/*
* Copyright (c) 2005-2011 Vincent Vandenschrick. All rights reserved.
*
* This file is part of the Jspresso framework.
*
* Jspresso is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Jspresso 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Jspresso. If not, see <http://www.gnu.org/licenses/>.
*/
package org.jspresso.framework.util.freemarker;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import freemarker.template.SimpleScalar;
import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
/**
* Infers a SQL column name from a property name.
*
* @version $LastChangedRevision: 4321 $
* @author Vincent Vandenschrick
* @author Pierre-m Raoul (atao)
*/
public class GenerateSqlName implements TemplateMethodModel {
private static final Formatter DEFAULT_FORMATTER;
private static final KeyWordProvider DEFAULT_KEY_WORD_PROVIDER;
private static final String WORD_SEP = "_";
static {
DEFAULT_FORMATTER = new Formatter() {
@Override
public String run(String name) {
StringBuffer result = new StringBuffer();
for (int i = 0; i < name.length(); i++) {
if (i > 0 && Character.isLowerCase(name.charAt(i - 1))
&& Character.isUpperCase(name.charAt(i))) {
result.append(WORD_SEP);
}
result.append(Character.toUpperCase(name.charAt(i)));
}
return result.toString();
}
};
DEFAULT_KEY_WORD_PROVIDER = new KeyWordProvider() {
@Override
public List<String> run() {
return Arrays.asList(new String[] {
"BEGIN", "END", "GROUP", "FUNCTION", "ACTION", "ARRAY", "DATE", "DATA",
"DAY", "MONTH", "YEAR", "FROM", "TO"
});
}
};
}
private Formatter formatter;
private Set<String> reservedKeyWords;
/**
* Constructs a new <code>GenerateSqlName</code> instance.
*/
public GenerateSqlName() {
reservedKeyWords = new HashSet<String>(DEFAULT_KEY_WORD_PROVIDER.run());
formatter = DEFAULT_FORMATTER;
}
/**
* Infer a SQL column name from a property name. By default: - use camel
* parser to separate words with "_" - check for sql reserved key words
* {@inheritDoc}
*/
@Override
public TemplateModel exec(@SuppressWarnings("rawtypes") List arguments)
throws TemplateModelException {
String sqlColumnName = formatter.run(arguments.get(0).toString());
if (isReserved(sqlColumnName)) {
sqlColumnName += WORD_SEP;
if (arguments.size() > 1 && arguments.get(1) != null) {
sqlColumnName += formatter.run(arguments.get(1).toString());
}
}
try {
return new SimpleScalar(sqlColumnName);
} catch (Exception ex) {
throw new TemplateModelException("Could not infer SQL column name.", ex);
}
}
/**
* Sets an additional keyword provider.
*
* @param provider
* an additional keyword provider.
*/
public void setAdditionalKeyWordProvider(KeyWordProvider provider) {
if (provider == null) {
return;
}
reservedKeyWords.addAll(provider.run());
}
/**
* Sets a new column name formatter. If null, the default one is restored.
*
* @param formatter
* a new formatter.
*/
public void setFormatter(Formatter formatter) {
if (formatter != null) {
this.formatter = formatter;
} else {
this.formatter = DEFAULT_FORMATTER;
}
}
/**
* Sets a new keyword provider. If null, the default one is restored.
*
* @param provider
* a new keyword provider.
*/
public void setKeyWordProvider(KeyWordProvider provider) {
KeyWordProvider currentProvider;
if (provider != null) {
currentProvider = provider;
} else {
currentProvider = DEFAULT_KEY_WORD_PROVIDER;
}
reservedKeyWords = new HashSet<String>(currentProvider.run());
}
private boolean isReserved(String name) {
return reservedKeyWords.contains(name.toUpperCase());
}
/**
* Any modification of the provided word before checking, e.g. from camel
* style to upper case and underscore separated.
*/
public interface Formatter {
/**
* Executes the formatter on the given name.
*
* @param name
* the name to format
* @return the formatted name.
*/
String run(String name);
}
/**
* Provide upper case reserved key words.
*/
public interface KeyWordProvider {
/**
* Gets the list of reserved keywords uppercase.
*
* @return the list of reserved keywords uppercase.
*/
List<String> run();
}
}