package com.cognifide.slice.api.tag;
/*-
* #%L
* Slice - Core API
* $Id:$
* $HeadURL:$
* %%
* Copyright (C) 2012 Cognifide Limited
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import javax.servlet.ServletRequest;
import javax.servlet.jsp.PageContext;
import org.apache.commons.lang.StringUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.scripting.SlingScriptHelper;
import com.cognifide.slice.api.context.ContextProvider;
import com.cognifide.slice.api.injector.InjectorWithContext;
import com.cognifide.slice.api.injector.InjectorsRepository;
import com.cognifide.slice.api.provider.ModelProvider;
import com.cognifide.slice.util.InjectorNameUtil;
public final class SliceTagUtils {
private final static String SLICE_INJECTOR_NAME = "SLICE_INJECTOR_NAME";
private SliceTagUtils() {
// hidden constructor
}
public static <T> T getFromCurrentPath(final PageContext pageContext, final Class<T> type) {
return getFromCurrentPath(pageContext, type, null);
}
public static <T> T getFromCurrentPath(final PageContext pageContext, final Class<T> type,
final String appName) {
final SlingHttpServletRequest request = SliceTagUtils.slingRequestFrom(pageContext);
final InjectorsRepository injectorsRepository = SliceTagUtils.injectorsRepositoryFrom(pageContext);
final ContextProvider contextProvider = SliceTagUtils.contextProviderFrom(pageContext);
return getFromCurrentPath(request, injectorsRepository, contextProvider, type, appName);
}
public static <T> T getFromCurrentPath(final SlingHttpServletRequest request,
final InjectorsRepository injectorsRepository, final ContextProvider contextProvider,
final Class<T> type) {
return getFromCurrentPath(request, injectorsRepository, contextProvider, type, null);
}
public static <T> T getFromCurrentPath(final SlingHttpServletRequest request,
final InjectorsRepository injectorsRepository, final ContextProvider contextProvider,
final Class<T> type, final String appName) {
final String injectorName = getInjectorName(request, appName);
if (StringUtils.isBlank(injectorName)) {
throw new IllegalStateException("Guice injector name not available");
} else {
request.setAttribute(SLICE_INJECTOR_NAME, injectorName);
}
if (null == contextProvider) {
throw new IllegalStateException("ContextProvider is not available");
}
final InjectorWithContext injector = injectorsRepository.getInjector(injectorName);
if (injector == null) {
throw new IllegalStateException("Guice injector not found: " + injectorName);
}
injector.pushContextProvider(contextProvider);
try {
final ModelProvider modelProvider = injector.getInstance(ModelProvider.class);
final Resource resource = request.getResource();
return (T) modelProvider.get(type, resource);
} finally {
injector.popContextProvider();
}
}
@SuppressWarnings("deprecation")
private static String getInjectorName(final SlingHttpServletRequest request, final String appName) {
String injectorName;
if (StringUtils.isNotBlank(appName)) {
injectorName = appName;
} else {
String cachedInjectorName = (String) request.getAttribute(SLICE_INJECTOR_NAME);
if (StringUtils.isNotBlank(cachedInjectorName)) {
injectorName = cachedInjectorName;
} else {
injectorName = InjectorNameUtil.getFromRequest(request);
}
}
return injectorName;
}
public static SlingHttpServletRequest slingRequestFrom(final PageContext pageContext) {
return (SlingHttpServletRequest) pageContext.getRequest();
}
public static ContextProvider contextProviderFrom(final PageContext pageContext) {
final SlingScriptHelper slingScriptHelper = getSlingScriptHelper(pageContext);
return slingScriptHelper.getService(ContextProvider.class);
}
public static InjectorsRepository injectorsRepositoryFrom(final PageContext pageContext) {
final SlingScriptHelper slingScriptHelper = getSlingScriptHelper(pageContext);
return slingScriptHelper.getService(InjectorsRepository.class);
}
private static SlingScriptHelper getSlingScriptHelper(final PageContext pageContext) {
ServletRequest request = pageContext.getRequest();
SlingBindings bindings = (SlingBindings) request.getAttribute(SlingBindings.class.getName());
return bindings.getSling();
}
}