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package org.hisp.dhis.system.util;
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import java.util.Collection;
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* Copyright (c) 2004-2007, University of Oslo
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the HISP project nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* @author Lars Helge Overland
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public class TextUtils
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* Gets the sub string of the given string. If the beginIndex is larger than
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* the length of the string, the empty string is returned. If the beginIndex +
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* the length is larger than the length of the string, the part of the string
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* following the beginIndex is returned.
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* @param string the string.
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* @param beginIndex the zero-based begin index.
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* @param length the length of the sub string starting at the begin index.
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* @return the sub string of the given string.
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public static String subString( String string, int beginIndex, int length )
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int endIndex = beginIndex + length;
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if ( beginIndex >= string.length() )
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if ( endIndex > string.length() )
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return string.substring( beginIndex, string.length() );
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return string.substring( beginIndex, endIndex );
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* Transforms a collection of Integers into a comma delimited String.
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* @param elements the collection of Integers
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* @return a comma delimited String.
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public static String getCommaDelimitedString( Collection<Integer> elements )
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if ( elements != null && elements.size() > 0 )
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StringBuffer buffer = new StringBuffer();
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for ( Integer element : elements )
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buffer.append( element.toString() ).append( ", " );
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return buffer.substring( 0, buffer.length() - ", ".length() );
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* Returns null if the given string is not null and contains no charachters,
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* the string itselft otherwise.
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* @param string the string.
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* @return null if the given string is not null and contains no charachters,
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* the string itself otherwise.
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public static String nullIfEmpty( String string )
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return string != null && string.trim().length() == 0 ? null : string;