org.openmdx.base.text.conversion.SQLWildcards Maven / Gradle / Ivy
/*
* ====================================================================
* Project: openMDX, http://www.openmdx.org/
* Description: SQL Wildcards
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2006, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.base.text.conversion;
import java.util.ArrayList;
import java.util.Collection;
/**
* SQL Wildcards
*/
public class SQLWildcards {
/**
* Constructor
*
* @param escape the SQL escape character
*/
public SQLWildcards(
char escape
) {
this.escape = escape;
}
/**
* the SQL escape character
*/
private final char escape;
/**
* Convert JDO wildcard expressions to SQL wildcard expressions
*
* Conversion rules:
* - ‘.*’ → ‘%’
*
- ‘.’ → ‘_’
*
- ‘%’ → escape + ‘%’
*
- ‘_’ → escape + ‘_’
*
- ‘\.\*’ → ‘.*’
*
- ‘\.’ → ‘.’
*
*
* @param jdoExpression the JDO expression to be converted
*
* @return the corresponding SQL expression
*/
public String fromJDO(
String jdoExpression
){
StringBuilder sqlExpression = new StringBuilder();
for(
int i = 0, iLimit = jdoExpression.length();
i < iLimit;
i++
){
char c = jdoExpression.charAt(i);
switch(c){
case '.':
int j = i + 1;
if(j < iLimit && jdoExpression.charAt(j) == '*') {
i = j;
sqlExpression.append(
'%'
);
} else {
sqlExpression.append(
'_'
);
}
break;
case '%': case '_':
sqlExpression.append(
this.escape
).append(
c
);
break;
case '\\':
if(i++ < iLimit) sqlExpression.append(
jdoExpression.charAt(i)
);
break;
default:
sqlExpression.append(
c
);
}
}
return sqlExpression.toString();
}
/**
* Convert a collection of JDO wildcard expressions to a collection of SQL
* wildcard expressions
*
* Conversion rules:
* - ‘.*’ → ‘%’
*
- ‘.’ → ‘_’
*
- ‘%’ → escape + ‘%’
*
- ‘_’ → escape + ‘_’
*
- ‘\.\*’ → ‘.*’
*
- ‘\.’ → ‘.’
*
*
* @param jdoExpressions the JDO expression collection to be converted
*
* @return the corresponding SQL expression collectioon
*/
public Collection fromJDO(
Collection jdoExpressions
){
Collection sqlExpressions = new ArrayList(jdoExpressions.size());
for(String jdoExpression : jdoExpressions){
sqlExpressions.add(fromJDO(jdoExpression));
}
return sqlExpressions;
}
/**
* Convert an SQL wildcard expressions to a JDO wildcard expression
*
* Conversion rules:
* - ‘%’ → ‘.*’
*
- ‘_’ → ‘.’
*
- escape + ‘%’ → ‘%’
*
- escape + ‘_’ → ‘_’
*
- ‘*’ → ‘\*’
*
- ‘.’ → ‘\.’
*
*
* @param sqlExpression the JDO expression to be converted
*
* @return the corresponding SQL expression
*/
public String toJDO(
String sqlExpression
){
StringBuilder jdoExpression = new StringBuilder();
for(
int i = 0, iLimit = sqlExpression.length();
i < iLimit;
i++
){
char c = sqlExpression.charAt(i);
if(c == this.escape) {
if(i++ < iLimit) jdoExpression.append(
sqlExpression.charAt(i)
);
} else switch(c){
case '%':
jdoExpression.append(
".*"
);
break;
case '_':
jdoExpression.append(
'.'
);
break;
case '.': // case '*':
jdoExpression.append(
'\\'
).append(
c
);
break;
default:
jdoExpression.append(
c
);
}
}
return jdoExpression.toString();
}
/**
* Convert a collection of SQL wildcard expressions to a collection of JDO
* wildcard expressions
*
* Conversion rules:
* - ‘%’ → ‘.*’
*
- ‘_’ → ‘.’
*
- escape + ‘%’ → ‘%’
*
- escape + ‘_’ → ‘_’
*
- ‘*’ → ‘\*’
*
- ‘.’ → ‘\.’
*
*
* @param sqlExpressions the SQL expression collection to be converted
*
* @return the corresponding JDO expression collectioon
*/
public Collection toJDO(
Collection sqlExpressions
){
Collection jdoExpressions = new ArrayList(sqlExpressions.size());
for(String sqlExpression : sqlExpressions) {
jdoExpressions.add(fromJDO(sqlExpression));
}
return jdoExpressions;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy