/**
* Copyright 2014 Eediom Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.araqne.logdb.query.expr;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.araqne.logdb.QueryContext;
import org.araqne.logdb.Row;
public class Groups extends FunctionExpression {
private Expression target;
private Matcher matcher;
public Groups(QueryContext ctx, List<Expression> exprs) {
super("groups", exprs, 2);
this.target = exprs.get(0);
this.matcher = Pattern.compile(exprs.get(1).eval(null).toString()).matcher("");
}
@Override
public Object eval(Row row) {
Object o = target.eval(row);
if (o == null)
return null;
matcher.reset(o.toString());
ArrayList<String> groups = null;
while (matcher.find()) {
int count = matcher.groupCount();
if (groups == null)
groups = new ArrayList<String>(count);
for (int i = 1; i <= count; i++)
groups.add(matcher.group(i));
}
return groups;
}
public static void main(String[] args) {
String a =
"sda 0.01 0.96 0.23 8.32 4.09 70.47 8.72 0.00 0.41 0.23 0.20";
String p = "\\s+([0-9\\.]+)";
Groups g = new Groups(null, Arrays.<Expression> asList(new EvalField("line"), new StringConstant(p)));
Row r = new Row();
r.put("line", a);
@SuppressWarnings("unchecked")
ArrayList<String> result = (ArrayList<String>) g.eval(r);
if (result != null)
for (String s : result)
System.out.println(s);
else
System.out.println("not found");
}
}