHttpMessageConverter
 */
public abstract class AbstractWireFeedHttpMessageConverter<T extends WireFeed>
        extends AbstractHttpMessageConverter<T> {

    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    protected AbstractWireFeedHttpMessageConverter(MediaType supportedMediaType) {
        super(supportedMediaType);
    }

    @Override
    @SuppressWarnings("unchecked")
    protected T readInternal(Class<? extends T> clazz, HttpInputMessage inputMessage)
            throws IOException, HttpMessageNotReadableException {
        WireFeedInput feedInput = new WireFeedInput();
        MediaType contentType = inputMessage.getHeaders().getContentType();
        Charset charset;
        if (contentType != null && contentType.getCharSet() != null) {
            charset = contentType.getCharSet();
        } else {
            charset = DEFAULT_CHARSET;
        }
        try {
            Reader reader = new InputStreamReader(inputMessage.getBody(), charset);
            return (T) feedInput.build(reader);
        } catch (FeedException ex) {
            throw new HttpMessageNotReadableException("Could not read WireFeed: " + ex.getMessage(), ex);
        }
    }

    @Override
    protected void writeInternal(T wireFeed, HttpOutputMessage outputMessage)
            throws IOException, HttpMessageNotWritableException {
        String wireFeedEncoding = wireFeed.getEncoding();
        if (!StringUtils.hasLength(wireFeedEncoding)) {
            wireFeedEncoding = DEFAULT_CHARSET.name();
        }
        MediaType contentType = outputMessage.getHeaders().getContentType();
        if (contentType != null) {
            Charset wireFeedCharset = Charset.forName(wireFeedEncoding);
            contentType = new MediaType(contentType.getType(), contentType.getSubtype(), wireFeedCharset);
            outputMessage.getHeaders().setContentType(contentType);
        }

        WireFeedOutput feedOutput = new WireFeedOutput();

        try {
            Writer writer = new OutputStreamWriter(outputMessage.getBody(), wireFeedEncoding);
            feedOutput.output(wireFeed, writer);
        } catch (FeedException ex) {
            throw new HttpMessageNotWritableException("Could not write WiredFeed: " + ex.getMessage(), ex);
        }
    }
}