java/javax/el/BeanELResolver.java - tomcat80 - Git at Google

 /*
  * 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.InvocationTargetException;
 import java.lang.reflect.Method;
 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 {
         String cacheSizeStr;
         if (System.getSecurityManager() == null) {
             cacheSizeStr = System.getProperty(CACHE_SIZE_PROP, "1000");
         } else {
             cacheSizeStr = AccessController.doPrivileged(
                     new PrivilegedAction<String>() {

                     @Override
                     public String run() {
                         return System.getProperty(CACHE_SIZE_PROP, "1000");
                     }
                 });
         }
         CACHE_SIZE = Integer.parseInt(cacheSizeStr);
     }

     private final boolean readOnly;

     private final ConcurrentCache<String, BeanProperties> cache =
         new ConcurrentCache<>(CACHE_SIZE);

     public BeanELResolver() {
         this.readOnly = false;
     }

     public BeanELResolver(boolean readOnly) {
         this.readOnly = readOnly;
     }

     @Override
     public Class<?> getType(ELContext context, Object base, Object property) {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return null;
         }

         context.setPropertyResolved(base, property);
         return this.property(context, base, property).getPropertyType();
     }

     @Override
     public Object getValue(ELContext context, Object base, Object property) {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return null;
         }

         context.setPropertyResolved(base, property);
         Method m = this.property(context, base, property).read(context);
         try {
             return m.invoke(base, (Object[]) null);
         } catch (InvocationTargetException e) {
             Throwable cause = e.getCause();
             Util.handleThrowable(cause);
             throw new ELException(Util.message(context, "propertyReadError",
                     base.getClass().getName(), property.toString()), cause);
         } catch (Exception e) {
             throw new ELException(e);
         }
     }

     @Override
     public void setValue(ELContext context, Object base, Object property,
             Object value) {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return;
         }

         context.setPropertyResolved(base, property);

         if (this.readOnly) {
             throw new PropertyNotWritableException(Util.message(context,
                     "resolverNotWriteable", base.getClass().getName()));
         }

         Method m = this.property(context, base, property).write(context);
         try {
             m.invoke(base, value);
         } catch (InvocationTargetException e) {
             Throwable cause = e.getCause();
             Util.handleThrowable(cause);
             throw new ELException(Util.message(context, "propertyWriteError",
                     base.getClass().getName(), property.toString()), cause);
         } catch (Exception e) {
             throw new ELException(e);
         }
     }

     /**
      * @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 = ELManager.getExpressionFactory();

         String methodName = (String) factory.coerceToType(method, String.class);

         // Find the matching method
         Method matchingMethod =
                 Util.findMethod(base.getClass(), methodName, paramTypes, params);

         Object[] parameters = Util.buildParameters(
                 matchingMethod.getParameterTypes(), matchingMethod.isVarArgs(),
                 params);

         Object result = null;
         try {
             result = matchingMethod.invoke(base, parameters);
         } catch (IllegalArgumentException | IllegalAccessException e) {
             throw new ELException(e);
         } catch (InvocationTargetException e) {
             Throwable cause = e.getCause();
             Util.handleThrowable(cause);
             throw new ELException(cause);
         }

         context.setPropertyResolved(base, method);
         return result;
     }

     @Override
     public boolean isReadOnly(ELContext context, Object base, Object property) {
         if (context == null) {
             throw new NullPointerException();
         }
         if (base == null || property == null) {
             return false;
         }

         context.setPropertyResolved(base, property);
         return this.readOnly || this.property(context, base, property).isReadOnly();
     }

     @Override
     public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
         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 (base != null) {
             return Object.class;
         }

         return null;
     }

     static final 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<>();
             try {
                 BeanInfo info = Introspector.getBeanInfo(this.type);
                 PropertyDescriptor[] pds = info.getPropertyDescriptors();
                 for (PropertyDescriptor pd: pds) {
                     this.properties.put(pd.getName(), new BeanProperty(type, pd));
                 }
                 if (System.getSecurityManager() != null) {
                     // When running with SecurityManager, some classes may be
                     // not accessible, but have accessible interfaces.
                     populateFromInterfaces(type);
                 }
             } catch (IntrospectionException ie) {
                 throw new ELException(ie);
             }
         }

         private void populateFromInterfaces(Class<?> aClass) throws IntrospectionException {
             Class<?> interfaces[] = aClass.getInterfaces();
             if (interfaces.length > 0) {
                 for (Class<?> ifs : interfaces) {
                     BeanInfo info = Introspector.getBeanInfo(ifs);
                     PropertyDescriptor[] pds = info.getPropertyDescriptors();
                     for (PropertyDescriptor pd : pds) {
                         if (!this.properties.containsKey(pd.getName())) {
                             this.properties.put(pd.getName(), new BeanProperty(
                                     this.type, pd));
                         }
                     }
                 }
             }
             Class<?> superclass = aClass.getSuperclass();
             if (superclass != null) {
                 populateFromInterfaces(superclass);
             }
         }

         private BeanProperty get(ELContext ctx, String name) {
             BeanProperty property = this.properties.get(name);
             if (property == null) {
                 throw new PropertyNotFoundException(Util.message(ctx,
                         "propertyNotFound", type.getName(), name));
             }
             return property;
         }

         public BeanProperty getBeanProperty(String name) {
             return get(null, name);
         }

         private Class<?> getType() {
             return type;
         }
     }

     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 = Util.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 = Util.getMethod(this.owner, descriptor.getWriteMethod());
                 if (this.write == null) {
                     throw new PropertyNotWritableException(Util.message(ctx,
                             "propertyNotWritable", new Object[] {
                                     owner.getName(), descriptor.getName() }));
                 }
             }
             return this.write;
         }

         private Method read(ELContext ctx) {
             if (this.read == null) {
                 this.read = Util.getMethod(this.owner, descriptor.getReadMethod());
                 if (this.read == null) {
                     throw new PropertyNotFoundException(Util.message(ctx,
                             "propertyNotReadable", new Object[] {
                                     owner.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 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<>(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);
         }

     }
 }
	/*
	* 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.InvocationTargetException;
	import java.lang.reflect.Method;
	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 {
	String cacheSizeStr;
	if (System.getSecurityManager() == null) {
	cacheSizeStr = System.getProperty(CACHE_SIZE_PROP, "1000");
	} else {
	cacheSizeStr = AccessController.doPrivileged(
	new PrivilegedAction<String>() {

	@Override
	public String run() {
	return System.getProperty(CACHE_SIZE_PROP, "1000");
	}
	});
	}
	CACHE_SIZE = Integer.parseInt(cacheSizeStr);
	}

	private final boolean readOnly;

	private final ConcurrentCache<String, BeanProperties> cache =
	new ConcurrentCache<>(CACHE_SIZE);

	public BeanELResolver() {
	this.readOnly = false;
	}

	public BeanELResolver(boolean readOnly) {
	this.readOnly = readOnly;
	}

	@Override
	public Class<?> getType(ELContext context, Object base, Object property) {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return null;
	}

	context.setPropertyResolved(base, property);
	return this.property(context, base, property).getPropertyType();
	}

	@Override
	public Object getValue(ELContext context, Object base, Object property) {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return null;
	}

	context.setPropertyResolved(base, property);
	Method m = this.property(context, base, property).read(context);
	try {
	return m.invoke(base, (Object[]) null);
	} catch (InvocationTargetException e) {
	Throwable cause = e.getCause();
	Util.handleThrowable(cause);
	throw new ELException(Util.message(context, "propertyReadError",
	base.getClass().getName(), property.toString()), cause);
	} catch (Exception e) {
	throw new ELException(e);
	}
	}

	@Override
	public void setValue(ELContext context, Object base, Object property,
	Object value) {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return;
	}

	context.setPropertyResolved(base, property);

	if (this.readOnly) {
	throw new PropertyNotWritableException(Util.message(context,
	"resolverNotWriteable", base.getClass().getName()));
	}

	Method m = this.property(context, base, property).write(context);
	try {
	m.invoke(base, value);
	} catch (InvocationTargetException e) {
	Throwable cause = e.getCause();
	Util.handleThrowable(cause);
	throw new ELException(Util.message(context, "propertyWriteError",
	base.getClass().getName(), property.toString()), cause);
	} catch (Exception e) {
	throw new ELException(e);
	}
	}

	/**
	* @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 = ELManager.getExpressionFactory();

	String methodName = (String) factory.coerceToType(method, String.class);

	// Find the matching method
	Method matchingMethod =
	Util.findMethod(base.getClass(), methodName, paramTypes, params);

	Object[] parameters = Util.buildParameters(
	matchingMethod.getParameterTypes(), matchingMethod.isVarArgs(),
	params);

	Object result = null;
	try {
	result = matchingMethod.invoke(base, parameters);
	} catch (IllegalArgumentException \| IllegalAccessException e) {
	throw new ELException(e);
	} catch (InvocationTargetException e) {
	Throwable cause = e.getCause();
	Util.handleThrowable(cause);
	throw new ELException(cause);
	}

	context.setPropertyResolved(base, method);
	return result;
	}

	@Override
	public boolean isReadOnly(ELContext context, Object base, Object property) {
	if (context == null) {
	throw new NullPointerException();
	}
	if (base == null \|\| property == null) {
	return false;
	}

	context.setPropertyResolved(base, property);
	return this.readOnly \|\| this.property(context, base, property).isReadOnly();
	}

	@Override
	public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
	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 (base != null) {
	return Object.class;
	}

	return null;
	}

	static final 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<>();
	try {
	BeanInfo info = Introspector.getBeanInfo(this.type);
	PropertyDescriptor[] pds = info.getPropertyDescriptors();
	for (PropertyDescriptor pd: pds) {
	this.properties.put(pd.getName(), new BeanProperty(type, pd));
	}
	if (System.getSecurityManager() != null) {
	// When running with SecurityManager, some classes may be
	// not accessible, but have accessible interfaces.
	populateFromInterfaces(type);
	}
	} catch (IntrospectionException ie) {
	throw new ELException(ie);
	}
	}

	private void populateFromInterfaces(Class<?> aClass) throws IntrospectionException {
	Class<?> interfaces[] = aClass.getInterfaces();
	if (interfaces.length > 0) {
	for (Class<?> ifs : interfaces) {
	BeanInfo info = Introspector.getBeanInfo(ifs);
	PropertyDescriptor[] pds = info.getPropertyDescriptors();
	for (PropertyDescriptor pd : pds) {
	if (!this.properties.containsKey(pd.getName())) {
	this.properties.put(pd.getName(), new BeanProperty(
	this.type, pd));
	}
	}
	}
	}
	Class<?> superclass = aClass.getSuperclass();
	if (superclass != null) {
	populateFromInterfaces(superclass);
	}
	}

	private BeanProperty get(ELContext ctx, String name) {
	BeanProperty property = this.properties.get(name);
	if (property == null) {
	throw new PropertyNotFoundException(Util.message(ctx,
	"propertyNotFound", type.getName(), name));
	}
	return property;
	}

	public BeanProperty getBeanProperty(String name) {
	return get(null, name);
	}

	private Class<?> getType() {
	return type;
	}
	}

	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 = Util.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 = Util.getMethod(this.owner, descriptor.getWriteMethod());
	if (this.write == null) {
	throw new PropertyNotWritableException(Util.message(ctx,
	"propertyNotWritable", new Object[] {
	owner.getName(), descriptor.getName() }));
	}
	}
	return this.write;
	}

	private Method read(ELContext ctx) {
	if (this.read == null) {
	this.read = Util.getMethod(this.owner, descriptor.getReadMethod());
	if (this.read == null) {
	throw new PropertyNotFoundException(Util.message(ctx,
	"propertyNotReadable", new Object[] {
	owner.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 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<>(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);
	}

	}
	}