org.jooby.internal.URLAsset.java Source code

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Here is the source code for org.jooby.internal.URLAsset.java

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/**
 * 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.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.jooby.Asset;
import org.jooby.MediaType;

import com.google.common.io.Closeables;

class URLAsset implements Asset {

    private URL url;

    private MediaType mediaType;

    private long lastModified;

    public URLAsset(final URL url, final MediaType mediaType) throws IOException {
        this.url = requireNonNull(url, "An url is required.");
        this.mediaType = requireNonNull(mediaType, "A mediaType is required.");
        this.lastModified = lastModified(url);
    }

    @Override
    public String name() {
        String path = url.getPath();
        int slash = path.lastIndexOf('/');
        return path.substring(slash + 1);
    }

    @Override
    public InputStream stream() throws IOException {
        return url.openStream();
    }

    @Override
    public long lastModified() {
        return lastModified;
    }

    @Override
    public MediaType type() {
        return mediaType;
    }

    @Override
    public String toString() {
        return name() + "(" + type() + ")";
    }

    private static long lastModified(final URL resource) throws IOException {
        URLConnection uc = null;
        try {
            uc = resource.openConnection();
            return uc.getLastModified();
        } catch (IOException ex) {
            return -1;
        } finally {
            if (uc != null) {
                // http://stackoverflow.com/questions/2057351/how-do-i-get-the-last-modification-time-of
                // -a-java-resource
                Closeables.close(uc.getInputStream(), true);
            }
        }
    }

}