| /* |
| * 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.components.xscript; |
| |
| import org.apache.avalon.framework.activity.Disposable; |
| import org.apache.avalon.framework.component.Component; |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.apache.avalon.framework.parameters.ParameterException; |
| import org.apache.avalon.framework.parameters.Parameterizable; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.service.ServiceException; |
| import org.apache.avalon.framework.service.ServiceManager; |
| import org.apache.avalon.framework.service.Serviceable; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.avalon.framework.context.Contextualizable; |
| import org.apache.avalon.framework.context.ContextException; |
| |
| import org.apache.cocoon.environment.Request; |
| import org.apache.cocoon.environment.ObjectModelHelper; |
| import org.apache.cocoon.environment.Context; |
| import org.apache.cocoon.environment.Session; |
| import org.apache.cocoon.Constants; |
| |
| import java.util.Map; |
| |
| /** |
| * The actual implementation of the <code>XScriptManager</code> interface. |
| * |
| * @author <a href="mailto:ovidiu@cup.hp.com">Ovidiu Predescu</a> |
| * @version CVS $Id$ |
| * @since August 4, 2001 |
| */ |
| public class XScriptManagerImpl |
| extends AbstractLogEnabled |
| implements XScriptManager, Serviceable, Component, Parameterizable, Contextualizable, ThreadSafe, Disposable |
| { |
| public static final String CONTEXT = "org.apache.cocoon.components.xscript.scope"; |
| |
| /** |
| * The <code>ServiceManager</code> instance. |
| */ |
| protected ServiceManager manager; |
| |
| /** |
| * The <code>Context</code> instance. |
| */ |
| protected Context context; |
| |
| |
| public void contextualize(org.apache.avalon.framework.context.Context context) |
| throws ContextException |
| { |
| this.context = (Context)context.get(Constants.CONTEXT_ENVIRONMENT_CONTEXT); |
| } |
| |
| public void service(ServiceManager manager) throws ServiceException |
| { |
| this.manager = manager; |
| } |
| |
| public void register(XScriptObject object) { |
| try { |
| object.service(manager); |
| } catch (ServiceException ignored) { } |
| } |
| |
| public void parameterize(Parameters params) |
| throws ParameterException |
| { |
| String[] names = params.getNames(); |
| |
| XScriptVariableScope s = new XScriptVariableScope(); |
| context.setAttribute(CONTEXT, s); |
| |
| for (int i = 0; i < names.length; i++) { |
| String resourceString = params.getParameter(names[i]); |
| XScriptObject resource = new XScriptObjectFromURL(this, resourceString); |
| s.put(names[i], resource); |
| } |
| } |
| |
| public void dispose() { |
| if (context != null) { |
| context.removeAttribute(CONTEXT); |
| } |
| } |
| |
| private IllegalArgumentException |
| createAccessException(String msg, String name, int scope) |
| { |
| StringBuffer message = new StringBuffer("Cannot ").append(msg) |
| .append(" variable named '").append(name) |
| .append("' in "); |
| |
| if (scope == XScriptManager.GLOBAL_SCOPE) |
| message.append("global scope"); |
| else if (scope == XScriptManager.SESSION_SCOPE) |
| message.append("session scope"); |
| else if (scope == XScriptManager.PAGE_SCOPE) |
| message.append("page scope"); |
| else if (scope == XScriptManager.REQUEST_SCOPE) |
| message.append("request scope"); |
| else if (scope == XScriptManager.ALL_SCOPES) |
| message.append("any scope"); |
| else |
| message.append("unknown scope (").append(scope).append(")"); |
| |
| return new IllegalArgumentException(message.toString()); |
| } |
| |
| public XScriptObject get(XScriptVariableScope pageScope, |
| Map objectModel, |
| String name, |
| int scope) |
| throws IllegalArgumentException |
| { |
| XScriptObject o; |
| XScriptVariableScope s = null; |
| |
| if (scope == XScriptManager.GLOBAL_SCOPE) { |
| s = (XScriptVariableScope) ObjectModelHelper.getContext(objectModel).getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.SESSION_SCOPE) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| s = (XScriptVariableScope) request.getSession().getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.REQUEST_SCOPE) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| s = (XScriptVariableScope) request.getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.PAGE_SCOPE) { |
| s = pageScope; |
| } else if (scope == XScriptManager.ALL_SCOPES) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| |
| // Lookup in the request scope first. |
| s = (XScriptVariableScope) request.getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.get(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // No luck finding `name' in request scope, try in session scope. |
| s = (XScriptVariableScope) request.getSession().getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.get(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // No luck finding `name' in session scope, try in page scope. |
| o = pageScope.get(name); |
| if (o != null) { |
| return o; |
| } |
| // No luck finding `name' in the page scope, try the global scope. |
| s = (XScriptVariableScope) ObjectModelHelper.getContext(objectModel).getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.get(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // Not found, throw exception |
| s = null; |
| } |
| |
| if (s != null) { |
| o = s.get(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| |
| throw createAccessException("find", name, scope); |
| } |
| |
| public XScriptObject getFirst(XScriptVariableScope pageScope, |
| Map objectModel, |
| String name) |
| throws IllegalArgumentException |
| { |
| return get(pageScope, objectModel, name, ALL_SCOPES); |
| } |
| |
| public void put(XScriptVariableScope pageScope, |
| Map objectModel, |
| String name, |
| XScriptObject value, |
| int scope) |
| { |
| XScriptVariableScope s; |
| |
| if (scope == XScriptManager.GLOBAL_SCOPE) { |
| Context context = ObjectModelHelper.getContext(objectModel); |
| synchronized (context) { |
| s = (XScriptVariableScope) context.getAttribute(CONTEXT); |
| if (s == null) { |
| context.setAttribute(CONTEXT, s = new XScriptVariableScope()); |
| } |
| } |
| } else if (scope == XScriptManager.SESSION_SCOPE) { |
| Session session = ObjectModelHelper.getRequest(objectModel).getSession(); |
| synchronized (session) { |
| s = (XScriptVariableScope) session.getAttribute(CONTEXT); |
| if (s == null) { |
| session.setAttribute(CONTEXT, s = new XScriptVariableScope()); |
| } |
| } |
| } else if (scope == XScriptManager.REQUEST_SCOPE) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| synchronized (request) { |
| s = (XScriptVariableScope) request.getAttribute(CONTEXT); |
| if (s == null) { |
| request.setAttribute(CONTEXT, s = new XScriptVariableScope()); |
| } |
| } |
| } else if (scope == XScriptManager.PAGE_SCOPE) { |
| s = pageScope; |
| } else { |
| throw createAccessException("create", name, scope); |
| } |
| |
| s.put(name, value); |
| } |
| |
| public XScriptObject remove(XScriptVariableScope pageScope, |
| Map objectModel, |
| String name, |
| int scope) |
| throws IllegalArgumentException |
| { |
| XScriptObject o; |
| XScriptVariableScope s = null; |
| |
| if (scope == XScriptManager.GLOBAL_SCOPE) { |
| s = (XScriptVariableScope) ObjectModelHelper.getContext(objectModel).getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.SESSION_SCOPE) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| s = (XScriptVariableScope) request.getSession().getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.REQUEST_SCOPE) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| s = (XScriptVariableScope) request.getAttribute(CONTEXT); |
| } else if (scope == XScriptManager.PAGE_SCOPE) { |
| s = pageScope; |
| } else if (scope == XScriptManager.ALL_SCOPES) { |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| |
| // Lookup in the request scope first. |
| s = (XScriptVariableScope) request.getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.remove(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // No luck finding `name' in request scope, try in session scope. |
| s = (XScriptVariableScope) request.getSession().getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.remove(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // No luck finding `name' in session scope, try in page scope. |
| o = pageScope.remove(name); |
| if (o != null) { |
| return o; |
| } |
| // No luck finding `name' in the page scope, try the global scope. |
| s = (XScriptVariableScope) ObjectModelHelper.getContext(objectModel).getAttribute(CONTEXT); |
| if (s != null) { |
| o = s.remove(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| // Not found, throw exception |
| s = null; |
| } |
| |
| if (s != null) { |
| o = s.remove(name); |
| if (o != null) { |
| return o; |
| } |
| } |
| |
| throw createAccessException("remove", name, scope); |
| } |
| |
| public XScriptObject removeFirst(XScriptVariableScope pageScope, Map objectModel, |
| String name) |
| throws IllegalArgumentException |
| { |
| return remove(pageScope, objectModel, name, ALL_SCOPES); |
| } |
| } |
