org.stjs.testing.driver.StreamUtils.java Source code

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Here is the source code for org.stjs.testing.driver.StreamUtils.java

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/**
 *  Copyright 2011 Alexandru Craciun, Eyal Kaspi
 *
 *  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 org.stjs.testing.driver;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.Charset;

import com.google.common.io.ByteStreams;
import com.google.common.io.CharStreams;
import com.google.common.io.Closeables;
import com.sun.net.httpserver.HttpExchange;

/**
 * 
 * utils to copy different urls to an output stream
 * 
 * @author acraciun
 */
@SuppressWarnings("restriction")
public class StreamUtils {
    private StreamUtils() {// static methods only
    }

    public static boolean copy(ClassLoader classLoader, String url, Writer out)
            throws IOException, URISyntaxException {
        URI uri = new URI(url);

        if (uri.getPath() == null) {
            throw new IllegalArgumentException("Wrong path in uri:" + url);
        }

        InputStream is = classLoader.getResourceAsStream(uri.getPath().substring(1));
        if (is == null) {
            return false;
        }
        Reader reader = new InputStreamReader(is, Charset.forName("UTF-8"));
        try {
            CharStreams.copy(reader, out);
            out.flush();
        } finally {
            reader.close();
        }
        return true;
    }

    private static long getResourceSize(ClassLoader classLoader, String path) throws IOException {
        final InputStream is = classLoader.getResourceAsStream(path);
        try {
            // TODO improve this
            long n = 0;
            while (is.read() >= 0) {
                n++;
            }
            return n;
        } finally {
            Closeables.closeQuietly(is);
        }
    }

    public static boolean copy(ClassLoader classLoader, String url, HttpExchange exchange)
            throws IOException, URISyntaxException {
        URI uri = new URI(url);

        if (uri.getPath() == null) {
            throw new IllegalArgumentException("Wrong path in uri:" + url);
        }

        InputStream is = classLoader.getResourceAsStream(uri.getPath().substring(1));
        if (is == null) {
            exchange.sendResponseHeaders(HttpURLConnection.HTTP_NOT_FOUND, 0);
            return false;
        }
        try {
            exchange.sendResponseHeaders(HttpURLConnection.HTTP_OK,
                    getResourceSize(classLoader, uri.getPath().substring(1)));
            OutputStream out = exchange.getResponseBody();
            ByteStreams.copy(is, out);
            out.flush();
        } finally {
            is.close();
        }

        // TODO handle remote urls too
        return true;
    }
}