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/*******************************************************************************
* Copyright (c) 2004, 2005 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.service.resolver;
/**
* A helper class that provides convenience methods for manipulating
* state objects. <code>PlatformAdmin</code> provides an access point
* for a state helper.
* <p>
* Clients should not implement this interface.
* </p>
* @since 3.1
* @see PlatformAdmin#getStateHelper
*/
public interface StateHelper {
/**
* Indicates that access is encouraged to an <code>ExportPackageDescription</code>.
*/
public static int ACCESS_ENCOURAGED = 0x01;
/**
* Indicates that access is discouraged to an <code>ExportPackageDescription</code>.
*/
public static int ACCESS_DISCOURAGED = 0x02;
/**
* Returns all bundles in the state depending on the given bundles. The given bundles
* appear in the returned array.
*
* @param bundles the initial set of bundles
* @return an array containing bundle descriptions for the given roots and all
* bundles in the state that depend on them
*/
public BundleDescription[] getDependentBundles(BundleDescription[] bundles);
/**
* Returns all the prerequisite bundles in the state for the given bundles. The given
* bundles appear in the returned array.
* @param bundles the inital set of bundles
* @return an array containing bundle descriptions for the given leaves and their
* prerequisite bundles in the state.
* @since 3.2
*/
public BundleDescription[] getPrerequisites(BundleDescription[] bundles);
/**
* Returns all unsatisfied constraints in the given bundle. Returns an
* empty array if no unsatisfied constraints can be found.
* <p>
* Note that a bundle may have no unsatisfied constraints and still not be
* resolved.
* </p>
*
* @param bundle the bundle to examine
* @return an array containing all unsatisfied constraints for the given bundle
*/
public VersionConstraint[] getUnsatisfiedConstraints(BundleDescription bundle);
/**
* Returns all unsatisfied constraints in the given bundles that have no possible supplier.
* Returns an empty array if no unsatisfied leaf constraints can be found.
* <p>
* The returned constraints include only the unsatisfied constraints in the given
* state that have no possible supplier (leaf constraints). There may
* be additional unsatisfied constraints in the given bundles but these will have at
* least one possible supplier. In this case the possible supplier of the constraint
* is not resolved for some reason. For example, a given state only has Bundles X and Y
* installed and Bundles X and Y have the following constraints:
* </p>
* <pre>
* Bundle X requires Bundle Y
* Bundle Y requires Bundle Z</pre>
* <p>
* In this case Bundle Y has an unsatisfied constraint leaf on Bundle Z. This will
* cause Bundle X's constraint on Bundle Y to be unsatisfied as well because the
* bundles are involved in a dependency chain. Bundle X's constraint on Bundle Y is
* not considered a leaf because there is a possible supplier Y in the given state.
* </p>
* <p>
* Note that a bundle may have no unsatisfied constraints and still not be
* resolved.
* </p>
*
* @param bundles the bundles to examine
* @return an array containing all unsatisfied leaf constraints for the given bundles
* @since 3.2
*/
public VersionConstraint[] getUnsatisfiedLeaves(BundleDescription[] bundles);
/**
* Returns whether the given package specification constraint is resolvable.
* A package specification constraint may be
* resolvable but not resolved, which means that the bundle that provides
* it has not been resolved for some other reason (e.g. another constraint
* could not be resolved, another version has been picked, etc).
*
* @param specification the package specification constraint to be examined
* @return <code>true</code> if the constraint can be resolved,
* <code>false</code> otherwise
*/
public boolean isResolvable(ImportPackageSpecification specification);
/**
* Returns whether the given bundle specification constraint is resolvable.
* A bundle specification constraint may be
* resolvable but not resolved, which means that the bundle that provides
* it has not been resolved for some other reason (e.g. another constraint
* could not be resolved, another version has been picked, etc).
*
* @param specification the bundle specification constraint to be examined
* @return <code>true</code> if the constraint can be resolved,
* <code>false</code> otherwise
*/
public boolean isResolvable(BundleSpecification specification);
/**
* Returns whether the given host specification constraint is resolvable.
* A host specification constraint may be
* resolvable but not resolved, which means that the bundle that provides
* it has not been resolved for some other reason (e.g. another constraint
* could not be resolved, another version has been picked, etc).
*
* @param specification the host specification constraint to be examined
* @return <code>true</code> if the constraint can be resolved,
* <code>false</code> otherwise
*/
public boolean isResolvable(HostSpecification specification);
/**
* Sorts the given array of <strong>resolved</strong> bundles in pre-requisite order. If A
* requires B, A appears after B.
* Fragments will appear after all of their hosts. Constraints contributed by fragments will
* be treated as if contributed by theirs hosts, affecting their position. This is true even if
* the fragment does not appear in the given bundle array.
* <p>
* Unresolved bundles are ignored.
* </p>
*
* @param toSort an array of bundles to be sorted
* @return any cycles found
*/
public Object[][] sortBundles(BundleDescription[] toSort);
/**
* Returns a list of all packages that the specified bundle has access to which are
* exported by other bundles. This takes into account all constraint specifications
* from the specified bundle (Import-Package, Require-Bundle etc). A deep dependancy
* search is done for all packages which are available through the required bundles and
* any bundles which are reexported. This method also takes into account all directives
* which may be specified on the constraint specifications (e.g. uses, x-friends etc.) <p>
* The returned list will not include any packages which are exported by the system bundle
* on the behave of the running execution environment. For example, when running on a
* 1.4.2 JRE the system bundle will export the javax.xml.parsers package. These types of
* system packages will are not included in the returned list.
* @param bundle a bundle to get the list of packages for.
* @return a list of all packages that the specified bundle has access to which are
* exported by other bundles.
*/
public ExportPackageDescription[] getVisiblePackages(BundleDescription bundle);
/**
* Returns the access code that the specified <code>BundleDescription</code> has to the
* specified <code>ExportPackageDescription</code>.
* @param bundle the bundle to find the access code for
* @param export the export to find the access code for
* @return the access code to the export.
* @see StateHelper#ACCESS_ENCOURAGED
* @see StateHelper#ACCESS_DISCOURAGED
*/
public int getAccessCode(BundleDescription bundle, ExportPackageDescription export);
}
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