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StringValue.java
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StringValue.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.values.storable;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.neo4j.hashing.HashFunction;
import org.neo4j.values.AnyValue;
import org.neo4j.values.ValueMapper;
import org.neo4j.values.virtual.ListValue;
import org.neo4j.values.virtual.VirtualValues;
import static java.lang.String.format;
public abstract class StringValue extends TextValue
{
abstract String value();
@Override
public boolean equals( Value value )
{
return value.equals( value() );
}
@Override
public boolean equals( char x )
{
return value().length() == 1 && value().charAt( 0 ) == x;
}
@Override
public boolean equals( String x )
{
return value().equals( x );
}
@Override
public <E extends Exception> void writeTo( ValueWriter<E> writer ) throws E
{
writer.writeString( value() );
}
@Override
public TextValue toLower()
{
return new StringWrappingStringValue( value().toLowerCase() );
}
@Override
public TextValue toUpper()
{
return new StringWrappingStringValue( value().toUpperCase() );
}
@Override
public ListValue split( String separator )
{
assert separator != null;
String asString = value();
//Cypher has different semantics for the case where the separator
//is exactly the value, in cypher we expect two empty arrays
//where as java returns an empty array
if ( separator.equals( asString ) )
{
return EMPTY_SPLIT;
}
else if ( separator.isEmpty() )
{
return VirtualValues.fromArray( Values.charArray( asString.toCharArray() ) );
}
List<AnyValue> split = splitNonRegex( asString, separator );
return VirtualValues.fromList( split );
}
/**
* Splits a string.
*
* @param input String to be split
* @param delim delimiter, must not be not empty
* @return the split string as a List of TextValues
*/
private static List<AnyValue> splitNonRegex( String input, String delim )
{
List<AnyValue> l = new ArrayList<>();
int offset = 0;
while ( true )
{
int index = input.indexOf( delim, offset );
if ( index == -1 )
{
String substring = input.substring( offset );
l.add( Values.stringValue( substring ) );
return l;
}
else
{
String substring = input.substring( offset, index );
l.add( Values.stringValue( substring ) );
offset = index + delim.length();
}
}
}
@Override
public TextValue replace( String find, String replace )
{
assert find != null;
assert replace != null;
return Values.stringValue( value().replace( find, replace ) );
}
@Override
public Object asObjectCopy()
{
return value();
}
@Override
public String toString()
{
return format( "%s(\"%s\")", getTypeName(), value() );
}
@Override
public String getTypeName()
{
return "String";
}
@Override
public String stringValue()
{
return value();
}
@Override
public String prettyPrint()
{
return format( "'%s'", value() );
}
@Override
public <T> T map( ValueMapper<T> mapper )
{
return mapper.mapString( this );
}
//NOTE: this doesn't respect code point order for code points that doesn't fit 16bits
@Override
public int compareTo( TextValue other )
{
String thisString = value();
String thatString = other.stringValue();
return thisString.compareTo( thatString );
}
static TextValue EMPTY = new StringValue()
{
@Override
protected int computeHash()
{
return 0;
}
@Override
public long updateHash( HashFunction hashFunction, long hash )
{
return hashFunction.update( hash, 0 ); // Mix in our length; a single zero.
}
@Override
public int length()
{
return 0;
}
@Override
public TextValue substring( int start, int end )
{
return this;
}
@Override
public TextValue trim()
{
return this;
}
@Override
public TextValue ltrim()
{
return this;
}
@Override
public TextValue rtrim()
{
return this;
}
@Override
public TextValue reverse()
{
return this;
}
@Override
public TextValue plus( TextValue other )
{
return other;
}
@Override
public TextValue toLower()
{
return this;
}
@Override
public TextValue toUpper()
{
return this;
}
@Override
public TextValue replace( String find, String replace )
{
if ( find.isEmpty() )
{
return Values.stringValue( replace );
}
else
{
return this;
}
}
@Override
public int compareTo( TextValue other )
{
return -other.length();
}
@Override
Matcher matcher( Pattern pattern )
{
return pattern.matcher( "" );
}
@Override
String value()
{
return "";
}
};
}