/*******************************************************************************
* Copyright (c) 2009 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
* Zend Technologies
*******************************************************************************/
package org.eclipse.php.internal.ui.preferences;
import java.util.*;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.php.internal.ui.PHPUIMessages;
import org.eclipse.php.internal.ui.PHPUiPlugin;
import org.eclipse.php.ui.preferences.IPHPPreferencePageBlock;
/**
* Registry class for all {@link IPHPPreferencePageBlock} extentions.
*
* @author shalom
*/
public class PHPPreferencePageBlocksRegistry {
private static final String EXTENSION_POINT_NAME = "phpPreferencePageBlocks"; //$NON-NLS-1$
private static final String BLOCK_TAG = "block"; //$NON-NLS-1$
// private static final String ID_ATTRIBUTE = "id";
private static final String NAME_ATTRIBUTE = "name"; //$NON-NLS-1$
private static final String CLASS_ATTRIBUTE = "class"; //$NON-NLS-1$
private static final String PAGE_ID_ATTRIBUTE = "pageId"; //$NON-NLS-1$
private static final String PDT_PREFIX = "org.eclipse.php."; //$NON-NLS-1$
/*
* PHP preferences addons stored by the ID of the PHP preferences page. This
* group of addons are for the worspace scope. Since multiple addons can be
* added to the same preferences page, the values are stored as a List.
*/
private Dictionary pageBlocks = new Hashtable();
/** Instance of this registry */
private static PHPPreferencePageBlocksRegistry instance = null;
private static Comparator pageBlockComparator = new PageBlockComparator();
private PHPPreferencePageBlocksRegistry() {
IExtensionRegistry registry = Platform.getExtensionRegistry();
IConfigurationElement[] elements = registry
.getConfigurationElementsFor(PHPUiPlugin.ID,
EXTENSION_POINT_NAME);
for (int i = 0; i < elements.length; i++) {
final IConfigurationElement element = elements[i];
if (BLOCK_TAG.equals(element.getName())) {
String preferencesPageID = element
.getAttribute(PAGE_ID_ATTRIBUTE);
addBlock(pageBlocks, preferencesPageID, element);
}
}
}
private void addBlock(Dictionary dictionary, String preferencesPageID,
IConfigurationElement element) {
List list = (List) dictionary.get(preferencesPageID);
if (list == null) {
list = new ArrayList(5);
}
list.add(new PHPPreferencePageBlocksFactory(element));
dictionary.put(preferencesPageID, list);
}
private Dictionary getPageBlocks() {
return pageBlocks;
}
private static PHPPreferencePageBlocksRegistry getInstance() {
if (instance == null) {
instance = new PHPPreferencePageBlocksRegistry();
}
return instance;
}
/**
* Return PHP preferences page workspace addons according to its ID. The
* returned {@link IPHPPreferencePageBlock} is always a new instance.
*
* @param preferencesPageID
* The PHP preferences page ID
* @return An array of newly instanciated {@link IPHPPreferencePageBlock}s
* (an empty array, if non exists). Note: The returned order of the
* addons is by their ID.
*/
public static IPHPPreferencePageBlock[] getPHPPreferencePageBlock(
String pageId) throws Exception {
List addonFactories = (List) getInstance().getPageBlocks().get(pageId);
IPHPPreferencePageBlock[] addons = getBlocks(addonFactories);
Arrays.sort(addons, pageBlockComparator);
return addons;
}
// Collect, initialize and return all the {@link IPHPPreferencePageBlock}
// from the given factories List.
private static IPHPPreferencePageBlock[] getBlocks(List addonFactories) {
if (addonFactories == null) {
return new IPHPPreferencePageBlock[0];
}
List<IPHPPreferencePageBlock> addons = new LinkedList<IPHPPreferencePageBlock>();
for (Object addonFactory : addonFactories) {
IPHPPreferencePageBlock pageBlock = ((PHPPreferencePageBlocksFactory) addonFactory)
.createPHPPreferencePageBlock();
if (pageBlock != null) {
addons.add(pageBlock);
}
}
return (IPHPPreferencePageBlock[]) addons
.toArray(new IPHPPreferencePageBlock[addons.size()]);
}
/**
* Instantiation proxy of the PHP preferences page addon object
*/
class PHPPreferencePageBlocksFactory {
private IConfigurationElement element;
private IPHPPreferencePageBlock preferencesPageBlock;
public PHPPreferencePageBlocksFactory(IConfigurationElement element) {
this.element = element;
}
public IPHPPreferencePageBlock createPHPPreferencePageBlock() {
SafeRunner.run(new SafeRunnable(
PHPUIMessages.PHPPreferencePageBlocksRegistry_0
+ PHPUiPlugin.ID + "." + EXTENSION_POINT_NAME) { //$NON-NLS-1$
public void run() throws Exception {
try {
preferencesPageBlock = (IPHPPreferencePageBlock) element
.createExecutableExtension(CLASS_ATTRIBUTE);
preferencesPageBlock.setComparableName(element
.getAttribute(NAME_ATTRIBUTE));
} catch (Exception e) {
// do nothing
}
}
});
return preferencesPageBlock;
}
}
static class PageBlockComparator implements Comparator {
public int compare(Object o1, Object o2) {
IPHPPreferencePageBlock firstBlock = (IPHPPreferencePageBlock) o1;
IPHPPreferencePageBlock secondBlock = (IPHPPreferencePageBlock) o2;
if (firstBlock != null && secondBlock != null) {
boolean firstIsPDT = firstBlock.getClass().getName()
.startsWith(PDT_PREFIX);
boolean secondIsPDT = secondBlock.getClass().getName()
.startsWith(PDT_PREFIX);
if (firstIsPDT) {
if (!secondIsPDT) {
return -1;
}
} else {
if (secondIsPDT) {
return 1;
}
}
return firstBlock.getComparableName().compareTo(
secondBlock.getComparableName());
}
if (firstBlock == null) {
return secondBlock == null ? 0 : -1;
}
return 1;
}
}
}