org.opencms.jsp.CmsJspBean Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH & Co. KG, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.jsp;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsRequestContext;
import org.opencms.flex.CmsFlexController;
import org.opencms.i18n.CmsMessageContainer;
import org.opencms.main.CmsLog;
import org.opencms.main.CmsRuntimeException;
import org.opencms.util.CmsRequestUtil;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import org.apache.commons.logging.Log;
/**
* Superclass for OpenCms JSP beans that provides convient access
* to OpenCms core and VFS functionality.
*
* If you have large chunks of code on your JSP that you want to
* move to a Class file, consider creating a subclass of this bean.
*
* Initialize this bean at the beginning of your JSP like this:
*
* <jsp:useBean id="cmsbean" class="org.opencms.jsp.CmsJspBean">
* <% cmsbean.init(pageContext, request, response); %>
* </jsp:useBean>
*
*
*
* @since 6.0.0
*/
public class CmsJspBean {
/** The log object for this class. */
private static final Log LOG = CmsLog.getLog(CmsJspBean.class);
/** JSP page context. */
private PageContext m_context;
/** OpenCms core CmsObject. */
private CmsFlexController m_controller;
/** Flag to indicate that this bean was properly initialized. */
private boolean m_isNotInitialized;
/** Flag to indicate if we want default or custom Exception handling. */
private boolean m_isSupressingExceptions;
/** OpenCms JSP request. */
private HttpServletRequest m_request;
/** OpenCms JSP response. */
private HttpServletResponse m_response;
/**
* Empty constructor, required for every JavaBean.
*/
public CmsJspBean() {
// noop, call init() to get going
m_isSupressingExceptions = true;
m_isNotInitialized = true;
}
/**
* Returns the CmsObject from the wrapped request.
*
* This is a convenience method in case you need access to
* the CmsObject in your JSP scriplets.
*
* @return the CmsObject from the wrapped request
*/
public CmsObject getCmsObject() {
if (m_isNotInitialized) {
return null;
}
return m_controller.getCmsObject();
}
/**
* Returns the JSP page context this bean was initialized with.
*
* @return the JSP page context this bean was initialized with
*/
public PageContext getJspContext() {
return m_context;
}
/**
* Returns the request this bean was initialized with.
*
* @return the request this bean was initialized with
*/
public HttpServletRequest getRequest() {
return m_request;
}
/**
* Returns the current users OpenCms request context.
*
* @return the current users OpenCms request context
*/
public CmsRequestContext getRequestContext() {
return getCmsObject().getRequestContext();
}
/**
* Returns the response wrapped by this element.
*
* @return the response wrapped by this element
*/
public HttpServletResponse getResponse() {
return m_response;
}
/**
* Initialize this bean with the current page context, request and response.
*
* It is required to call one of the init() methods before you can use the
* instance of this bean.
*
* @param context the JSP page context object
* @param req the JSP request
* @param res the JSP response
*/
public void init(PageContext context, HttpServletRequest req, HttpServletResponse res) {
m_controller = CmsFlexController.getController(req);
if (m_controller == null) {
handleMissingFlexController();
}
m_context = context;
m_request = req;
m_response = res;
m_isNotInitialized = false;
}
/**
* Returns true if Exceptions are handled by the class instance and suppressed on the
* output page, or false if they will be thrown and have to be handled by the calling class.
*
* The default is true.
* If set to false Exceptions that occur internally will be wrapped into
* a RuntimeException and thrown to the calling class instance.
*
* @return true if Exceptions are suppressed, or
* false if they will be thrown and have to be handled by the calling class
*/
public boolean isSupressingExceptions() {
return m_isSupressingExceptions;
}
/**
* Sets the content type for the HTTP response.
*
* This method is required since JSP's are handled in a special way for included template elements,
* so {@link javax.servlet.ServletResponse#setContentType(java.lang.String)} won't work.
*
* Please note that the content type set this way is never cached in the Flex cache,
* so you must make sure to not cache the element when you use this method.
*
* @param type the type to set
*
* @see javax.servlet.ServletResponse#setContentType(java.lang.String)
*/
public void setContentType(String type) {
// set the content type on the top level response
m_controller.getTopResponse().setContentType(type);
}
/**
* Sets the status code for the HTTP response.
*
* This method is required since JSP's are handled in a special way for included template elements,
* so {@link javax.servlet.http.HttpServletResponseWrapper#setStatus(int)} won't work.
*
* Please note that the status code set this way is never cached in the Flex cache,
* so you must make sure to not cache the element when you use this method.
*
* @param status the status code to set
*
* @see javax.servlet.http.HttpServletResponseWrapper#setStatus(int)
*/
public void setStatus(int status) {
// use the request attribute to store the status
m_request.setAttribute(CmsRequestUtil.ATTRIBUTE_ERRORCODE, new Integer(status));
}
/**
* Controls if Exceptions that occur in methods of this class are suppressed (true)
* or not (false).
*
* The default is true. If set to false all Exceptions that
* occur internally will be wrapped into a RuntimeException and thrown to the calling
* class instance.
*
* @param value the value to set the Exception handing to
*/
public void setSupressingExceptions(boolean value) {
m_isSupressingExceptions = value;
}
/**
* Returns the Flex controller derived from the request this bean was initialized with.
*
* This is protected since the CmsFlexController this is really an internal OpenCms
* helper function, not part of the public OpenCms API. It must not be used on JSP pages,
* only from subclasses of this bean.
*
* @return the Flex controller derived from the request this bean was initialized with
*/
protected CmsFlexController getController() {
return m_controller;
}
/**
* Internally localizes the given CmsMessageContainer to a String.
*
* If the user request context is at hand, the user's locale will be chosen. If
* no user request context is available, the default locale is used.
*
* @param container the message container that allows localization of the represented message.
*
* @return the message String of the container argument localized to the user's locale (if available) or
* to the default locale.
*/
protected String getMessage(CmsMessageContainer container) {
CmsObject cms = getCmsObject();
String result;
if ((cms == null) || (cms.getRequestContext().getLocale() == null)) {
result = container.key();
} else {
result = container.key(cms.getRequestContext().getLocale());
}
return result;
}
/**
* Handles any exception that might occur in the context of this element to
* ensure that templates are not disturbed.
*
* @param t the Throwable that was caught
*/
protected void handleException(Throwable t) {
if (LOG.isErrorEnabled()) {
LOG.error(Messages.get().getBundle().key(Messages.LOG_ERR_JSP_BEAN_0), t);
}
if (!(m_isSupressingExceptions || getRequestContext().getCurrentProject().isOnlineProject())) {
if (LOG.isDebugEnabled()) {
// no stack trace needed since it was already logged with the "error" log message above
LOG.debug(
Messages.get().getBundle().key(Messages.LOG_DEBUG_INTERRUPTED_EXCEPTION_1, getClass().getName()));
}
String uri = null;
Throwable u = getController().getThrowable();
if (u != null) {
uri = getController().getThrowableResourceUri();
} else {
uri = getRequestContext().getUri();
}
throw new CmsRuntimeException(
Messages.get().container(Messages.ERR_RUNTIME_1, (uri != null) ? uri : getClass().getName()),
t);
}
}
/**
* This method is called when the flex controller can not be found during initialization.
*
* Override this if you are reusing old workplace classes in a context where no flex controller is available.
*/
protected void handleMissingFlexController() {
// controller not found - this request was not initialized properly
throw new CmsRuntimeException(
Messages.get().container(Messages.ERR_MISSING_CMS_CONTROLLER_1, CmsJspBean.class.getName()));
}
/**
* Returns true if this bean has not been initialized (i.e. init() has not been called so far), false otherwise.
*
* @return true if this bean has not been initialized
*/
protected boolean isNotInitialized() {
return m_isNotInitialized;
}
}