| /* |
| * 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.beans.BeanInfo; |
| import java.beans.FeatureDescriptor; |
| import java.beans.IntrospectionException; |
| import java.beans.Introspector; |
| import java.beans.PropertyDescriptor; |
| import java.lang.reflect.Array; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| |
| public class BeanELResolver extends ELResolver { |
| |
| private final boolean readOnly; |
| |
| private final ConcurrentCache<String, BeanProperties> cache = new ConcurrentCache<String, BeanProperties>( |
| 1000); |
| |
| public BeanELResolver() { |
| this.readOnly = false; |
| } |
| |
| public BeanELResolver(boolean readOnly) { |
| this.readOnly = readOnly; |
| } |
| |
| public Object getValue(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| if (base == null || property == null) { |
| return null; |
| } |
| |
| context.setPropertyResolved(true); |
| Method m = this.property(context, base, property).read(context); |
| try { |
| return m.invoke(base, (Object[]) null); |
| } catch (IllegalAccessException e) { |
| throw new ELException(e); |
| } catch (InvocationTargetException e) { |
| throw new ELException(message(context, "propertyReadError", |
| new Object[] { base.getClass().getName(), |
| property.toString() }), e.getCause()); |
| } catch (Exception e) { |
| throw new ELException(e); |
| } |
| } |
| |
| public Class<?> getType(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| if (base == null || property == null) { |
| return null; |
| } |
| |
| context.setPropertyResolved(true); |
| return this.property(context, base, property).getPropertyType(); |
| } |
| |
| public void setValue(ELContext context, Object base, Object property, |
| Object value) throws NullPointerException, |
| PropertyNotFoundException, PropertyNotWritableException, |
| ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| if (base == null || property == null) { |
| return; |
| } |
| |
| context.setPropertyResolved(true); |
| |
| if (this.readOnly) { |
| throw new PropertyNotWritableException(message(context, |
| "resolverNotWriteable", new Object[] { base.getClass() |
| .getName() })); |
| } |
| |
| Method m = this.property(context, base, property).write(context); |
| try { |
| m.invoke(base, value); |
| } catch (IllegalAccessException e) { |
| throw new ELException(e); |
| } catch (InvocationTargetException e) { |
| throw new ELException(message(context, "propertyWriteError", |
| new Object[] { base.getClass().getName(), |
| property.toString() }), e.getCause()); |
| } catch (Exception e) { |
| throw new ELException(e); |
| } |
| } |
| |
| public boolean isReadOnly(ELContext context, Object base, Object property) |
| throws NullPointerException, PropertyNotFoundException, ELException { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| if (base == null || property == null) { |
| return false; |
| } |
| |
| context.setPropertyResolved(true); |
| return this.readOnly |
| || this.property(context, base, property).isReadOnly(); |
| } |
| |
| public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base == null) { |
| return null; |
| } |
| |
| try { |
| BeanInfo info = Introspector.getBeanInfo(base.getClass()); |
| PropertyDescriptor[] pds = info.getPropertyDescriptors(); |
| for (PropertyDescriptor pd : pds) { |
| pd.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE); |
| pd.setValue(TYPE, pd.getPropertyType()); |
| } |
| return Arrays.asList((FeatureDescriptor[]) pds).iterator(); |
| } catch (IntrospectionException e) { |
| // |
| } |
| |
| return null; |
| } |
| |
| public Class<?> getCommonPropertyType(ELContext context, Object base) { |
| if (context == null) { |
| throw new NullPointerException(); |
| } |
| |
| if (base != null) { |
| return Object.class; |
| } |
| |
| return null; |
| } |
| |
| protected final static class BeanProperties { |
| private final Map<String, BeanProperty> properties; |
| |
| private final Class<?> type; |
| |
| public BeanProperties(Class<?> type) throws ELException { |
| this.type = type; |
| this.properties = new HashMap<String, BeanProperty>(); |
| try { |
| BeanInfo info = Introspector.getBeanInfo(this.type); |
| PropertyDescriptor[] pds = info.getPropertyDescriptors(); |
| for (PropertyDescriptor pd : pds) { |
| this.properties.put(pd.getName(), new BeanProperty( |
| type, pd)); |
| } |
| } catch (IntrospectionException ie) { |
| throw new ELException(ie); |
| } |
| } |
| |
| private BeanProperty get(ELContext ctx, String name) { |
| BeanProperty property = this.properties.get(name); |
| if (property == null) { |
| throw new PropertyNotFoundException(message(ctx, |
| "propertyNotFound", |
| new Object[] { type.getName(), name })); |
| } |
| return property; |
| } |
| |
| public BeanProperty getBeanProperty(String name) { |
| return get(null, name); |
| } |
| |
| private Class<?> getType() { |
| return type; |
| } |
| } |
| |
| protected final static class BeanProperty { |
| private final Class<?> type; |
| |
| private final Class<?> owner; |
| |
| private final PropertyDescriptor descriptor; |
| |
| private Method read; |
| |
| private Method write; |
| |
| public BeanProperty(Class<?> owner, PropertyDescriptor descriptor) { |
| this.owner = owner; |
| this.descriptor = descriptor; |
| this.type = descriptor.getPropertyType(); |
| } |
| |
| public Class getPropertyType() { |
| return this.type; |
| } |
| |
| public boolean isReadOnly() { |
| return this.write == null |
| && (null == (this.write = getMethod(this.owner, descriptor.getWriteMethod()))); |
| } |
| |
| public Method getWriteMethod() { |
| return write(null); |
| } |
| |
| public Method getReadMethod() { |
| return this.read(null); |
| } |
| |
| private Method write(ELContext ctx) { |
| if (this.write == null) { |
| this.write = getMethod(this.owner, descriptor.getWriteMethod()); |
| if (this.write == null) { |
| throw new PropertyNotFoundException(message(ctx, |
| "propertyNotWritable", new Object[] { |
| type.getName(), descriptor.getName() })); |
| } |
| } |
| return this.write; |
| } |
| |
| private Method read(ELContext ctx) { |
| if (this.read == null) { |
| this.read = getMethod(this.owner, descriptor.getReadMethod()); |
| if (this.read == null) { |
| throw new PropertyNotFoundException(message(ctx, |
| "propertyNotReadable", new Object[] { |
| type.getName(), descriptor.getName() })); |
| } |
| } |
| return this.read; |
| } |
| } |
| |
| private BeanProperty property(ELContext ctx, Object base, |
| Object property) { |
| Class<?> type = base.getClass(); |
| String prop = property.toString(); |
| |
| BeanProperties props = this.cache.get(type.getName()); |
| if (props == null || type != props.getType()) { |
| props = new BeanProperties(type); |
| this.cache.put(type.getName(), props); |
| } |
| |
| return props.get(ctx, prop); |
| } |
| |
| private static Method getMethod(Class type, Method m) { |
| if (m == null || Modifier.isPublic(type.getModifiers())) { |
| return m; |
| } |
| Class[] inf = type.getInterfaces(); |
| Method mp; |
| for (Class anInf : inf) { |
| try { |
| mp = anInf.getMethod(m.getName(), m.getParameterTypes()); |
| mp = getMethod(mp.getDeclaringClass(), mp); |
| if (mp != null) { |
| return mp; |
| } |
| } catch (NoSuchMethodException e) { |
| //continue |
| } |
| } |
| Class sup = type.getSuperclass(); |
| if (sup != null) { |
| try { |
| mp = sup.getMethod(m.getName(), m.getParameterTypes()); |
| mp = getMethod(mp.getDeclaringClass(), mp); |
| if (mp != null) { |
| return mp; |
| } |
| } catch (NoSuchMethodException e) { |
| //continue |
| } |
| } |
| return null; |
| } |
| |
| private final static class ConcurrentCache<K,V> { |
| |
| private final int size; |
| private final Map<K,V> eden; |
| private final Map<K,V> longterm; |
| |
| public ConcurrentCache(int size) { |
| this.size = size; |
| this.eden = new ConcurrentHashMap<K,V>(size); |
| this.longterm = new WeakHashMap<K,V>(size); |
| } |
| |
| public V get(K key) { |
| V value = this.eden.get(key); |
| if (value == null) { |
| value = this.longterm.get(key); |
| if (value != null) { |
| this.eden.put(key, value); |
| } |
| } |
| return value; |
| } |
| |
| public void put(K key, V value) { |
| if (this.eden.size() >= this.size) { |
| this.longterm.putAll(this.eden); |
| this.eden.clear(); |
| } |
| this.eden.put(key, value); |
| } |
| |
| } |
| |
| public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) { |
| if (context == null) { |
| throw new NullPointerException("ELContext could not be nulll"); |
| } |
| // Why static invocation is not supported |
| if (base == null || method == null) { |
| return null; |
| } |
| |
| String methodName = ELUtils.coerceToString(method); |
| if (methodName.length() == 0) { |
| throw new MethodNotFoundException("The parameter method could not be zero-length"); |
| } |
| Class<?> targetClass = base.getClass(); |
| if (methodName.equals("<init>") || methodName.equals("<cinit>")) { |
| throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName()); |
| } |
| |
| if (params == null) { |
| params = new Object[0]; |
| } |
| |
| Method targetMethod = null; |
| if (paramTypes == null) { |
| int paramsNumber = params.length; |
| Method[] methods = targetClass.getMethods(); |
| for (Method m : methods) { |
| if (m.getName().equals(methodName) && m.getParameterTypes().length == paramsNumber) { |
| targetMethod = m; |
| break; |
| } |
| } |
| if (targetMethod == null) { |
| for (Method m : methods) { |
| if (m.getName().equals(methodName) && m.isVarArgs() && paramsNumber >= (m.getParameterTypes().length - 1)) { |
| targetMethod = m; |
| break; |
| } |
| } |
| } |
| } else { |
| try { |
| targetMethod = targetClass.getMethod(methodName, paramTypes); |
| } catch (SecurityException e) { |
| throw new ELException(e); |
| } catch (NoSuchMethodException e) { |
| throw new MethodNotFoundException(e); |
| } |
| } |
| if (targetMethod == null) { |
| throw new MethodNotFoundException(method + " is not found in target class " + targetClass.getName()); |
| } |
| if (paramTypes == null) { |
| paramTypes = targetMethod.getParameterTypes(); |
| } |
| //Initial check whether the types and parameter values length |
| if (targetMethod.isVarArgs()) { |
| if (paramTypes.length - 1 > params.length) { |
| throw new IllegalArgumentException("Inconsistent number between argument types and values"); |
| } |
| } else if (paramTypes.length != params.length) { |
| throw new IllegalArgumentException("Inconsistent number between argument types and values"); |
| } |
| try { |
| Object[] finalParamValues = new Object[paramTypes.length]; |
| //Only do the parameter conversion while the method is not a non-parameter one |
| if (paramTypes.length > 0) { |
| ExpressionFactory expressionFactory = null; |
| if (ELUtils.isCachedExpressionFactoryEnabled()) { |
| expressionFactory = ELUtils.getCachedExpressionFactory(); |
| } |
| if (expressionFactory == null) { |
| expressionFactory = ExpressionFactory.newInstance(); |
| } |
| |
| int iCurrentIndex = 0; |
| for (int iLoopSize = paramTypes.length - 1; iCurrentIndex < iLoopSize; iCurrentIndex++) { |
| finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]); |
| } |
| /** |
| * Not sure it is over-designed. Do not find detailed description about how the parameter values are passed if the method is of variable arguments. |
| * It might be an array directly passed or each parameter value passed one by one. |
| */ |
| if (targetMethod.isVarArgs()) { |
| // varArgsClassType should be an array type |
| Class<?> varArgsClassType = paramTypes[iCurrentIndex]; |
| // 1. If there is no parameter value left for the variable argument, create a zero-length array |
| // 2. If there is only one parameter value left for the variable argument, and it has the same array type with the varArgsClass, pass in directly |
| // 3. Else, create an array of varArgsClass type, and add all the left coerced parameter values |
| if (iCurrentIndex == params.length) { |
| finalParamValues[iCurrentIndex] = Array.newInstance(varArgsClassType.getComponentType(), 0); |
| } else if (iCurrentIndex == params.length - 1 && varArgsClassType == params[iCurrentIndex].getClass() |
| && varArgsClassType.getClassLoader() == params[iCurrentIndex].getClass().getClassLoader()) { |
| finalParamValues[iCurrentIndex] = params[iCurrentIndex]; |
| } else { |
| Object targetArray = Array.newInstance(varArgsClassType.getComponentType(), params.length - iCurrentIndex); |
| Class<?> componentClassType = varArgsClassType.getComponentType(); |
| for (int i = 0, iLoopSize = params.length - iCurrentIndex; i < iLoopSize; i++) { |
| Array.set(targetArray, i, expressionFactory.coerceToType(params[iCurrentIndex + i], componentClassType)); |
| } |
| finalParamValues[iCurrentIndex] = targetArray; |
| } |
| } else { |
| finalParamValues[iCurrentIndex] = expressionFactory.coerceToType(params[iCurrentIndex], paramTypes[iCurrentIndex]); |
| } |
| } |
| Object retValue = targetMethod.invoke(base, finalParamValues); |
| context.setPropertyResolved(true); |
| return retValue; |
| } catch (IllegalAccessException e) { |
| throw new ELException(e); |
| } catch (InvocationTargetException e) { |
| throw new ELException(e.getCause()); |
| } |
| } |
| } |