Package org.eclipse.mat.snapshot

Class OQL

java.lang.Object
org.eclipse.mat.snapshot.OQL
public final class OQL extends Object
Factory for often-used OQL queries.

  • Method Details

    • forAddress

      public static final String forAddress(long address)
      Select object by its address.

    • forObjectId

      public static final String forObjectId(int objectId)
      Select object by its object id.

    • forObjectIds

      public static String forObjectIds(int[] objectIds)
      Select objects by its ids.

    • retainedBy

      public static final String retainedBy(String oqlQuery)
      Select the retained set of a given OQL query.

    • retainedBy

      public static String retainedBy(int objectId)
      Select the retained set of a given object.

    • forObjectsOfClass

      public static final String forObjectsOfClass(IClass clasz)
      All objects of a given class.

    • forObjectsOfClass

      public static final String forObjectsOfClass(int classId)
      All objects of a class identified by its id.

    • union

      public static void union(StringBuilder query, String other)
      Create a OQL union statement and append it to the query. Possibly optimize a common prefix. select s.a,s.b,s.c from 1,173 s select s.a,s.b,s.c from 123 s combine to select s.a,s.b,s.c from 1,173,123 s Also split off UNION clauses to see if the new clause can be merged into an existing UNION clause.

    • instancesByPattern

      public static String instancesByPattern(Pattern pattern, boolean includeSubclasses)
      Return all instances of classes matching a given regular expression.

    • classesByPattern

      public static String classesByPattern(Pattern pattern, boolean includeSubclasses)
      Returns all classes matching a given regular expression.

    • instancesByClassLoaderId

      public static String instancesByClassLoaderId(int classLoaderId)
      Returns an OQL query string to select all objects loaded by the given class loader. 
             select *
       from
       (
            select *
            from java.lang.Class c
            where
                c implements org.eclipse.mat.snapshot.model.IClass
                and c.@classLoaderId = {0}
       )
      Parameters:
      classLoaderId - the object id of the class loader
      Returns:
      an OQL query selecting all objects loaded by the class loader

    • classesByClassLoaderId

      public static String classesByClassLoaderId(int classLoaderId)
      Returns an OQL query string to select all classes loaded by the given class loader. 
             select *
       from java.lang.Class c
       where
            c implements org.eclipse.mat.snapshot.model.IClass
            and c.@classLoaderId = {0}
      Parameters:
      classLoaderId - the object id of the class loader
      Returns:
      an OQL query selecting all classes loaded by the class loader