/*
* 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.cocoon.environment;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.avalon.framework.parameters.ParameterException;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.cocoon.components.flow.FlowHelper;
import org.apache.commons.jxpath.DynamicPropertyHandler;
import org.apache.commons.jxpath.JXPathBeanInfo;
import org.apache.commons.jxpath.JXPathIntrospector;
/**
* This is an utility class to create an object model which is similar to the one
* used in flow, that can be used from every component.
*
* Work-in-progress, derived from JXTemplateGenerator
*
* @version $Id: TemplateObjectModelHelper.java 359757 2005-12-29 08:53:30Z cziegeler $
*/
public class TemplateObjectModelHelper {
/** Avoid instantiation */
private TemplateObjectModelHelper() {}
public static void fillContext(Object contextObject, Map map) {
// Hack: I use jxpath to populate the context object's properties
// in the jexl context
final JXPathBeanInfo bi =
JXPathIntrospector.getBeanInfo(contextObject.getClass());
if (bi.isDynamic()) {
Class cl = bi.getDynamicPropertyHandlerClass();
try {
DynamicPropertyHandler h =
(DynamicPropertyHandler) cl.newInstance();
String[] result = h.getPropertyNames(contextObject);
int len = result.length;
for (int i = 0; i < len; i++) {
try {
map.put(result[i], h.getProperty(contextObject, result[i]));
} catch (Exception exc) {
exc.printStackTrace();
}
}
} catch (Exception ignored) {
ignored.printStackTrace();
}
} else {
PropertyDescriptor[] props = bi.getPropertyDescriptors();
int len = props.length;
for (int i = 0; i < len; i++) {
try {
Method read = props[i].getReadMethod();
if (read != null) {
map.put(props[i].getName(),
read.invoke(contextObject, null));
}
} catch (Exception ignored) {
ignored.printStackTrace();
}
}
}
}
/**
* Create the object model.
* Currently the object model is a map with one single entry:
* cocoon + request The Request Object
* + session The Session (if available)
* + context The Context
* + continuation The Continuation (if available)
* + parameters The parameters (if provided)
*/
public static Map getTemplateObjectModel(final Map objectModel,
final Parameters parameters) {
// first create the "cocoon object":
final Map cocoon = new HashMap();
// cocoon.request
final Request request = ObjectModelHelper.getRequest( objectModel );
cocoon.put("request", request);
// cocoon.session
final Session session = request.getSession(false);
if (session != null) {
cocoon.put("session", session);
}
// cocoon.context
final org.apache.cocoon.environment.Context context =
ObjectModelHelper.getContext( objectModel );
cocoon.put("context", context);
// cocoon.continuation
final Object cont = FlowHelper.getWebContinuation(objectModel);
if ( cont != null ) {
cocoon.put("continuation", cont);
}
// cocoon.parameters
if ( parameters != null ) {
cocoon.put("parameters", new ParametersMap(parameters));
}
final Map map = new HashMap();
map.put("cocoon", cocoon);
// Now add objects from flow context (if any)
final Object contextObject = FlowHelper.getContextObject(objectModel);
if (contextObject instanceof Map) {
map.putAll((Map)contextObject);
} else if ( contextObject != null ) {
fillContext(contextObject, map);
}
return map;
}
protected static final class ParametersMap extends Parameters implements Map {
protected final Parameters wrappedParameters;
protected Map map;
public ParametersMap(Parameters wrapped) {
wrappedParameters = wrapped;
}
public boolean equals(Object arg0) {
return wrappedParameters.equals(arg0);
}
public String[] getNames() {
return wrappedParameters.getNames();
}
public String getParameter(String arg0, String arg1) {
return wrappedParameters.getParameter(arg0, arg1);
}
public String getParameter(String arg0) throws ParameterException {
return wrappedParameters.getParameter(arg0);
}
public boolean getParameterAsBoolean(String arg0, boolean arg1) {
return wrappedParameters.getParameterAsBoolean(arg0, arg1);
}
public boolean getParameterAsBoolean(String arg0) throws ParameterException {
return wrappedParameters.getParameterAsBoolean(arg0);
}
public float getParameterAsFloat(String arg0, float arg1) {
return wrappedParameters.getParameterAsFloat(arg0, arg1);
}
public float getParameterAsFloat(String arg0) throws ParameterException {
return wrappedParameters.getParameterAsFloat(arg0);
}
public int getParameterAsInteger(String arg0, int arg1) {
return wrappedParameters.getParameterAsInteger(arg0, arg1);
}
public int getParameterAsInteger(String arg0) throws ParameterException {
return wrappedParameters.getParameterAsInteger(arg0);
}
public long getParameterAsLong(String arg0, long arg1) {
return wrappedParameters.getParameterAsLong(arg0, arg1);
}
public long getParameterAsLong(String arg0) throws ParameterException {
return wrappedParameters.getParameterAsLong(arg0);
}
public Iterator getParameterNames() {
return wrappedParameters.getParameterNames();
}
public int hashCode() {
return wrappedParameters.hashCode();
}
public boolean isParameter(String arg0) {
return wrappedParameters.isParameter(arg0);
}
public void makeReadOnly() {
wrappedParameters.makeReadOnly();
}
public Parameters merge(Parameters arg0) {
return wrappedParameters.merge(arg0);
}
public void removeParameter(String arg0) {
wrappedParameters.removeParameter(arg0);
}
public String setParameter(String arg0, String arg1) throws IllegalStateException {
return wrappedParameters.setParameter(arg0, arg1);
}
public void clear() {
this.checkWriteable();
}
protected Map getMap() {
if ( this.map == null ) {
this.map = new HashMap();
String[] names = this.getNames();
for(int i=0; i<names.length;i++) {
map.put(names[i], this.getParameter(names[i], null));
}
}
return this.map;
}
public boolean containsKey(Object arg0) {
if ( arg0 == null ) {
return false;
}
return this.getParameter(arg0.toString(), null) != null;
}
public boolean containsValue(Object arg0) {
return this.getMap().containsValue(arg0);
}
public Set entrySet() {
return this.getMap().entrySet();
}
public Object get(Object arg0) {
if ( arg0 == null ) {
return null;
}
return this.getParameter(arg0.toString(), null);
}
public boolean isEmpty() {
return this.getNames().length == 0;
}
public Set keySet() {
return this.getMap().keySet();
}
public Object put(Object arg0, Object arg1) {
this.checkWriteable();
return null;
}
public void putAll(Map arg0) {
this.checkWriteable();
}
public Object remove(Object arg0) {
this.checkWriteable();
return null;
}
public int size() {
return this.getNames().length;
}
public Collection values() {
return this.getMap().values();
}
}
}