com.easemob.dataexport.utils.StringUtils.java Source code

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Here is the source code for com.easemob.dataexport.utils.StringUtils.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 com.easemob.dataexport.utils;

import java.nio.ByteBuffer;
import java.util.Arrays;

import static com.easemob.dataexport.utils.ConversionUtils.bytebuffer;
import static com.easemob.dataexport.utils.ConversionUtils.string;

public class StringUtils extends org.apache.commons.lang.StringUtils {

    //  private static final Logger LOG = LoggerFactory.getLogger( StringUtils.class );

    public static ByteBuffer hexToByteBuffer(String hexString) {
        byte[] bytes = hexToBytes(hexString);
        ByteBuffer byteBuffer = bytebuffer(bytes);
        return byteBuffer;
    }

    public static byte[] hexToBytes(String hexString) {
        char[] hex = hexString.toCharArray();
        int length = hex.length / 2;
        byte[] rawData = new byte[length];
        for (int i = 0; i < length; i++) {
            int high = Character.digit(hex[i * 2], 16);
            int low = Character.digit(hex[i * 2 + 1], 16);
            int value = (high << 4) | low;
            if (value > 127) {
                value -= 256;
            }
            rawData[i] = (byte) value;
        }
        return rawData;
    }

    public static Object lower(Object obj) {
        if (!(obj instanceof String)) {
            return obj;
        }
        return ((String) obj).toLowerCase();
    }

    public static String stringOrSubstringAfterLast(String str, char c) {
        if (str == null) {
            return null;
        }
        int i = str.lastIndexOf(c);
        if (i != -1) {
            return str.substring(i + 1);
        }
        return str;
    }

    public static String stringOrSubstringBeforeLast(String str, char c) {
        if (str == null) {
            return null;
        }
        int i = str.lastIndexOf(c);
        if (i != -1) {
            return str.substring(0, i);
        }
        return str;
    }

    public static String stringOrSubstringBeforeFirst(String str, char c) {
        if (str == null) {
            return null;
        }
        int i = str.indexOf(c);
        if (i != -1) {
            return str.substring(0, i);
        }
        return str;
    }

    public static String stringOrSubstringAfterFirst(String str, char c) {
        if (str == null) {
            return null;
        }
        int i = str.indexOf(c);
        if (i != -1) {
            return str.substring(i + 1);
        }
        return str;
    }

    public static String compactWhitespace(String str) {
        if (str == null) {
            return null;
        }
        boolean prevWS = false;
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            char c = str.charAt(i);
            if (Character.isWhitespace(c)) {
                if (!prevWS) {
                    builder.append(' ');
                }
                prevWS = true;
            } else {
                prevWS = false;
                builder.append(c);
            }
        }
        return builder.toString().trim();
    }

    /** @return new string with replace applied */
    public static String replaceAll(String source, String find, String replace) {
        if (source == null) {
            return null;
        }
        while (true) {
            String old = source;
            source = source.replaceAll(find, replace);
            if (source.equals(old)) {
                return source;
            }
        }
    }

    public static String toString(Object obj) {
        return string(obj);
    }

    public static String toStringFormat(Object obj, String format) {
        if (obj != null) {
            if (format != null) {
                if (obj.getClass().isArray()) {
                    return String.format(format, Arrays.toString((Object[]) obj));
                }
                return String.format(format, string(obj));
            } else {
                return string(obj);
            }
        }
        return "";
    }

    public static boolean isString(Object obj) {
        return obj instanceof String;
    }

    public static boolean isStringOrNull(Object obj) {
        if (obj == null) {
            return true;
        }
        return obj instanceof String;
    }

    //    public static String readClasspathFileAsString( String filePath ) {
    //        try {
    //            return IOUtils.toString( StringUtils.class.getResourceAsStream( filePath ) );
    //        }
    //        catch ( Exception e ) {
    //            LOG.error( "Error getting file from classpath: " + filePath, e );
    //        }
    //        return null;
    //    }
}