/**
* AnalyzerBeans
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.eobjects.analyzer.result;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eobjects.analyzer.beans.api.ParameterizableMetric;
import org.eobjects.analyzer.util.convert.StringConverter;
/**
* An abstract parser of metric parameters which supports IN [...] and NOT IN
* [...] expressions.
*
* @see Metric#supportsInClause()
*/
public abstract class QueryParameterizableMetric implements ParameterizableMetric {
private final Pattern _pattern;
public QueryParameterizableMetric() {
_pattern = Pattern.compile("(NOT )?IN (\\[.+\\])", Pattern.CASE_INSENSITIVE);
}
@Override
public final Number getValue(final String parameter) {
final String trimmedParameter = parameter.trim();
final Matcher matcher = _pattern.matcher(trimmedParameter);
if (matcher.matches()) {
String group = matcher.group(2);
StringConverter conv = new StringConverter(null);
String[] values = conv.deserialize(group, String[].class);
int sum = 0;
for (String value : values) {
sum += getInstanceCount(value);
}
if (trimmedParameter.toUpperCase().startsWith("NOT IN")) {
return getTotalCount() - sum;
} else {
return sum;
}
}
Integer count = getInstanceCount(parameter);
if (count == null) {
return 0;
}
return count;
}
/**
* Returns the abstract "total count" of which all "NOT IN" elements will be
* subtracted.
*
* @return
*/
protected abstract int getTotalCount();
/**
* Returns the metric count of a single value, either because it was queried
* stand-alone or because it was a part of an IN [...] or NOT IN [...]
* expression.
*
* @param instance
* @return
*/
protected abstract int getInstanceCount(String instance);
}