io.smartspaces.util.web.UrlConnectionUrlReader.java Source code

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Here is the source code for io.smartspaces.util.web.UrlConnectionUrlReader.java

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/*
 * Copyright (C) 2016 Keith M. Hughes
 * Copyright (C) 2015 Google Inc.
 *
 * 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 io.smartspaces.util.web;

import io.smartspaces.SmartSpacesException;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

import com.google.common.io.Closeables;

/**
 * A {@link UrlReader} that uses the Java UrlConnection class.
 *
 * @author Keith M. Hughes
 */
public class UrlConnectionUrlReader implements UrlReader {

    /**
     * Default value for the connection timeout.
     */
    public static final int CONNECT_TIMEOUT_DEFAULT = 5000;

    /**
     * Timeout for the connection in msecs.
     */
    private int connectTimeout = CONNECT_TIMEOUT_DEFAULT;;

    @Override
    public <T> T read(String url, UrlReaderProcessor<T> processor) {
        BufferedReader reader = null;
        try {
            URL u = new URL(url);

            URLConnection connection = u.openConnection();
            connection.setConnectTimeout(connectTimeout);

            reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));

            return processor.process(reader);
        } catch (Throwable e) {
            throw new SmartSpacesException(String.format("Could not process URL contents for %s", url), e);
        } finally {
            Closeables.closeQuietly(reader);
        }
    }

    @Override
    public int getConnectTimeout() {
        return connectTimeout;
    }

    @Override
    public void setConnectTimeout(int connectTimeout) {
        this.connectTimeout = connectTimeout;
    }
}