org.snmp4j.agent.DefaultMOQuery Maven / Gradle / Ivy
/*_############################################################################
_##
_## SNMP4J-Agent - DefaultMOQuery.java
_##
_## Copyright (C) 2005-2009 Frank Fock (SNMP4J.org)
_##
_## 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.snmp4j.agent;
// For JavaDoc
import org.snmp4j.agent.request.Request;
/**
* The DefaultMOQuery class is the default implementation of a
* managed object query. It is used to lookup managed objects, for example in
* a {@link MOServer} repository.
*
* @author Frank Fock
* @version 1.1
*/
public class DefaultMOQuery implements MOQuery {
private MOContextScope scope;
private boolean writeAccessQuery;
private Object source;
/**
* Creates a context aware query from a context aware OID scope.
* @param scope
* a scope that defines the possible result set of OIDs from a specific
* context for this query.
*/
public DefaultMOQuery(MOContextScope scope) {
this.scope = scope;
}
/**
* Creates a context aware query from a context aware OID scope.
* @param scope
* a scope that defines the possible result set of OIDs from a specific
* context for this query.
* @param isWriteAccessIntended
* indicates whether this query serves a write access on
* {@link ManagedObject}s or not.
* @since 1.1
*/
public DefaultMOQuery(MOContextScope scope, boolean isWriteAccessIntended) {
this(scope);
this.writeAccessQuery = isWriteAccessIntended;
}
/**
* Creates a context aware query from a context aware OID scope.
* @param scope
* a scope that defines the possible result set of OIDs from a specific
* context for this query.
* @param isWriteAccessIntended
* indicates whether this query serves a write access on
* {@link ManagedObject}s or not.
* @since 1.1
*/
public DefaultMOQuery(MOContextScope scope, boolean isWriteAccessIntended,
Object source) {
this(scope, isWriteAccessIntended);
this.source = source;
}
/**
* Gets the search range of this query.
*
* @return a MORange instance denoting upper and lower bound of
* this queries scope.
*/
public MOContextScope getScope() {
return scope;
}
/**
* Checks whether a managed object matches the internal query criteria
* defined by this query.
*
* @param managedObject the ManagedObject instance to check.
* @return true if the managedObject matches the
* query.
*/
public boolean matchesQuery(ManagedObject managedObject) {
return true;
}
public void substractScope(MOScope scope) {
if (this.scope instanceof MutableMOScope) {
((MutableMOScope)this.scope).substractScope(scope);
}
else {
throw new UnsupportedOperationException();
}
}
public String toString() {
return getClass().getName()+"["+getScope().getContext()+"]="+
getScope().getLowerBound()+"<"+
(getScope().isLowerIncluded() ? "=" : "")+" x <"+
(getScope().isUpperIncluded() ? "=" : "")+
getScope().getUpperBound();
}
public boolean isWriteAccessQuery() {
return writeAccessQuery;
}
/**
* Gets the source ({@link Request}) object on whose behalf this query is
* executed. This object reference can be used to determine whether a query
* needs to update {@link ManagedObject} content or not. When the reference
* is the same as those from the last query then an update is not necessary.
*
* @return
* an Object on whose behalf this query is executed which will be in most
* cases a {@link Request} instance, but code should not rely on that. If
* null is returned, the query source cannot be determined.
* @since 1.1
*/
public Object getSource() {
return source;
}
/**
* This method checks whether the supplied query and the given source
* reference refer to the same source (request).
*
* @param query
* a MOQuery instance.
* @param source
* any source object reference.
* @return
* true only if query is a
* DefaultMOQuery instance and
* {@link DefaultMOQuery#getSource()} == source and source
* is not null.
* @since 1.1
*/
public static boolean isSameSource(MOQuery query, Object source) {
if (query instanceof DefaultMOQuery) {
return ((source != null) &&
(((DefaultMOQuery)query).getSource() == source));
}
return false;
}
}