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The source code
/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is NetBeans. The Initial Developer of the Original
* Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
* Microsystems, Inc. All Rights Reserved.
*/
package org.netbeans.api.java.platform;
import java.util.*;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import org.openide.util.Lookup;
import org.openide.util.LookupListener;
import org.openide.util.LookupEvent;
import org.openide.modules.SpecificationVersion;
import org.netbeans.modules.java.platform.JavaPlatformProvider;
/**
* JavaPlatformManager provides access to list of installed Java Platforms in the system. It can enumerate them,
* assign serializable IDs to their instances. It also defines a `default' platform, which represents NetBeans'
* own runtime environment.
*
* @author Radko Najman, Svata Dedic, Tomas Zezula
*/
public final class JavaPlatformManager {
/**
* Property name of the installedPlatforms property
*/
public static final String PROP_INSTALLED_PLATFORMS="installedPlatforms"; //NOI18N
private static JavaPlatformManager instance = null;
private Lookup.Result/**/ providers;
private Collection/**/ lastProviders = Collections.EMPTY_SET;
private boolean providersValid = false;
private PropertyChangeListener pListener;
private Collection/**/ cachedPlatforms;
private HashSet/**/ listeners;
/** Creates a new instance of JavaPlatformManager */
public JavaPlatformManager() {
}
/** Gets an instance of JavaPlatformManager. It the instance doesn't exist it will be created.
* @return the instance of JavaPlatformManager
*/
public static synchronized JavaPlatformManager getDefault() {
if (instance == null)
instance = new JavaPlatformManager();
return instance;
}
/**
* Returns default platform. The platform the IDE is running on.
* @return JavaPlatform or null in the case when the default platform can
* not be found (e.g. the J2SEPlatform module is not installed).
*/
public JavaPlatform getDefaultPlatform() {
Collection/**/ instances = this.getProviders ();
for (Iterator it = instances.iterator(); it.hasNext();) {
JavaPlatformProvider provider = (JavaPlatformProvider) it.next();
JavaPlatform defaultPlatform = provider.getDefaultPlatform ();
if (defaultPlatform!=null) {
return defaultPlatform;
}
}
return null;
}
/** Gets an array of JavaPlatfrom objects.
* @return the array of java platform definitions.
*/
public synchronized JavaPlatform[] getInstalledPlatforms() {
if (cachedPlatforms == null) {
Collection/**/ instances = this.getProviders();
cachedPlatforms = new HashSet ();
for (Iterator it = instances.iterator(); it.hasNext(); ) {
JavaPlatformProvider provider = (JavaPlatformProvider) it.next ();
JavaPlatform[] platforms = provider.getInstalledPlatforms();
for (int i = 0; i < platforms.length; i++) {
cachedPlatforms.add (platforms[i]);
}
}
}
return (JavaPlatform[]) cachedPlatforms.toArray(new JavaPlatform[cachedPlatforms.size()]);
}
/**
* Returns platform given by display name and/or specification.
* @param platformDisplayName display name of platform or null for any name.
* @param platformSpec Specification of platform or null for platform of any type, in the specification null means all.
* Specification with null profiles means none or any profile.
* Specification with Profile(null,null) means any profile but at least 1.
* For example Specification ("CLDC", new Profile[] { new Profile("MIMDP",null), new Profile(null,null)})
* matches all CLDC platforms with MIDP profile of any versions and any additional profile.
* @return JavaPlatform[], never returns null, may return empty array when no platform matches given
* query.
*/
public JavaPlatform[] getPlatforms (String platformDisplayName, Specification platformSpec) {
JavaPlatform[] platforms = getInstalledPlatforms();
Collection/**/ result = new ArrayList ();
for (int i = 0; i < platforms.length; i++) {
String name = platforms[i].getDisplayName();
Specification spec = platforms[i].getSpecification();
if ((platformDisplayName==null || name.equalsIgnoreCase(platformDisplayName)) &&
(platformSpec == null || compatible (spec, platformSpec))) {
result.add(platforms[i]);
}
}
return (JavaPlatform[]) result.toArray(new JavaPlatform[result.size()]);
}
/**
* Adds PropertyChangeListener to the JavaPlatformManager, the listener is notified
* when the platform is added,removed or modified.
* @param l the listener, can not be null
*/
public synchronized void addPropertyChangeListener (PropertyChangeListener l) {
assert l != null : "Listener can not be null"; //NOI18N
if (this.listeners == null) {
this.listeners = new HashSet ();
}
this.listeners.add (l);
}
/**
* Removes PropertyChangeListener to the JavaPlatformManager.
* @param l the listener, can not be null
*/
public synchronized void removePropertyChangeListener (PropertyChangeListener l) {
assert l != null : "Listener can not be null"; //NOI18N
if (this.listeners == null) {
return;
}
this.listeners.remove (l);
}
private void firePropertyChange (String property) {
Iterator it;
synchronized (this) {
if (this.listeners == null) {
return;
}
it = ((Set)this.listeners.clone()).iterator();
}
PropertyChangeEvent event = new PropertyChangeEvent (this, property, null, null);
while (it.hasNext()) {
((PropertyChangeListener)it.next()).propertyChange (event);
}
}
private static boolean compatible (Specification platformSpec, Specification query) {
String name = query.getName();
SpecificationVersion version = query.getVersion();
return ((name == null || name.equalsIgnoreCase (platformSpec.getName())) &&
(version == null || version.equals (platformSpec.getVersion())) &&
compatibleProfiles (platformSpec.getProfiles(), query.getProfiles()));
}
private static boolean compatibleProfiles (Profile[] platformProfiles, Profile[] query) {
if (query == null) {
return true;
}
else if (platformProfiles == null) {
return false;
}
else {
Collection/**/ covered = new HashSet ();
for (int i=0; i*/ getProviders () {
if (!this.providersValid) {
if (this.providers == null) {
this.providers = Lookup.getDefault().lookup(new Lookup.Template(JavaPlatformProvider.class));
this.providers.addLookupListener (new LookupListener () {
public void resultChanged(LookupEvent ev) {
resetCache (true);
JavaPlatformManager.this.firePropertyChange(PROP_INSTALLED_PLATFORMS);
}
});
}
if (this.pListener == null ) {
this.pListener = new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
JavaPlatformManager.this.resetCache (false);
JavaPlatformManager.this.firePropertyChange(PROP_INSTALLED_PLATFORMS);
}
};
}
Collection/**/ instances = this.providers.allInstances();
Collection/**/ toAdd = new HashSet(instances);
toAdd.removeAll (this.lastProviders);
Collection/**/ toRemove = new HashSet(this.lastProviders);
toRemove.removeAll (instances);
for (Iterator it = toRemove.iterator(); it.hasNext();) {
JavaPlatformProvider provider = (JavaPlatformProvider) it.next ();
provider.removePropertyChangeListener (pListener);
}
for (Iterator it = toAdd.iterator(); it.hasNext();) {
JavaPlatformProvider provider = (JavaPlatformProvider) it.next ();
provider.addPropertyChangeListener (pListener);
}
this.lastProviders = instances;
providersValid = true;
}
return this.lastProviders;
}
private synchronized void resetCache (boolean resetProviders) {
JavaPlatformManager.this.cachedPlatforms = null;
this.providersValid &= !resetProviders;
}
}
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