package nl.siegmann.epublib.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import net.sf.jazzlib.ZipEntry;
import net.sf.jazzlib.ZipInputStream;
import nl.siegmann.epublib.Constants;
import nl.siegmann.epublib.domain.MediaType;
import nl.siegmann.epublib.domain.Resource;
import nl.siegmann.epublib.epub.EpubProcessorSupport;
import nl.siegmann.epublib.service.MediatypeService;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Various resource utility methods
*
* @author paul
*
*/
public class ResourceUtil {
public static Resource createResource(File file) throws IOException {
if (file == null) {
return null;
}
MediaType mediaType = MediatypeService.determineMediaType(file.getName());
byte[] data = IOUtil.toByteArray(new FileInputStream(file));
Resource result = new Resource(data, mediaType);
return result;
}
/**
* Creates a resource with as contents a html page with the given title.
*
* @param title
* @param href
* @return a resource with as contents a html page with the given title.
*/
public static Resource createResource(String title, String href) {
String content = "<html><head><title>" + title + "</title></head><body><h1>" + title + "</h1></body></html>";
return new Resource(null, content.getBytes(), href, MediatypeService.XHTML, Constants.CHARACTER_ENCODING);
}
/**
* Creates a resource out of the given zipEntry and zipInputStream.
*
* @param zipEntry
* @param zipInputStream
* @return a resource created out of the given zipEntry and zipInputStream.
* @throws IOException
*/
public static Resource createResource(ZipEntry zipEntry, ZipInputStream zipInputStream) throws IOException {
return new Resource(zipInputStream, zipEntry.getName());
}
public static Resource createResource(ZipEntry zipEntry, InputStream zipInputStream) throws IOException {
return new Resource(zipInputStream, zipEntry.getName());
}
/**
* Converts a given string from given input character encoding to the requested output character encoding.
*
* @param inputEncoding
* @param outputEncoding
* @param input
* @return the string from given input character encoding converted to the requested output character encoding.
* @throws UnsupportedEncodingException
*/
public static byte[] recode(String inputEncoding, String outputEncoding, byte[] input) throws UnsupportedEncodingException {
return new String(input, inputEncoding).getBytes(outputEncoding);
}
/**
* Gets the contents of the Resource as an InputSource in a null-safe manner.
*
*/
public static InputSource getInputSource(Resource resource) throws IOException {
if (resource == null) {
return null;
}
Reader reader = resource.getReader();
if (reader == null) {
return null;
}
InputSource inputSource = new InputSource(reader);
return inputSource;
}
/**
* Reads parses the xml therein and returns the result as a Document
*/
public static Document getAsDocument(Resource resource) throws UnsupportedEncodingException, SAXException, IOException, ParserConfigurationException {
return getAsDocument(resource, EpubProcessorSupport.createDocumentBuilder());
}
/**
* Reads the given resources inputstream, parses the xml therein and returns the result as a Document
*
* @param resource
* @param documentBuilder
* @return the document created from the given resource
* @throws UnsupportedEncodingException
* @throws SAXException
* @throws IOException
* @throws ParserConfigurationException
*/
public static Document getAsDocument(Resource resource, DocumentBuilder documentBuilder) throws UnsupportedEncodingException, SAXException, IOException, ParserConfigurationException {
InputSource inputSource = getInputSource(resource);
if (inputSource == null) {
return null;
}
Document result = documentBuilder.parse(inputSource);
return result;
}
}