| /* |
| * $Id$ |
| * |
| * 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.tiles.mvel; |
| |
| import java.util.HashMap; |
| |
| import org.apache.tiles.context.TilesRequestContext; |
| import org.apache.tiles.context.TilesRequestContextHolder; |
| import org.mvel2.UnresolveablePropertyException; |
| import org.mvel2.integration.VariableResolver; |
| import org.mvel2.integration.impl.BaseVariableResolverFactory; |
| |
| /** |
| * Resolves beans stored in request, session and application scopes. |
| * |
| * @version $Rev$ $Date$ |
| * @since 2.2.0 |
| */ |
| public class TilesContextBeanVariableResolverFactory extends |
| BaseVariableResolverFactory { |
| |
| /** |
| * The Tiles request holder. |
| */ |
| private TilesRequestContextHolder requestHolder; |
| |
| /** |
| * Constructor. |
| * |
| * @param requestHolder The Tiles request holder. |
| * @since 2.2.0 |
| */ |
| public TilesContextBeanVariableResolverFactory(TilesRequestContextHolder requestHolder) { |
| this.requestHolder = requestHolder; |
| variableResolvers = new HashMap<String, VariableResolver>(); |
| } |
| |
| /** {@inheritDoc} */ |
| public VariableResolver createVariable(String name, Object value) { |
| if (nextFactory != null) { |
| return nextFactory.createVariable(name, value); |
| } |
| throw new UnsupportedOperationException("This variable resolver factory is read only"); |
| } |
| |
| /** {@inheritDoc} */ |
| public VariableResolver createVariable(String name, Object value, |
| Class<?> type) { |
| variableResolvers = new HashMap<String, VariableResolver>(); |
| if (nextFactory != null) { |
| return nextFactory.createVariable(name, value, type); |
| } |
| throw new UnsupportedOperationException("This variable resolver factory is read only"); |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean isResolveable(String name) { |
| return isTarget(name) || isNextResolveable(name); |
| } |
| |
| /** {@inheritDoc} */ |
| public VariableResolver getVariableResolver(String name) { |
| if (isResolveable(name)) { |
| if (variableResolvers != null && variableResolvers.containsKey(name)) { |
| return variableResolvers.get(name); |
| } else if (isTarget(name)) { |
| VariableResolver variableResolver = new TilesContextBeanVariableResolver(name); |
| variableResolvers.put(name, variableResolver); |
| return variableResolver; |
| } else if (nextFactory != null) { |
| return nextFactory.getVariableResolver(name); |
| } |
| } |
| |
| throw new UnresolveablePropertyException("unable to resolve variable '" + name + "'"); |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean isTarget(String name) { |
| TilesRequestContext request = requestHolder.getTilesRequestContext(); |
| return request.getRequestScope().containsKey(name) |
| || request.getSessionScope().containsKey(name) |
| || request.getApplicationContext().getApplicationScope() |
| .containsKey(name); |
| } |
| |
| /** |
| * Resolves a single attribute stored in request, session or application scope. |
| * |
| * @version $Rev$ $Date$ |
| * @since 2.2.0 |
| */ |
| private class TilesContextBeanVariableResolver implements VariableResolver { |
| |
| /** |
| * The name of the attribute. |
| */ |
| private String name; |
| |
| /** |
| * Constructor. |
| * |
| * @param name The name of the attribute. |
| * @since 2.2.0 |
| */ |
| public TilesContextBeanVariableResolver(String name) { |
| this.name = name; |
| } |
| |
| /** {@inheritDoc} */ |
| public int getFlags() { |
| return 0; |
| } |
| |
| /** {@inheritDoc} */ |
| public String getName() { |
| return name; |
| } |
| |
| /** {@inheritDoc} */ |
| @SuppressWarnings("unchecked") |
| public Class getType() { |
| Object value = getValue(); |
| if (value != null) { |
| return value.getClass(); |
| } |
| return Object.class; |
| } |
| |
| /** {@inheritDoc} */ |
| public Object getValue() { |
| TilesRequestContext request = requestHolder.getTilesRequestContext(); |
| Object value = request.getRequestScope().get(name); |
| if (value == null) { |
| value = request.getSessionScope().get(name); |
| if (value == null) { |
| value = request.getApplicationContext() |
| .getApplicationScope().get(name); |
| } |
| } |
| return value; |
| } |
| |
| /** {@inheritDoc} */ |
| @SuppressWarnings("unchecked") |
| public void setStaticType(Class type) { |
| // Does nothing for the moment. |
| } |
| |
| /** {@inheritDoc} */ |
| public void setValue(Object value) { |
| throw new UnsupportedOperationException("This resolver is read-only"); |
| } |
| } |
| } |