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/*******************************************************************************
* Copyright (c) 2001, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.validation.internal.plugin;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.wst.validation.internal.IProjectValidationHelper;
public class ValidationHelperRegistryReader {
/** validationHelper - extension point name. */
public static final String VALIDATION_HELPER = "validationHelper"; //$NON-NLS-1$
static final String ATT_ID = "id"; //$NON-NLS-1$
/** helperClass - class that implements the extension. */
static final String ATT_HELPER_CLASS = "helperClass"; //$NON-NLS-1$
private static ValidationHelperRegistryReader INSTANCE = null;
private List<IProjectValidationHelper> _validationHelpers;
public ValidationHelperRegistryReader() {
}
public static ValidationHelperRegistryReader getInstance() {
if (INSTANCE == null) {
INSTANCE = new ValidationHelperRegistryReader();
INSTANCE.readRegistry();
}
return INSTANCE;
}
/**
* Read the extension point and parse it.
*/
public void readRegistry() {
IExtensionPoint point = Platform.getExtensionRegistry()
.getExtensionPoint(ValidationPlugin.PLUGIN_ID, VALIDATION_HELPER);
if (point == null)return;
IConfigurationElement[] elements = point.getConfigurationElements();
for (int i = 0; i < elements.length; i++) {
internalReadElement(elements[i]);
}
}
private void internalReadElement(IConfigurationElement element) {
boolean recognized = this.readElement(element);
if (!recognized) {
logError(element, "Error processing extension: " + element); //$NON-NLS-1$
}
}
/*
* Logs the error in the desktop log using the provided text and the information in the configuration element.
*/
protected void logError(IConfigurationElement element, String text) {
IExtension extension = element.getDeclaringExtension();
StringBuffer buf = new StringBuffer();
buf.append("Plugin " + extension.getContributor().getName() + ", extension " + extension.getExtensionPointUniqueIdentifier()); //$NON-NLS-1$ //$NON-NLS-2$
buf.append("\n" + text); //$NON-NLS-1$
ValidationPlugin.getPlugin().logMessage(IStatus.ERROR, buf.toString());
}
private List<IProjectValidationHelper> getValidationHelpers() {
if (_validationHelpers == null)
_validationHelpers = new ArrayList<IProjectValidationHelper>();
return _validationHelpers;
}
public boolean readElement(IConfigurationElement element) {
if (!element.getName().equals(VALIDATION_HELPER))
return false;
IProjectValidationHelper helper = null;
try {
helper = (IProjectValidationHelper) element.createExecutableExtension(ATT_HELPER_CLASS);
getValidationHelpers().add(helper);
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public IProjectValidationHelper getValidationHelper() {
if (getValidationHelpers().isEmpty())return null;
return getValidationHelpers().get(0);
}
}
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