package my_mat_extension;

import org.eclipse.mat.query.IQuery;
import org.eclipse.mat.query.IResult;
import org.eclipse.mat.query.annotations.Argument;
import org.eclipse.mat.query.annotations.CommandName;
import org.eclipse.mat.query.results.TextResult;
import org.eclipse.mat.util.IProgressListener;

import java.io.CharArrayWriter;
import java.io.PrintWriter;

@CommandName("my_first_query")
public class MyFirstQuery implements IQuery {

  @Override
  public IResult execute(IProgressListener listener) throws Exception {
    CharArrayWriter outWriter = new CharArrayWriter(1000);
    PrintWriter out = new PrintWriter(outWriter);
    out.println("My first query.");
    return new TextResult(outWriter.toString(), false);
  }

}

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.4"?>
<plugin>
   <extension point="org.eclipse.mat.report.query">
      <query impl="my_mat_extension.MyFirstQuery" />
   </extension>
   
   <extension point="org.eclipse.mat.report.report">
      <report id="my_first_query" name="My First Query"
        description="My First Description"
        file="META-INF/reports/my_first_query.xml" />
   </extension>

</plugin>

<query name="My First Query" xmlns:xsi="h t t p : / / w w w .w3.org/2001/XMLSchema-instance"
  xmlns="h t t p : / / w w w .eclipse.org/mat/report.xsd"
  xsi:schemaLocation="h t t p : / / w w w .eclipse.org/mat/report.xsd ../../../org.eclipse.mat.report/schema/report.xsd">

  <param key="filename_suffix" value="My First Query" />
  <command>my_first_query</command>
</query>