com.manydesigns.elements.servlet.AttributeMap Maven / Gradle / Ivy
/*
* Copyright (C) 2005-2019 ManyDesigns srl. All rights reserved.
* http://www.manydesigns.com/
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package com.manydesigns.elements.servlet;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpSession;
import java.lang.reflect.Method;
import java.util.*;
/**
* @author Paolo Predonzani - [email protected]
* @author Angelo Lupo - [email protected]
* @author Giampiero Granatella - [email protected]
* @author Alessio Stalla - [email protected]
*/
public class AttributeMap implements Map {
public static final String copyright =
"Copyright (C) 2005-2019 ManyDesigns srl";
protected Method attributeNamesGetter;
protected Method attributeGetter;
protected Method attributeSetter;
protected Object wrappedObject;
//--------------------------------------------------------------------------
// Logger
//--------------------------------------------------------------------------
public static final Logger logger =
LoggerFactory.getLogger(AttributeMap.class);
//--------------------------------------------------------------------------
// Constructors
//--------------------------------------------------------------------------
public static AttributeMap createAttributeMap(ServletRequest request) {
return new AttributeMap(ServletRequest.class, request);
}
public static AttributeMap createAttributeMap(HttpSession session) {
return new AttributeMap(HttpSession.class, session);
}
public static AttributeMap createAttributeMap(ServletContext servletContext) {
return new AttributeMap(ServletContext.class, servletContext);
}
protected AttributeMap(Class clazz, Object wrappedObject) {
this.wrappedObject = wrappedObject;
try {
attributeNamesGetter = clazz.getMethod("getAttributeNames");
attributeGetter = clazz.getMethod("getAttribute", String.class);
attributeSetter = clazz.getMethod("setAttribute", String.class, Object.class);
} catch (NoSuchMethodException e) {
throw new Error("Required method not found", e);
}
}
//--------------------------------------------------------------------------
// Reflection
//--------------------------------------------------------------------------
protected Enumeration getAttributeNames() {
if (wrappedObject == null) {
logger.debug("Null wrapped object");
return null;
}
try {
return (Enumeration) attributeNamesGetter.invoke(wrappedObject);
} catch (Throwable e) {
logger.warn("Invocation error", e);
return Collections.enumeration(Collections.EMPTY_LIST);
}
}
protected Object getAttribute(String name) {
if (wrappedObject == null) {
logger.debug("Null wrapped object");
return null;
}
try {
return attributeGetter.invoke(wrappedObject, name);
} catch (Throwable e) {
logger.warn("Invocation error", e);
return null;
}
}
protected void setAttribute(String name, Object value) {
if (wrappedObject == null) {
logger.debug("Null wrapped object");
return;
}
try {
attributeSetter.invoke(wrappedObject, name, value);
} catch (Throwable e) {
logger.warn("Invocation error", e);
}
}
//--------------------------------------------------------------------------
// Map implementation
//--------------------------------------------------------------------------
public int size() {
int counter = 0;
Enumeration e = getAttributeNames();
while (e.hasMoreElements()) {
e.nextElement();
counter++;
}
return counter;
}
public boolean isEmpty() {
return !getAttributeNames().hasMoreElements();
}
public boolean containsKey(Object key) {
return get(key) != null;
}
public boolean containsValue(Object value) {
Enumeration e = getAttributeNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
Object keyValue = getAttribute(key);
if (keyValue == value) {
return true;
}
}
return false;
}
public Object get(Object key) {
if (!(key instanceof String)) {
return null;
}
return getAttribute((String) key);
}
public Object put(String key, @Nullable Object o) {
Object oldValue = get(key);
setAttribute(key, o);
return oldValue;
}
public Object remove(Object key) {
if (!(key instanceof String)) {
return null;
}
return put((String) key, null);
}
public void putAll(Map map) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
public Set keySet() {
Set result = new HashSet();
Enumeration e = getAttributeNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
result.add(key);
}
return result;
}
public Collection