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/*******************************************************************************
* Copyright (c) 2005, 2011 IBM Corporation and others. All rights reserved. This
* program and the accompanying materials are made available under the terms of
* the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors: IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.osgi.internal.module;
import org.eclipse.osgi.service.resolver.BundleDescription;
import org.eclipse.osgi.service.resolver.VersionConstraint;
import org.osgi.framework.wiring.BundleRequirement;
/*
* A companion to VersionConstraint from the state used while resolving
*/
public abstract class ResolverConstraint {
final protected ResolverBundle bundle;
protected VersionConstraint constraint;
private BundleRequirement requrement;
private VersionSupplier[] possibleSuppliers;
private int selectedSupplierIndex = 0;
ResolverConstraint(ResolverBundle bundle, VersionConstraint constraint) {
this.bundle = bundle;
this.constraint = constraint;
this.requrement = constraint.getRequirement();
}
// returns the Resolver bundle requiring the ResolverConstraint
ResolverBundle getBundle() {
return bundle;
}
// returns the BundleDescription requiring the ResolverConstraint
BundleDescription getBundleDescription() {
return bundle.getBundleDescription();
}
// returns whether this constraint is from an attached fragment
boolean isFromFragment() {
return constraint.getBundle().getHost() != null;
}
// Same as VersionConstraint but does additinal permission checks
boolean isSatisfiedBy(VersionSupplier vs) {
if (vs.getResolverBundle().isUninstalled() || !bundle.getResolver().getPermissionChecker().checkPermission(constraint, vs.getBaseDescription()))
return false;
return vs.getSubstitute() == null && constraint.isSatisfiedBy(vs.getBaseDescription());
}
// returns the companion VersionConstraint object from the State
VersionConstraint getVersionConstraint() {
return constraint;
}
// returns the name of this constraint
public String getName() {
return constraint.getName();
}
public String toString() {
return constraint.toString();
}
// returns whether this constraint is optional
abstract boolean isOptional();
void addPossibleSupplier(VersionSupplier supplier) {
if (supplier == null)
return;
// we hope multiple suppliers are rare so do simple array expansion here.
if (possibleSuppliers == null) {
possibleSuppliers = new VersionSupplier[] {supplier};
return;
}
VersionSupplier[] newSuppliers = new VersionSupplier[possibleSuppliers.length + 1];
System.arraycopy(possibleSuppliers, 0, newSuppliers, 0, possibleSuppliers.length);
newSuppliers[possibleSuppliers.length] = supplier;
possibleSuppliers = newSuppliers;
}
public void removePossibleSupplier(VersionSupplier supplier) {
if (possibleSuppliers == null || supplier == null)
return;
int index = -1;
for (int i = 0; i < possibleSuppliers.length; i++) {
if (possibleSuppliers[i] == supplier) {
index = i;
break;
}
}
if (index >= 0) {
if (possibleSuppliers.length == 1) {
possibleSuppliers = null;
return;
}
VersionSupplier[] newSuppliers = new VersionSupplier[possibleSuppliers.length - 1];
System.arraycopy(possibleSuppliers, 0, newSuppliers, 0, index);
if (index < possibleSuppliers.length - 1)
System.arraycopy(possibleSuppliers, index + 1, newSuppliers, index, possibleSuppliers.length - index - 1);
possibleSuppliers = newSuppliers;
}
}
int getNumPossibleSuppliers() {
if (possibleSuppliers == null)
return 0;
return possibleSuppliers.length;
}
boolean selectNextSupplier() {
if (possibleSuppliers == null || selectedSupplierIndex >= possibleSuppliers.length)
return false;
selectedSupplierIndex += 1;
return selectedSupplierIndex < possibleSuppliers.length;
}
VersionSupplier getSelectedSupplier() {
if (possibleSuppliers == null || selectedSupplierIndex >= possibleSuppliers.length)
return null;
return possibleSuppliers[selectedSupplierIndex];
}
void setSelectedSupplier(int selectedSupplier) {
this.selectedSupplierIndex = selectedSupplier;
}
int getSelectedSupplierIndex() {
return this.selectedSupplierIndex;
}
VersionSupplier[] getPossibleSuppliers() {
return possibleSuppliers;
}
void clearPossibleSuppliers() {
possibleSuppliers = null;
selectedSupplierIndex = 0;
}
void setVersionConstraint(VersionConstraint constraint) {
this.constraint = constraint;
this.requrement = constraint.getRequirement();
}
BundleRequirement getRequirement() {
return requrement;
}
}
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