org.snmp4j.agent.DefaultMOScope Maven / Gradle / Ivy
/*_############################################################################
_##
_## SNMP4J-Agent 3 - DefaultMOScope.java
_##
_## Copyright (C) 2005-2021 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;
import org.snmp4j.smi.*;
/**
* The {@code DefaultMOScope} is the default {@link MOScope} and
* {@link MutableMOScope} implementation.
*
* @author Frank Fock
* @version 3.5.2
*/
public class DefaultMOScope implements MOScope, MutableMOScope {
protected OID lowerBound;
protected OID upperBound;
protected boolean lowerIncluded;
protected boolean upperIncluded;
/**
* Creates an OID scope from lower and upper bound.
* @param lowerBound
* the lower bound of the scope.
* @param lowerIncluded
* indicates whether the lower bound is included in the scope or not.
* @param upperBound
* the upper bound of the scope, {@code null} can be specified to
* set no upper limit.
* @param upperIncluded
* indicates whether the upper bound is included in the scope or not.
*/
public DefaultMOScope(OID lowerBound, boolean lowerIncluded,
OID upperBound, boolean upperIncluded) {
this.lowerBound = lowerBound;
this.upperBound = upperBound;
this.lowerIncluded = lowerIncluded;
this.upperIncluded = upperIncluded;
}
/**
* Creates a scope from another scope by referencing its bound values.
* @param other
* another scope.
*/
public DefaultMOScope(MOScope other) {
this.lowerBound = other.getLowerBound();
this.upperBound = other.getUpperBound();
this.lowerIncluded = other.isLowerIncluded();
this.upperIncluded = other.isUpperIncluded();
}
@Override
public OID getLowerBound() {
return lowerBound;
}
@Override
public OID getUpperBound() {
return upperBound;
}
@Override
public boolean isLowerIncluded() {
return lowerIncluded;
}
@Override
public boolean isUpperIncluded() {
return upperIncluded;
}
@Override
public boolean isCovered(MOScope other) {
return covers(this, other);
}
@Override
public boolean isOverlapping(MOScope other) {
return overlaps(this, other);
}
@Override
public void setLowerBound(OID lowerBound) {
this.lowerBound = lowerBound;
}
@Override
public void setLowerIncluded(boolean lowerIncluded) {
this.lowerIncluded = lowerIncluded;
}
@Override
public void setUpperBound(OID upperBound) {
this.upperBound = upperBound;
}
@Override
public void setUpperIncluded(boolean upperIncluded) {
this.upperIncluded = upperIncluded;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof MOScope) {
MOScope other = (MOScope)obj;
return (lowerBound.equals(other.getLowerBound()) &&
(((upperBound == null) && (other.getUpperBound() == null)) ||
(upperBound.equals(other.getUpperBound()))) &&
(lowerIncluded == other.isLowerIncluded()) &&
(upperIncluded == other.isUpperIncluded()));
}
return false;
}
@Override
public int hashCode() {
return lowerBound.hashCode();
}
/**
* Indicates whether this scope covers by the supplied one, that is whether
* the lower bound of this scope is less or equal to the lower bound of the
* covered scope and if the upper bound is greater or equal to the upper
* bound of the covered scope.
*
* @param covered
* a MOScope instance.
* @return
* {@code true} if this OID scope covers the supplied one.
*/
public boolean covers(MOScope covered) {
return covers(this, covered);
}
/**
* Indicates whether the first supplied scope covers by second one.
* @param scope
* the covering scope.
* @param covered
* the covered scope.
* @return
* {@code true} if the lower bound of {@code scope} is less or
* equal to the lower bound of {@code covered} and if the upper bound
* is greater or equal to the upper bound of {@code covered}.
*/
public static boolean covers(MOScope scope, MOScope covered) {
int lowerResult = scope.getLowerBound().compareTo(covered.getLowerBound());
if ((lowerResult < 0) ||
((lowerResult == 0) && (scope.isLowerIncluded()))) {
if (scope.getUpperBound() == null) {
return true;
}
int upperResult =
scope.getUpperBound().compareTo(covered.getLowerBound());
if ((upperResult > 0) ||
((upperResult == 0) && (scope.isUpperIncluded()) &&
(covered.isLowerIncluded()))) {
return true;
}
}
return false;
}
/**
* Indicates whether the first scope supplied overlaps with the second one.
* If both scopes are instances of MOContextScope their context must match
*
* @param scope
* a MOScope instance.
* @param intersected
* the presumable intersected MOScope.
* @return
* {@code true} if {@code scope} overlaps any bound of
* {@code intersected}. This is always the case, if the upper bound
* of both scopes is {@code null}.
*/
public static boolean overlaps(MOScope scope, MOScope intersected) {
OID iUpper = intersected.getUpperBound();
if (iUpper == null) {
if (scope.getUpperBound() == null) {
return true;
}
int upperResult =
scope.getUpperBound().compareTo(intersected.getLowerBound());
return ((upperResult > 0) ||
((upperResult == 0) &&
(scope.isUpperIncluded() && intersected.isLowerIncluded())));
}
int lowerResult = scope.getLowerBound().compareTo(iUpper);
int upperResult = 1;
if (scope.getUpperBound() != null) {
upperResult = scope.getUpperBound().compareTo(intersected.getLowerBound());
}
if ((lowerResult == 0) &&
(scope.isLowerIncluded()) && (intersected.isUpperIncluded())) {
return true;
}
if ((upperResult == 0) &&
(scope.isUpperIncluded()) && (intersected.isLowerIncluded())) {
return true;
}
return (lowerResult < 0) && (upperResult > 0);
}
@Override
public void subtractScope(MOScope scope) {
if (lowerBound.compareTo(scope.getUpperBound()) <= 0) {
lowerBound = scope.getUpperBound();
lowerIncluded = !scope.isUpperIncluded();
}
}
@Override
public boolean covers(OID oid) {
if (oid == null) {
return false;
}
return (((getLowerBound().compareTo(oid) < 0) ||
(isLowerIncluded() && getLowerBound().equals(oid))) &&
((getUpperBound() == null) ||
(getUpperBound().compareTo(oid) > 0) ||
(isUpperIncluded() && getUpperBound().equals(oid))));
}
/**
* Checks if this scope is empty or not. An empty scope cannot cover any
* OID (i.e. lower bound is greater than upper bound).
* @return
* {@code true} if lower bound is greater than upper bound or if
* both bounds equal but one of the bounds is not-included.
*/
public boolean isEmpty() {
return (((lowerBound != null) && (upperBound != null)) &&
((lowerBound.compareTo(upperBound) > 0) ||
(lowerBound.equals(upperBound) &&
!(isLowerIncluded() && isUpperIncluded()))));
}
@Override
public String toString() {
return getClass().getName()+
"[lowerBound="+lowerBound+",lowerIncluded="+
lowerIncluded+",upperBound="+upperBound+
",upperIncluded="+upperIncluded+"]";
}
}
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