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/*
* URLDataStore.java
*
* Copyright 2013 3 Round Stones Inc.
* Some rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.xmlcalabash.io;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
/**
* Uses {@link URLConnection} to implement the interface.
*
* @author James Leigh <[email protected]>
*
*/
public class URLDataStore implements DataStore {
private final DataStore fallback;
public URLDataStore(DataStore fallback) {
super();
this.fallback = fallback;
}
public URI writeEntry(String href, String base, String media,
DataWriter handler) throws MalformedURLException,
FileNotFoundException, IOException {
URI baseURI = URI.create(base);
URI uri = baseURI.resolve(href);
URLConnection conn = uri.toURL().openConnection();
conn.setRequestProperty("Content-Type", media);
conn.setDoOutput(true);
conn.setDoInput(false);
OutputStream stream = conn.getOutputStream();
try {
handler.store(stream);
} finally {
stream.close();
}
String location = conn.getHeaderField("Content-Location");
URI url = URI.create(conn.getURL().toExternalForm());
if (location == null) {
return url;
} else {
return url.resolve(location);
}
}
public void readEntry(String href, String base, String accept,
String overrideContentType, DataReader handler) throws MalformedURLException,
FileNotFoundException, IOException {
URI baseURI = URI.create(base);
URL url = baseURI.resolve(href).toURL();
URLConnection connection = url.openConnection();
connection.setRequestProperty("Accept", accept);
final InputStream stream = connection.getInputStream();
try {
String type = connection.getContentType();
if (overrideContentType != null) {
type = overrideContentType;
}
URI id = URI.create(connection.getURL().toExternalForm());
long len = 0;
// Call getContentLengthLong if it's available
try {
Method lenMethod = connection.getClass().getDeclaredMethod("getContentLengthLong");
lenMethod.invoke(connection);
} catch (Exception e) {
// Whatever...
len = connection.getContentLength();
}
handler.load(id, type, stream, len);
} finally {
stream.close();
}
}
public void infoEntry(String href, String base, String accept,
DataInfo handler) throws MalformedURLException,
FileNotFoundException, IOException {
URI baseURI = URI.create(base);
URL url = baseURI.resolve(href).toURL();
URLConnection connection = url.openConnection();
connection.setRequestProperty("Accept", accept);
final InputStream stream = connection.getInputStream();
try {
String type = connection.getContentType();
URI id = URI.create(connection.getURL().toExternalForm());
handler.list(id, type, connection.getLastModified());
} finally {
stream.close();
}
}
public void listEachEntry(String href, String base, String accept,
DataInfo handler) throws MalformedURLException,
FileNotFoundException, IOException {
fallback.listEachEntry(href, base, accept, handler);
}
public URI createList(String href, String base)
throws MalformedURLException, FileNotFoundException, IOException {
return fallback.createList(href, base);
}
public void deleteEntry(String href, String base)
throws MalformedURLException, FileNotFoundException, IOException {
fallback.deleteEntry(href, base);
}
}
