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/*******************************************************************************
* Copyright (c) 2005, 2010 Cognos Incorporated, 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:
* Cognos Incorporated - initial API and implementation
* IBM Corporation - bug fixes and enhancements
*******************************************************************************/
package org.eclipse.equinox.http.registry.internal;
import java.io.IOException;
import java.util.*;
import javax.servlet.*;
import javax.servlet.Filter;
import org.eclipse.core.runtime.*;
import org.osgi.framework.*;
public class FilterManager implements ExtensionPointTracker.Listener {
private static final String FILTERS_EXTENSION_POINT = "org.eclipse.equinox.http.registry.filters"; //$NON-NLS-1$
private static final String HTTPCONTEXT_NAME = "httpcontext-name"; //$NON-NLS-1$
private static final String PARAM_VALUE = "value"; //$NON-NLS-1$
private static final String PARAM_NAME = "name"; //$NON-NLS-1$
private static final String INIT_PARAM = "init-param"; //$NON-NLS-1$
private static final String ALIAS = "alias"; //$NON-NLS-1$
private static final String LOAD_ON_STARTUP = "load-on-startup"; //$NON-NLS-1$
private static final String HTTPCONTEXT_ID = "httpcontextId"; //$NON-NLS-1$
private static final String SERVICESELECTOR = "serviceSelector"; //$NON-NLS-1$
private static final String CLASS = "class"; //$NON-NLS-1$
private static final String FILTER = "filter"; //$NON-NLS-1$
private ExtensionPointTracker tracker;
private HttpRegistryManager httpRegistryManager;
private Map registered = new HashMap();
private ServiceReference reference;
public FilterManager(HttpRegistryManager httpRegistryManager, ServiceReference reference, IExtensionRegistry registry) {
this.httpRegistryManager = httpRegistryManager;
this.reference = reference;
tracker = new ExtensionPointTracker(registry, FILTERS_EXTENSION_POINT, this);
}
public void start() {
tracker.open();
}
public void stop() {
tracker.close();
}
public void added(IExtension extension) {
IConfigurationElement[] elements = extension.getConfigurationElements();
for (int i = 0; i < elements.length; i++) {
IConfigurationElement serviceSelectorElement = elements[i];
if (!SERVICESELECTOR.equals(serviceSelectorElement.getName()))
continue;
org.osgi.framework.Filter serviceSelector = null;
String clazz = serviceSelectorElement.getAttribute(CLASS);
if (clazz != null) {
try {
serviceSelector = (org.osgi.framework.Filter) serviceSelectorElement.createExecutableExtension(CLASS);
} catch (CoreException e) {
// log it.
e.printStackTrace();
return;
}
} else {
String filter = serviceSelectorElement.getAttribute(FILTER);
if (filter == null)
return;
try {
serviceSelector = FrameworkUtil.createFilter(filter);
} catch (InvalidSyntaxException e) {
// log it.
e.printStackTrace();
return;
}
}
if (!serviceSelector.match(reference))
return;
break;
}
for (int i = 0; i < elements.length; i++) {
IConfigurationElement filterElement = elements[i];
if (!FILTER.equals(filterElement.getName()))
continue;
FilterWrapper wrapper = new FilterWrapper(filterElement);
String alias = filterElement.getAttribute(ALIAS);
if (alias == null)
continue; // alias is mandatory - ignore this.
Dictionary initparams = new Hashtable();
IConfigurationElement[] initParams = filterElement.getChildren(INIT_PARAM);
for (int j = 0; j < initParams.length; ++j) {
String paramName = initParams[j].getAttribute(PARAM_NAME);
String paramValue = initParams[j].getAttribute(PARAM_VALUE);
initparams.put(paramName, paramValue);
}
boolean loadOnStartup = Boolean.valueOf(filterElement.getAttribute(LOAD_ON_STARTUP)).booleanValue();
if (loadOnStartup)
wrapper.setLoadOnStartup();
String httpContextId = filterElement.getAttribute(HTTPCONTEXT_ID);
if (httpContextId == null) {
httpContextId = filterElement.getAttribute(HTTPCONTEXT_NAME);
}
if (httpContextId != null && httpContextId.indexOf('.') == -1)
httpContextId = filterElement.getNamespaceIdentifier() + "." + httpContextId; //$NON-NLS-1$
if (httpRegistryManager.addFilterContribution(alias, wrapper, initparams, httpContextId, extension.getContributor()))
registered.put(filterElement, wrapper);
}
}
public void removed(IExtension extension) {
IConfigurationElement[] elements = extension.getConfigurationElements();
for (int i = 0; i < elements.length; i++) {
IConfigurationElement filterElement = elements[i];
Filter filter = (Filter) registered.remove(filterElement);
if (filter != null)
httpRegistryManager.removeFilterContribution(filter);
}
}
private static class FilterWrapper implements Filter {
private IConfigurationElement element;
private Filter delegate;
private FilterConfig config;
private boolean loadOnStartup = false;
public FilterWrapper(IConfigurationElement element) {
this.element = element;
}
public void setLoadOnStartup() {
this.loadOnStartup = true;
}
public void init(FilterConfig filterConfig) throws ServletException {
this.config = filterConfig;
if (loadOnStartup)
initializeDelegate();
}
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain chain) throws ServletException, IOException {
initializeDelegate();
delegate.doFilter(arg0, arg1, chain);
}
public void destroy() {
destroyDelegate();
}
private synchronized void initializeDelegate() throws ServletException {
if (delegate == null) {
try {
Filter newDelegate = (Filter) element.createExecutableExtension(CLASS);
newDelegate.init(config);
delegate = newDelegate;
} catch (CoreException e) {
throw new ServletException(e);
}
}
}
private synchronized void destroyDelegate() {
if (delegate != null) {
Filter doomedDelegate = delegate;
delegate = null;
doomedDelegate.destroy();
}
}
}
}
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