edu.uci.ics.crawler4j.util.Util.java Source code

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Here is the source code for edu.uci.ics.crawler4j.util.Util.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 edu.uci.ics.crawler4j.util;

import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author Yasser Ganjisaffar <lastname at gmail dot com>
 */
public class Util {

    public static byte[] long2ByteArray(long l) {
        byte[] array = new byte[8];
        int i, shift;
        for (i = 0, shift = 56; i < 8; i++, shift -= 8) {
            array[i] = (byte) (0xFF & (l >> shift));
        }
        return array;
    }

    public static byte[] int2ByteArray(int value) {
        byte[] b = new byte[4];
        for (int i = 0; i < 4; i++) {
            int offset = (3 - i) * 8;
            b[i] = (byte) ((value >>> offset) & 0xFF);
        }
        return b;
    }

    public static void putIntInByteArray(int value, byte[] buf, int offset) {
        for (int i = 0; i < 4; i++) {
            int valueOffset = (3 - i) * 8;
            buf[offset + i] = (byte) ((value >>> valueOffset) & 0xFF);
        }
    }

    public static int byteArray2Int(byte[] b) {
        int value = 0;
        for (int i = 0; i < 4; i++) {
            int shift = (4 - 1 - i) * 8;
            value += (b[i] & 0x000000FF) << shift;
        }
        return value;
    }

    public static long byteArray2Long(byte[] b) {
        int value = 0;
        for (int i = 0; i < 8; i++) {
            int shift = (8 - 1 - i) * 8;
            value += (b[i] & 0x000000FF) << shift;
        }
        return value;
    }

    public static boolean hasBinaryContent(String contentType) {
        if (contentType != null) {
            String typeStr = contentType.toLowerCase();
            if (typeStr.contains("image") || typeStr.contains("audio") || typeStr.contains("video")
                    || typeStr.contains("application")) {
                return true;
            }
        }
        return false;
    }

    public static boolean hasXMLContent(String contentType) {
        if (contentType != null) {
            String typeStr = contentType.toLowerCase();
            if (typeStr.contains("text/xml") || typeStr.contains("application/xml")) {
                return true;
            }
        }
        return false;
    }

    public static boolean hasPlainTextContent(String contentType) {
        if (contentType != null) {
            String typeStr = contentType.toLowerCase();
            if (typeStr.contains("text/plain")) {
                return true;
            }
        }
        return false;
    }

    /**
     * Reads the provided InputStream and returns it as a String.
     * In case no encoding is provided, UTF-8 will be used as the default.
     *
     * @param is
     * @param encoding
     * @return
     */
    public static String toString(InputStream is, String encoding) {
        if (encoding == null) {
            encoding = "UTF-8";
        }
        try {
            return IOUtils.toString(is, encoding);
        } catch (IOException e) {
        }
        return null;
    }
}