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Configuration.java
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Configuration.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.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.csv.reader;
/**
* Configuration options around reading CSV data, or similar.
*/
public interface Configuration
{
/**
* TODO: Our intention is to flip this to false (which means to comply with RFC4180) at some point
* because of how it better complies with common expectancy of behavior. It may be least disruptive
* to do this when changing major version of the product.
*/
boolean DEFAULT_LEGACY_STYLE_QUOTING = true;
/**
* Character to regard as quotes. Quoted values can contain newline characters and even delimiters.
*/
char quotationCharacter();
/**
* Data buffer size.
*/
int bufferSize();
/**
* Whether or not fields are allowed to have newline characters in them, i.e. span multiple lines.
*/
boolean multilineFields();
/**
* Whether or not strings should be trimmed for whitespaces.
*/
boolean trimStrings();
/**
* @return {@code true} for treating empty strings, i.e. {@code ""} as null, instead of an empty string.
*/
boolean emptyQuotedStringsAsNull();
/**
* Adds a default implementation returning {@link #DEFAULT_LEGACY_STYLE_QUOTING}, this to not requiring
* any change to other classes using this interface.
*
* @return whether or not the parsing will interpret <code>\"</code> (see {@link #quotationCharacter()})
* as an inner quote. Reason why this is configurable is that this interpretation conflicts with
* "standard" RFC for CSV parsing, see https://tools.ietf.org/html/rfc4180. This also makes it impossible
* to enter some combinations of characters, e.g. <code>"""abc\"""</code>, when expecting <code>"abc\"</code>.
*/
default boolean legacyStyleQuoting()
{
return DEFAULT_LEGACY_STYLE_QUOTING;
}
int KB = 1024, MB = KB * KB;
int DEFAULT_BUFFER_SIZE_4MB = 4 * MB;
class Default implements Configuration
{
@Override
public char quotationCharacter()
{
return '"';
}
@Override
public int bufferSize()
{
return DEFAULT_BUFFER_SIZE_4MB;
}
@Override
public boolean multilineFields()
{
return false;
}
@Override
public boolean emptyQuotedStringsAsNull()
{
return false;
}
@Override
public boolean trimStrings()
{
return false;
}
}
Configuration DEFAULT = new Default();
class Overridden implements Configuration
{
private final Configuration defaults;
public Overridden( Configuration defaults )
{
this.defaults = defaults;
}
@Override
public char quotationCharacter()
{
return defaults.quotationCharacter();
}
@Override
public int bufferSize()
{
return defaults.bufferSize();
}
@Override
public boolean multilineFields()
{
return defaults.multilineFields();
}
@Override
public boolean emptyQuotedStringsAsNull()
{
return defaults.emptyQuotedStringsAsNull();
}
@Override
public boolean trimStrings()
{
return defaults.trimStrings();
}
@Override
public boolean legacyStyleQuoting()
{
return defaults.legacyStyleQuoting();
}
}
}