stack/core/src/main/java/org/apache/usergrid/utils/StringUtils.java

/*
 * 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.apache.usergrid.utils;


import java.text.DecimalFormat;
import java.util.Arrays;

import org.apache.commons.io.IOUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.apache.usergrid.utils.ConversionUtils.string;


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

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


    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 Boolean isNullOrEmpty(String s) {
        return (s == null || s.equals(""));
    }


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

    public static String readableByteSize(long size) {
        if(size <= 0) return "0";
        final String[] units = new String[] { "B", "kB", "MB", "GB", "TB" };
        int digitGroups = (int) (Math.log10(size)/Math.log10(1024));
        return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups];
    }
}