Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $
You can buy this project and download/modify it how often you want.
javax.el.BeanELResolver Maven / Gradle / Ivy
/*
* 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.security.AccessController;
import java.security.PrivilegedAction;
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 static final int CACHE_SIZE;
private static final String CACHE_SIZE_PROP =
"org.apache.el.BeanELResolver.CACHE_SIZE";
static {
if (System.getSecurityManager() == null) {
CACHE_SIZE = Integer.parseInt(
System.getProperty(CACHE_SIZE_PROP, "1000"));
} else {
CACHE_SIZE = AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public Integer run() {
return Integer.valueOf(
System.getProperty(CACHE_SIZE_PROP, "1000"));
}
}).intValue();
}
}
private final boolean readOnly;
private final ConcurrentCache cache =
new ConcurrentCache(CACHE_SIZE);
public BeanELResolver() {
this.readOnly = false;
}
public BeanELResolver(boolean readOnly) {
this.readOnly = readOnly;
}
@Override
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);
}
}
@Override
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();
}
@Override
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);
}
}
@Override
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();
}
@Override
public Iterator 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 (int i = 0; i < pds.length; i++) {
pds[i].setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
pds[i].setValue(TYPE, pds[i].getPropertyType());
}
return Arrays.asList((FeatureDescriptor[]) pds).iterator();
} catch (IntrospectionException e) {
//
}
return null;
}
@Override
public Class getCommonPropertyType(ELContext context, Object base) {
if (context == null) {
throw new NullPointerException();
}
if (base != null) {
return Object.class;
}
return null;
}
protected static final class BeanProperties {
private final Map properties;
private final Class type;
public BeanProperties(Class type) throws ELException {
this.type = type;
this.properties = new HashMap();
try {
BeanInfo info = Introspector.getBeanInfo(this.type);
PropertyDescriptor[] pds = info.getPropertyDescriptors();
for (int i = 0; i < pds.length; i++) {
this.properties.put(pds[i].getName(), new BeanProperty(
type, pds[i]));
}
} 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 static final 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();
}
// Can't use Class because API needs to match specification
@SuppressWarnings("rawtypes")
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 final 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 final Method getMethod(Class type, Method m) {
if (m == null || Modifier.isPublic(type.getModifiers())) {
return m;
}
Class[] inf = type.getInterfaces();
Method mp = null;
for (int i = 0; i < inf.length; i++) {
try {
mp = inf[i].getMethod(m.getName(), m.getParameterTypes());
mp = getMethod(mp.getDeclaringClass(), mp);
if (mp != null) {
return mp;
}
} catch (NoSuchMethodException e) {
// Ignore
}
}
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) {
// Ignore
}
}
return null;
}
private static final class ConcurrentCache {
private final int size;
private final Map eden;
private final Map longterm;
public ConcurrentCache(int size) {
this.size = size;
this.eden = new ConcurrentHashMap(size);
this.longterm = new WeakHashMap(size);
}
public V get(K key) {
V value = this.eden.get(key);
if (value == null) {
synchronized (longterm) {
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) {
synchronized (longterm) {
this.longterm.putAll(this.eden);
}
this.eden.clear();
}
this.eden.put(key, value);
}
}
/**
* @since EL 2.2
*/
@Override
public Object invoke(ELContext context, Object base, Object method,
Class[] paramTypes, Object[] params) {
if (context == null) {
throw new NullPointerException();
}
if (base == null || method == null) {
return null;
}
ExpressionFactory factory = ExpressionFactory.newInstance();
String methodName = (String) factory.coerceToType(method, String.class);
// Find the matching method
Method matchingMethod = null;
Class clazz = base.getClass();
if (paramTypes != null) {
try {
matchingMethod = clazz.getMethod(methodName, paramTypes);
} catch (NoSuchMethodException e) {
throw new MethodNotFoundException(e);
}
} else {
int paramCount = 0;
if (params != null) {
paramCount = params.length;
}
Method[] methods = clazz.getMethods();
for (Method m : methods) {
if (m.getParameterTypes().length == paramCount) {
// Same number of parameters - use the first match
matchingMethod = m;
break;
}
if (m.isVarArgs()) {
matchingMethod = m;
}
}
if (matchingMethod == null) {
throw new MethodNotFoundException(
"Unable to find method [" + methodName + "] with ["
+ paramCount + "] parameters");
}
}
Class[] parameterTypes = matchingMethod.getParameterTypes();
Object[] parameters = null;
if (parameterTypes.length > 0) {
parameters = new Object[parameterTypes.length];
@SuppressWarnings("null") // params.length >= parameterTypes.length
int paramCount = params.length;
if (matchingMethod.isVarArgs()) {
int varArgIndex = parameterTypes.length - 1;
// First argCount-1 parameters are standard
for (int i = 0; (i < varArgIndex - 1); i++) {
parameters[i] = factory.coerceToType(params[i],
parameterTypes[i]);
}
// Last parameter is the varags
Class varArgClass =
parameterTypes[varArgIndex].getComponentType();
for (int i = (varArgIndex); i < paramCount; i++) {
Object varargs = Array.newInstance(
parameterTypes[paramCount],
(paramCount - varArgIndex));
Array.set(varargs, i,
factory.coerceToType(params[i], varArgClass));
parameters[varArgIndex] = varargs;
}
} else {
parameters = new Object[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
parameters[i] = factory.coerceToType(params[i],
parameterTypes[i]);
}
}
}
Object result = null;
try {
result = matchingMethod.invoke(base, parameters);
} catch (IllegalArgumentException e) {
throw new ELException(e);
} catch (IllegalAccessException e) {
throw new ELException(e);
} catch (InvocationTargetException e) {
throw new ELException(e.getCause());
}
context.setPropertyResolved(true);
return result;
}
}
