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/*
* #%L
* JAXX :: Runtime
* %%
* Copyright (C) 2008 - 2017 CodeLutin
* %%
* This program 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 program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
package org.nuiton.jaxx.runtime.context;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nuiton.jaxx.runtime.JAXXContext;
import org.nuiton.jaxx.runtime.JAXXObject;
import org.nuiton.jaxx.runtime.JAXXUtil;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
/**
* The default {@link JAXXContext} to be used in a {@link JAXXObject} by
* delegation.
*
* The values are store in a {@link Map} but we can not use directly the values
* as key.
*
* Because, it does not work if we add for the same object multi entries (named
* and unamed)...
*
* We prefer use as entry the {@link JAXXContextEntryDef} associated with the
* value.
*
* @author Tony Chemit - [email protected]
*/
public class DefaultJAXXContext implements JAXXContext {
/** entry of the parent context */
protected static final JAXXContextEntryDef
PARENT_CONTEXT_ENTRY = JAXXUtil.newContextEntryDef(JAXXContext.class);
/** Logger */
static private final Log log = LogFactory.getLog(DefaultJAXXContext.class);
/** le context parent */
protected JAXXContext parentContext;
/** les données contenues dans le context */
protected final Map, Object> data;
public DefaultJAXXContext() {
data = new HashMap<>();
}
@Override
public void setContextValue(T o) {
setContextValue(o, null);
}
@Override
public void setContextValue(T o, String name) {
if (name == null && PARENT_CONTEXT_ENTRY.accept2(o.getClass(), null)) {
setParentContext((JAXXContext) o);
return;
}
JAXXContextEntryDef entry = getKey(name, o.getClass());
// first remove entry
Object oldValue = remove0(o.getClass(), name);
if (oldValue != null) {
if (log.isDebugEnabled()) {
log.debug("remove value " + oldValue.getClass() + " for " +
entry);
}
}
// then can put safely
data.put(entry, o);
}
@Override
public T getContextValue(Class clazz) {
return getContextValue(clazz, null);
}
@SuppressWarnings({"unchecked"})
@Override
public T getContextValue(Class clazz, String name) {
if (parentContext != null &&
parentContext.getClass().equals(clazz) ||
PARENT_CONTEXT_ENTRY.accept(clazz, name)) {
return (T) getParentContext();
}
for (Entry, Object> entry : data.entrySet()) {
if (entry.getKey().accept(clazz, name)) {
return (T) entry.getValue();
}
}
// no value found in this context, will try in the parent context
if (JAXXContext.class.equals(clazz)) {
// no seek in the parent context, since we are already looking
// for it
return null;
}
JAXXContext parent = getParentContext();
if (parent == null) {
// no parent context, so no value find
return null;
}
// seek in parent context
return parent.getContextValue(clazz, name);
}
@Override
public void removeContextValue(Class klazz) {
removeContextValue(klazz, null);
}
@Override
public void removeContextValue(Class klazz, String name) {
remove0(klazz, name);
}
/**
* Obtain all the keys of data for a given type.
*
* @param klass the type of searched keys
* @return the array of all names of keys for the given type of data
* @since 1.3
*/
public String[] getKeys(Class klass) {
List keys = new ArrayList<>();
for (JAXXContextEntryDef key : data.keySet()) {
if (key.getKlass().equals(klass)) {
keys.add(key.getName());
}
}
return keys.toArray(new String[keys.size()]);
}
public void clear() {
data.clear();
}
protected JAXXContextEntryDef getKey(String name, Class klass) {
//FIXME-TC20100322 : must change this to have a store, we instanciate
// a new object each time we wants to deal with the context...
return JAXXUtil.newContextEntryDef(name, klass);
}
@SuppressWarnings({"unchecked"})
protected T remove0(Class klass, String name) {
if (PARENT_CONTEXT_ENTRY.accept(klass, name)) {
JAXXContext old = getParentContext();
setParentContext(null);
return (T) old;
}
JAXXContextEntryDef entry = getEntry(klass, name);
// JAXXContextEntryDef entry = null;
// for (JAXXContextEntryDef entryDef : data.keySet()) {
// if (entryDef.accept(klass, name)) {
// entry = entryDef;
// break;
// }
// }
if (entry != null) {
return (T) data.remove(entry);
}
if (JAXXContext.class.equals(klass)) {
return null;
}
// try on parent
JAXXContext parent = getParentContext();
if (parent == null) {
// no parent, stop now, can not found entry
return null;
}
if (parent instanceof DefaultJAXXContext) {
// try now on the parent
return ((DefaultJAXXContext) parent).remove0(klass, name);
}
// can not find the entry anywhere, so says that nothing was removed
return null;
}
protected JAXXContextEntryDef getEntry(Class klass, String name) {
JAXXContextEntryDef entry = null;
for (JAXXContextEntryDef entryDef : data.keySet()) {
if (entryDef.accept(klass, name)) {
entry = entryDef;
break;
}
}
return entry;
}
protected JAXXContext getParentContext() {
return parentContext;
}
protected void setParentContext(JAXXContext parentContext) {
if (parentContext instanceof JAXXObject) {
// keep the real context, not the ui
parentContext = ((JAXXObject) parentContext).getDelegateContext();
}
this.parentContext = parentContext;
}
}
