| /* |
| * 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 javax.el; |
| |
| import java.lang.reflect.Method; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * @since EL 3.0 |
| */ |
| public class StandardELContext extends ELContext { |
| |
| private final ELContext wrappedContext; |
| private final VariableMapper variableMapper; |
| private final FunctionMapper functionMapper; |
| private final CompositeELResolver standardResolver; |
| private final CompositeELResolver customResolvers; |
| private final Map<String,Object> localBeans = new HashMap<>(); |
| |
| |
| public StandardELContext(ExpressionFactory factory) { |
| wrappedContext = null; |
| variableMapper = new StandardVariableMapper(); |
| functionMapper = |
| new StandardFunctionMapper(factory.getInitFunctionMap()); |
| standardResolver = new CompositeELResolver(); |
| customResolvers = new CompositeELResolver(); |
| |
| ELResolver streamResolver = factory.getStreamELResolver(); |
| |
| // Add resolvers in order |
| standardResolver.add(new BeanNameELResolver( |
| new StandardBeanNameResolver(localBeans))); |
| standardResolver.add(customResolvers); |
| if (streamResolver != null) { |
| standardResolver.add(streamResolver); |
| } |
| standardResolver.add(new StaticFieldELResolver()); |
| standardResolver.add(new MapELResolver()); |
| standardResolver.add(new ResourceBundleELResolver()); |
| standardResolver.add(new ListELResolver()); |
| standardResolver.add(new ArrayELResolver()); |
| standardResolver.add(new BeanELResolver()); |
| } |
| |
| public StandardELContext(ELContext context) { |
| wrappedContext = context; |
| variableMapper = context.getVariableMapper(); |
| functionMapper = context.getFunctionMapper(); |
| standardResolver = new CompositeELResolver(); |
| customResolvers = new CompositeELResolver(); |
| |
| // Add resolvers in order |
| standardResolver.add(new BeanNameELResolver( |
| new StandardBeanNameResolver(localBeans))); |
| standardResolver.add(customResolvers); |
| // Use resolvers from context from this point on |
| standardResolver.add(context.getELResolver()); |
| } |
| |
| // Can't use Class<?> because API needs to match specification |
| @Override |
| public void putContext(@SuppressWarnings("rawtypes") Class key, |
| Object contextObject) { |
| if (wrappedContext == null) { |
| super.putContext(key, contextObject); |
| } else { |
| wrappedContext.putContext(key, contextObject); |
| } |
| } |
| |
| @Override |
| public Object getContext(@SuppressWarnings("rawtypes") Class key) { |
| if (wrappedContext == null) { |
| return super.getContext(key); |
| } else { |
| return wrappedContext.getContext(key); |
| } |
| } |
| |
| @Override |
| public ELResolver getELResolver() { |
| return standardResolver; |
| } |
| |
| public void addELResolver(ELResolver resolver) { |
| customResolvers.add(resolver); |
| } |
| |
| @Override |
| public FunctionMapper getFunctionMapper() { |
| return functionMapper; |
| } |
| |
| @Override |
| public VariableMapper getVariableMapper() { |
| return variableMapper; |
| } |
| |
| |
| Map<String,Object> getLocalBeans() { |
| return localBeans; |
| } |
| |
| |
| private static class StandardVariableMapper extends VariableMapper { |
| |
| private Map<String, ValueExpression> vars; |
| |
| @Override |
| public ValueExpression resolveVariable(String variable) { |
| if (vars == null) { |
| return null; |
| } |
| return vars.get(variable); |
| } |
| |
| @Override |
| public ValueExpression setVariable(String variable, |
| ValueExpression expression) { |
| if (vars == null) |
| vars = new HashMap<>(); |
| if (expression == null) { |
| return vars.remove(variable); |
| } else { |
| return vars.put(variable, expression); |
| } |
| } |
| } |
| |
| |
| private static class StandardBeanNameResolver extends BeanNameResolver { |
| |
| private final Map<String,Object> beans; |
| |
| public StandardBeanNameResolver(Map<String,Object> beans) { |
| this.beans = beans; |
| } |
| |
| @Override |
| public boolean isNameResolved(String beanName) { |
| return beans.containsKey(beanName); |
| } |
| |
| @Override |
| public Object getBean(String beanName) { |
| return beans.get(beanName); |
| } |
| |
| @Override |
| public void setBeanValue(String beanName, Object value) |
| throws PropertyNotWritableException { |
| beans.put(beanName, value); |
| } |
| |
| @Override |
| public boolean isReadOnly(String beanName) { |
| return false; |
| } |
| |
| @Override |
| public boolean canCreateBean(String beanName) { |
| return true; |
| } |
| } |
| |
| |
| private static class StandardFunctionMapper extends FunctionMapper { |
| |
| private final Map<String,Method> methods = new HashMap<>(); |
| |
| public StandardFunctionMapper(Map<String,Method> initFunctionMap) { |
| if (initFunctionMap != null) { |
| methods.putAll(initFunctionMap); |
| } |
| } |
| |
| @Override |
| public Method resolveFunction(String prefix, String localName) { |
| String key = prefix + ':' + localName; |
| return methods.get(key); |
| } |
| |
| @Override |
| public void mapFunction(String prefix, String localName, |
| Method method) { |
| String key = prefix + ':' + localName; |
| if (method == null) { |
| methods.remove(key); |
| } else { |
| methods.put(key, method); |
| } |
| } |
| } |
| } |