/**
* 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.jooby.internal;
import static java.util.Objects.requireNonNull;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.function.BiConsumer;
import org.jooby.Asset;
import org.jooby.MediaType;
import com.google.common.io.Closeables;
public class URLAsset implements Asset {
interface Supplier {
InputStream get() throws IOException;
}
private URL url;
private MediaType mediaType;
private long lastModified = -1;
private long length = -1;
private Supplier stream;
private String path;
private boolean exists;
public URLAsset(final URL url, final String path, final MediaType mediaType) throws Exception {
this.url = requireNonNull(url, "An url is required.");
this.path = requireNonNull(path, "Path is required.");
this.mediaType = requireNonNull(mediaType, "A mediaType is required.");
this.stream = attr(url, (len, lstMod) -> {
this.length = len(len);
this.lastModified = lmod(lstMod);
});
this.exists = this.stream != null;
}
@Override
public String path() {
return path;
}
@Override
public URL resource() {
return url;
}
@Override
public long length() {
return length;
}
@Override
public InputStream stream() throws Exception {
return stream.get();
}
@Override
public long lastModified() {
return lastModified;
}
@Override
public MediaType type() {
return mediaType;
}
@Override
public String toString() {
return path() + "(" + type() + ")";
}
private static Supplier attr(final URL resource, final BiConsumer<Long, Long> attrs)
throws Exception {
if ("file".equals(resource.getProtocol())) {
File file = new File(resource.toURI());
if (file.exists() && file.isFile()) {
attrs.accept(file.length(), file.lastModified());
return () -> new FileInputStream(file);
}
return null;
} else {
URLConnection cnn = resource.openConnection();
cnn.setUseCaches(false);
attrs.accept(cnn.getContentLengthLong(), cnn.getLastModified());
try {
Closeables.closeQuietly(cnn.getInputStream());
} catch (NullPointerException ex) {
// dir entries throw NPE :S
return null;
}
return () -> resource.openStream();
}
}
private static long len(final long value) {
return value < 0 ? -1 : value;
}
private static long lmod(final long value) {
return value > 0 ? value : -1;
}
public boolean exists() {
return exists;
}
}