| package org.apache.turbine.modules; |
| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001-2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache Turbine" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache Turbine", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.Iterator; |
| |
| import org.apache.commons.lang.StringUtils; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import org.apache.turbine.Turbine; |
| import org.apache.turbine.TurbineConstants; |
| import org.apache.turbine.pipeline.PipelineData; |
| import org.apache.turbine.util.RunData; |
| import org.apache.turbine.util.parser.ParameterParser; |
| import org.apache.turbine.util.parser.ParserUtils; |
| |
| /** |
| * <p> |
| * |
| * This is an alternative to the Action class that allows you to do |
| * event based actions. Essentially, you label all your submit buttons |
| * with the prefix of "eventSubmit_" and the suffix of "methodName". |
| * For example, "eventSubmit_doDelete". Then any class that subclasses |
| * this class will get its "doDelete(RunData data)" method executed. |
| * If for any reason, it was not able to execute the method, it will |
| * fall back to executing the doPeform() method which is required to |
| * be implemented. |
| * |
| * <p> |
| * |
| * Limitations: |
| * |
| * <p> |
| * |
| * Because ParameterParser makes all the key values lowercase, we have |
| * to do some work to format the string into a method name. For |
| * example, a button name eventSubmit_doDelete gets converted into |
| * eventsubmit_dodelete. Thus, we need to form some sort of naming |
| * convention so that dodelete can be turned into doDelete. |
| * |
| * <p> |
| * |
| * Thus, the convention is this: |
| * |
| * <ul> |
| * <li>The variable name MUST have the prefix "eventSubmit_".</li> |
| * <li>The variable name after the prefix MUST begin with the letters |
| * "do".</li> |
| * <li>The first letter after the "do" will be capitalized and the |
| * rest will be lowercase</li> |
| * </ul> |
| * |
| * If you follow these conventions, then you should be ok with your |
| * method naming in your Action class. |
| * |
| * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens </a> |
| * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
| * @author <a href="quintonm@bellsouth.net">Quinton McCombs</a> |
| * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> |
| * @version $Id$ |
| */ |
| public abstract class ActionEvent extends Action |
| { |
| /** Logging */ |
| protected Log log = LogFactory.getLog(this.getClass()); |
| |
| /** Constant needed for Reflection */ |
| private static final Class [] methodParams |
| = new Class [] { RunData.class }; |
| |
| /** |
| * You need to implement this in your classes that extend this class. |
| * @deprecated use PipelineData version instead. |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| public abstract void doPerform(RunData data) |
| throws Exception; |
| |
| /** |
| * You need to implement this in your classes that extend this class. |
| * This should revert to being abstract when RunData has gone. |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| public void doPerform(PipelineData pipelineData) |
| throws Exception |
| { |
| RunData data = (RunData) getRunData(pipelineData); |
| doPerform(data); |
| } |
| |
| |
| /** The name of the button to look for. */ |
| protected static final String BUTTON = "eventSubmit_"; |
| /** The length of the button to look for. */ |
| protected static final int BUTTON_LENGTH = BUTTON.length(); |
| /** The prefix of the method name. */ |
| protected static final String METHOD_NAME_PREFIX = "do"; |
| /** The length of the method name. */ |
| protected static final int METHOD_NAME_LENGTH = METHOD_NAME_PREFIX.length(); |
| /** The length of the button to look for. */ |
| protected static final int LENGTH = BUTTON.length(); |
| |
| /** |
| * If true, the eventSubmit_do<xxx> variable must contain |
| * a not null value to be executed. |
| */ |
| private boolean submitValueKey = false; |
| |
| /** |
| * If true, then exceptions raised in eventSubmit_do<xxx> methods |
| * as well as in doPerform methods are bubbled up to the Turbine |
| * servlet's handleException method. |
| */ |
| protected boolean bubbleUpException = true; |
| /** |
| * C'tor |
| */ |
| public ActionEvent() |
| { |
| super(); |
| |
| submitValueKey = Turbine.getConfiguration() |
| .getBoolean(TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_KEY, |
| TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_DEFAULT); |
| bubbleUpException = Turbine.getConfiguration() |
| .getBoolean(TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP, |
| TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP_DEFAULT); |
| |
| if (log.isDebugEnabled()){ |
| log.debug(submitValueKey |
| ? "ActionEvent accepts only eventSubmit_do Keys with a value != 0" |
| : "ActionEvent accepts all eventSubmit_do Keys"); |
| log.debug(bubbleUpException |
| ? "ActionEvent will bubble exceptions up to Turbine.handleException() method" |
| : "ActionEvent will not bubble exceptions up."); |
| } |
| } |
| |
| /** |
| * This overrides the default Action.perform() to execute the |
| * doEvent() method. If that fails, then it will execute the |
| * doPerform() method instead. |
| * @deprecated Use PipelineData version instead. |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| protected void perform(RunData data) |
| throws Exception |
| { |
| try |
| { |
| executeEvents(data); |
| } |
| catch (NoSuchMethodException e) |
| { |
| doPerform(data); |
| } |
| } |
| |
| /** |
| * This overrides the default Action.perform() to execute the |
| * doEvent() method. If that fails, then it will execute the |
| * doPerform() method instead. |
| * |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| protected void perform(PipelineData pipelineData) |
| throws Exception |
| { |
| try |
| { |
| executeEvents(pipelineData); |
| } |
| catch (NoSuchMethodException e) |
| { |
| doPerform(pipelineData); |
| } |
| } |
| |
| |
| /** |
| * This method should be called to execute the event based system. |
| * |
| * @deprecated Use PipelineData version instead. |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| public void executeEvents(RunData data) |
| throws Exception |
| { |
| // Name of the button. |
| String theButton = null; |
| // Parameter parser. |
| ParameterParser pp = data.getParameters(); |
| |
| String button = pp.convert(BUTTON); |
| String key = null; |
| |
| // Loop through and find the button. |
| for (Iterator it = pp.keySet().iterator(); it.hasNext();) |
| { |
| key = (String) it.next(); |
| if (key.startsWith(button)) |
| { |
| if (considerKey(key, pp)) |
| { |
| theButton = formatString(key); |
| break; |
| } |
| } |
| } |
| |
| if (theButton == null) |
| { |
| throw new NoSuchMethodException("ActionEvent: The button was null"); |
| } |
| |
| Method method = null; |
| |
| try |
| { |
| method = getClass().getMethod(theButton, methodParams); |
| Object[] methodArgs = new Object[] { data }; |
| |
| if (log.isDebugEnabled()) |
| { |
| log.debug("Invoking " + method); |
| } |
| |
| method.invoke(this, methodArgs); |
| } |
| catch (InvocationTargetException ite) |
| { |
| Throwable t = ite.getTargetException(); |
| log.error("Invokation of " + method , t); |
| } |
| finally |
| { |
| pp.remove(key); |
| } |
| } |
| |
| /** |
| * This method should be called to execute the event based system. |
| * |
| * @param data Turbine information. |
| * @exception Exception a generic exception. |
| */ |
| public void executeEvents(PipelineData pipelineData) |
| throws Exception |
| { |
| |
| RunData data = (RunData) getRunData(pipelineData); |
| |
| // Name of the button. |
| String theButton = null; |
| // Parameter parser. |
| ParameterParser pp = data.getParameters(); |
| |
| String button = pp.convert(BUTTON); |
| String key = null; |
| |
| // Loop through and find the button. |
| for (Iterator it = pp.keySet().iterator(); it.hasNext();) |
| { |
| key = (String) it.next(); |
| if (key.startsWith(button)) |
| { |
| if (considerKey(key, pp)) |
| { |
| theButton = formatString(key); |
| break; |
| } |
| } |
| } |
| |
| if (theButton == null) |
| { |
| throw new NoSuchMethodException("ActionEvent: The button was null"); |
| } |
| |
| Method method = null; |
| |
| try |
| { |
| method = getClass().getMethod(theButton, methodParams); |
| Object[] methodArgs = new Object[] { pipelineData }; |
| |
| if (log.isDebugEnabled()) |
| { |
| log.debug("Invoking " + method); |
| } |
| |
| method.invoke(this, methodArgs); |
| } |
| catch (InvocationTargetException ite) |
| { |
| Throwable t = ite.getTargetException(); |
| log.error("Invokation of " + method , t); |
| } |
| finally |
| { |
| pp.remove(key); |
| } |
| } |
| |
| |
| |
| /** |
| * This method does the conversion of the lowercase method name |
| * into the proper case. |
| * |
| * @param input The unconverted method name. |
| * @return A string with the method name in the proper case. |
| */ |
| protected final String formatString(String input) |
| { |
| String tmp = input; |
| |
| if (StringUtils.isNotEmpty(input)) |
| { |
| tmp = input.toLowerCase(); |
| |
| // Chop off suffixes (for image type) |
| input = (tmp.endsWith(".x") || tmp.endsWith(".y")) |
| ? input.substring(0, input.length() - 2) |
| : input; |
| |
| if (ParserUtils.getUrlFolding() |
| != ParserUtils.URL_CASE_FOLDING_NONE) |
| { |
| tmp = input.toLowerCase().substring(BUTTON_LENGTH + METHOD_NAME_LENGTH); |
| tmp = METHOD_NAME_PREFIX + StringUtils.capitalize(tmp); |
| } |
| else |
| { |
| tmp = input.substring(BUTTON_LENGTH); |
| } |
| } |
| return tmp; |
| } |
| |
| /** |
| * Checks whether the selected key really is a valid event. |
| * |
| * @param key The selected key |
| * @param pp The parameter parser to look for the key value |
| * |
| * @return true if this key is really an ActionEvent Key |
| */ |
| protected boolean considerKey(String key, ParameterParser pp) |
| { |
| if (!submitValueKey) |
| { |
| log.debug("No Value required, accepting " + key); |
| return true; |
| } |
| else |
| { |
| // If the action.eventsubmit.needsvalue key is true, |
| // events with a "0" or empty value are ignored. |
| // This can be used if you have multiple eventSubmit_do<xxx> |
| // fields in your form which are selected by client side code, |
| // e.g. JavaScript. |
| // |
| // If this key is unset or missing, nothing changes for the |
| // current behaviour. |
| // |
| String keyValue = pp.getString(key); |
| log.debug("Key Value is " + keyValue); |
| if (StringUtils.isEmpty(keyValue)) |
| { |
| log.debug("Key is empty, rejecting " + key); |
| return false; |
| } |
| |
| try |
| { |
| if (Integer.parseInt(keyValue) != 0) |
| { |
| log.debug("Integer != 0, accepting " + key); |
| return true; |
| } |
| } |
| catch (NumberFormatException nfe) |
| { |
| // Not a number. So it might be a |
| // normal Key like "continue" or "exit". Accept |
| // it. |
| log.debug("Not a number, accepting " + key); |
| return true; |
| } |
| } |
| log.debug("Rejecting " + key); |
| return false; |
| } |
| } |