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/*
* $Id: ComponentDefinition.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.struts.tiles;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.tiles.xmlDefinition.XmlDefinition;
import org.apache.struts.util.RequestUtils;
/**
* Definition of a template / component attributes.
* Attributes of a component can be defined with the help of this class.
* An instance of this class can be used as a bean, and passed to 'insert' tag.
*/
public class ComponentDefinition implements Serializable {
/**
* Commons Logging instance.
*/
protected static Log log = LogFactory.getLog(ComponentDefinition.class);
/**
* Definition name
*/
protected String name = null;
/**
* Component / template path (URL).
*/
protected String path = null;
/**
* Attributes defined for the component.
*/
protected Map attributes = null;
/**
* Role associated to definition.
*/
protected String role = null;
/** Associated Controller URL or classname, if defined */
protected String controller = null;
/**
* Associated Controller typename, if controllerName defined.
* Can be CONTROLLER, ACTION or URL, or null.
*/
protected String controllerType = null;
/**
* Controller name type.
*/
public static final String URL = "url";
/**
* Controller name type.
*/
public static final String CONTROLLER = "controller";
/**
* Controller name type.
*/
public static final String ACTION = "action";
/**
* Controller associated to Definition.
* Lazy creation : only on first request
*/
private Controller controllerInstance = null;
/**
* Constructor.
*/
public ComponentDefinition() {
attributes = new HashMap();
}
/**
* Copy Constructor.
* Create a new definition initialized with parent definition.
* Do a shallow copy : attributes are shared between copies, but not the Map
* containing attributes.
*/
public ComponentDefinition(ComponentDefinition definition) {
attributes = new HashMap(definition.getAttributes());
this.name = definition.getName();
this.path = definition.getPath();
this.role = definition.getRole();
this.controllerInstance = definition.getControllerInstance();
this.controller = definition.getController();
this.controllerType = definition.getControllerType();
}
/**
* Constructor.
* Create a new definition initialized from a RawDefinition.
* Raw definitions are used to read definition from a data source (xml file, db, ...).
* A RawDefinition mainly contains properties of type String, while Definition
* contains more complex type (ex : Controller).
* Do a shallow copy : attributes are shared between objects, but not the Map
* containing attributes.
* OO Design issues : Actually RawDefinition (XmlDefinition) extends ComponentDefinition.
* This must not be the case. I have do it because I am lazy.
* @throws InstantiationException if an error occur while instanciating Controller :
* (classname can't be instanciated, Illegal access with instanciated class,
* Error while instanciating class, classname can't be instanciated.
*/
public ComponentDefinition(XmlDefinition definition) {
this((ComponentDefinition) definition);
}
/**
* Constructor.
*/
public ComponentDefinition(String name, String path, Map attributes) {
this.name = name;
this.path = path;
this.attributes = attributes;
}
/**
* Access method for the name property.
*
* @return the current value of the name property
*/
public String getName() {
return name;
}
/**
* Sets the value of the name property.
*
* @param aName the new value of the name property
*/
public void setName(String aName) {
name = aName;
}
/**
* Access method for the path property.
*
* @return The current value of the path property.
*/
public String getPage() {
return path;
}
/**
* Sets the value of the path property.
*
* @param page the new value of the path property
*/
public void setPage(String page) {
path = page;
}
/**
* Access method for the path property.
*
* @return the current value of the path property
*/
public String getPath() {
return path;
}
/**
* Sets the value of the path property.
*
* @param aPath the new value of the path property
*/
public void setPath(String aPath) {
path = aPath;
}
/**
* Access method for the template property.
* Same as getPath()
* @return the current value of the template property
*/
public String getTemplate() {
return path;
}
/**
* Sets the value of the template property.
* Same as setPath()
*
* @param template the new value of the path property
*/
public void setTemplate(String template) {
path = template;
}
/**
* Access method for the role property.
* @return the current value of the role property
*/
public String getRole() {
return role;
}
/**
* Sets the value of the role property.
*
* @param role the new value of the path property
*/
public void setRole(String role) {
this.role = role;
}
/**
* Access method for the attributes property.
* If there is no attributes, return an empty map.
* @return the current value of the attributes property
*/
public Map getAttributes() {
return attributes;
}
/**
* Returns the value of the named attribute as an Object, or null if no
* attribute of the given name exists.
*
* @return requested attribute or null if not found
*/
public Object getAttribute(String key) {
return attributes.get(key);
}
/**
* Put a new attribute in this component
*
* @param key String key for attribute
* @param value Attibute value.
*/
public void putAttribute(String key, Object value) {
attributes.put(key, value);
}
/**
* Put an attribute in component / template definition.
* Attribute can be used as content for tag get.
* @param name Attribute name
* @param content Attribute value
*/
public void put(String name, Object content) {
put(name, content, false, null);
}
/**
* Put an attribute in template definition.
* Attribute can be used as content for tag get.
* @param name Attribute name
* @param content Attribute value �
* @param direct Determines how content is handled by get tag: true means content is printed directly; false, the default, means content is included
*/
public void put(String name, Object content, boolean direct) {
put(name, content, direct, null);
}
/**
* Put an attribute in template definition.
* Attribute can be used as content for tag get.
* @param name Attribute name
* @param content Attribute value
* @param direct Determines how content is handled by get tag: true means content is printed directly; false, the default, means content is included
* @param role Determine if content is used by get tag. If user is in role, content is used.
*/
public void put(String name, Object content, boolean direct, String role) {
if (direct == true) { // direct String
put(name, content, "string", role);
} else {
put(name, content, "template", role);
}
}
/**
* Put an attribute in template definition.
* Attribute can be used as content for tag get.
* @param name Attribute name
* @param content Attribute value
* @param type attribute type: template, string, definition
* @param role Determine if content is used by get tag. If user is in role, content is used.
*/
public void put(String name, Object content, String type, String role) {
// Is there a type set ?
// First check direct attribute, and translate it to a valueType.
// Then, evaluate valueType, and create requested typed attribute.
AttributeDefinition attribute = null;
if (content != null
&& type != null
&& !(content instanceof AttributeDefinition)) {
String strValue = content.toString();
if (type.equalsIgnoreCase("string")) {
attribute = new DirectStringAttribute(strValue);
} else if (type.equalsIgnoreCase("page")) {
attribute = new PathAttribute(strValue);
} else if (type.equalsIgnoreCase("template")) {
attribute = new PathAttribute(strValue);
} else if (type.equalsIgnoreCase("instance")) {
attribute = new DefinitionNameAttribute(strValue);
} else if (type.equalsIgnoreCase("definition")) {
attribute = new DefinitionNameAttribute(strValue);
}
}
putAttribute(name, attribute);
}
/**
* Returns a description of the attributes.
*/
public String toString() {
return "{name="
+ name
+ ", path="
+ path
+ ", role="
+ role
+ ", controller="
+ controller
+ ", controllerType="
+ controllerType
+ ", controllerInstance="
+ controllerInstance
+ ", attributes="
+ attributes
+ "}\n";
}
/**
* Get associated controller type.
* Type denote a fully qualified classname.
*/
public String getControllerType() {
return controllerType;
}
/**
* Set associated controller type.
* Type denote a fully qualified classname.
* @param controllerType Typeof associated controller
*/
public void setControllerType(String controllerType) {
this.controllerType = controllerType;
}
/**
* Set associated controller name as an url, and controller
* type as "url".
* Name must be an url (not checked).
* Convenience method.
* @param controller Controller url
*/
public void setControllerUrl(String controller) {
setController(controller);
setControllerType("url");
}
/**
* Set associated controller name as a classtype, and controller
* type as "classname".
* Name denote a fully qualified classname
* Convenience method.
* @param controller Controller classname.
*/
public void setControllerClass(String controller) {
setController(controller);
setControllerType("classname");
}
/**
* Get associated controller local URL.
* URL should be local to webcontainer in order to allow request context followup.
* URL comes as a string.
*/
public String getController() {
return controller;
}
/**
* Set associated controller URL.
* URL should be local to webcontainer in order to allow request context followup.
* URL is specified as a string.
* @param url Url called locally
*/
public void setController(String url) {
this.controller = url;
}
/**
* Get controller instance.
* @return controller instance.
*/
public Controller getControllerInstance() {
return controllerInstance;
}
/**
* Get or create controller.
* Get controller, create it if necessary.
* @return controller if controller or controllerType is set, null otherwise.
* @throws InstantiationException if an error occur while instanciating Controller :
* (classname can't be instanciated, Illegal access with instanciated class,
* Error while instanciating class, classname can't be instanciated.
*/
public Controller getOrCreateController() throws InstantiationException {
if (controllerInstance != null) {
return controllerInstance;
}
// Do we define a controller ?
if (controller == null && controllerType == null) {
return null;
}
// check parameters
if (controllerType != null && controller == null) {
throw new InstantiationException("Controller name should be defined if controllerType is set");
}
controllerInstance = createController(controller, controllerType);
return controllerInstance;
}
/**
* Set controller.
*/
public void setControllerInstance(Controller controller) {
this.controllerInstance = controller;
}
/**
* Create a new instance of controller named in parameter.
* If controllerType is specified, create controller accordingly.
* Otherwise, if name denote a classname, create an instance of it. If class is
* subclass of org.apache.struts.action.Action, wrap controller
* appropriately.
* Otherwise, consider name as an url.
* @param name Controller name (classname, url, ...)
* @param controllerType Expected Controller type
* @return org.apache.struts.tiles.Controller
* @throws InstantiationException if an error occur while instanciating Controller :
* (classname can't be instanciated, Illegal access with instanciated class,
* Error while instanciating class, classname can't be instanciated.
*/
public static Controller createController(String name, String controllerType)
throws InstantiationException {
if (log.isDebugEnabled()) {
log.debug("Create controller name=" + name + ", type=" + controllerType);
}
Controller controller = null;
if (controllerType == null) { // first try as a classname
try {
return createControllerFromClassname(name);
} catch (InstantiationException ex) { // ok, try something else
controller = new UrlController(name);
}
} else if ("url".equalsIgnoreCase(controllerType)) {
controller = new UrlController(name);
} else if ("classname".equalsIgnoreCase(controllerType)) {
controller = createControllerFromClassname(name);
}
return controller;
}
/**
* Create a controller from specified classname
* @param classname Controller classname.
* @return org.apache.struts.tiles.Controller
* @throws InstantiationException if an error occur while instanciating Controller :
* (classname can't be instanciated, Illegal access with instanciated class,
* Error while instanciating class, classname can't be instanciated.
*/
public static Controller createControllerFromClassname(String classname)
throws InstantiationException {
try {
Class requestedClass = RequestUtils.applicationClass(classname);
Object instance = requestedClass.newInstance();
if (log.isDebugEnabled()) {
log.debug("Controller created : " + instance);
}
return (Controller) instance;
} catch (java.lang.ClassNotFoundException ex) {
throw new InstantiationException(
"Error - Class not found :" + ex.getMessage());
} catch (java.lang.IllegalAccessException ex) {
throw new InstantiationException(
"Error - Illegal class access :" + ex.getMessage());
} catch (java.lang.InstantiationException ex) {
throw ex;
} catch (java.lang.ClassCastException ex) {
throw new InstantiationException(
"Controller of class '"
+ classname
+ "' should implements 'Controller' or extends 'Action'");
}
}
}
