/*
* 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 org.apache.mina.integration.ognl;
import java.util.Map;
import ognl.ObjectPropertyAccessor;
import ognl.OgnlContext;
import ognl.OgnlException;
import ognl.OgnlRuntime;
import ognl.PropertyAccessor;
/**
* An abstract OGNL {@link PropertyAccessor} for MINA constructs.
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
@SuppressWarnings("unchecked")
public abstract class AbstractPropertyAccessor extends ObjectPropertyAccessor {
static final Object READ_ONLY_MODE = new Object();
static final Object QUERY = new Object();
@Override
public final boolean hasGetProperty(OgnlContext context, Object target,
Object oname) throws OgnlException {
if (oname == null) {
return false;
}
if (hasGetProperty0(context, target, oname.toString())) {
return true;
} else {
return super.hasGetProperty(context, target, oname);
}
}
@Override
public final boolean hasSetProperty(OgnlContext context, Object target,
Object oname) throws OgnlException {
if (context.containsKey(READ_ONLY_MODE)) {
// Return true to trigger setPossibleProperty to throw an exception.
return true;
}
if (oname == null) {
return false;
}
if (hasSetProperty0(context, target, oname.toString())) {
return true;
} else {
return super.hasSetProperty(context, target, oname);
}
}
@Override
public final Object getPossibleProperty(Map context, Object target, String name)
throws OgnlException {
Object answer = getProperty0((OgnlContext) context, target, name);
if (answer == OgnlRuntime.NotFound) {
answer = super.getPossibleProperty(context, target, name);
}
return answer;
}
@Override
public final Object setPossibleProperty(Map context, Object target, String name,
Object value) throws OgnlException {
if (context.containsKey(READ_ONLY_MODE)) {
throw new OgnlException("Expression must be read-only: " + context.get(QUERY));
}
Object answer = setProperty0((OgnlContext) context, target, name, value);
if (answer == OgnlRuntime.NotFound) {
answer = super.setPossibleProperty(context, target, name, value);
}
return answer;
}
protected abstract boolean hasGetProperty0(
OgnlContext context, Object target, String name) throws OgnlException;
protected abstract boolean hasSetProperty0(
OgnlContext context, Object target, String name) throws OgnlException;
protected abstract Object getProperty0(
OgnlContext context, Object target, String name) throws OgnlException;
protected abstract Object setProperty0(
OgnlContext context, Object target, String name, Object value) throws OgnlException;
// The following methods uses the four method above, so there's no need
// to override them.
@Override
public final Object getProperty(Map context, Object target, Object oname)
throws OgnlException {
return super.getProperty(context, target, oname);
}
@Override
public final boolean hasGetProperty(Map context, Object target, Object oname)
throws OgnlException {
return super.hasGetProperty(context, target, oname);
}
@Override
public final boolean hasSetProperty(Map context, Object target, Object oname)
throws OgnlException {
return super.hasSetProperty(context, target, oname);
}
@Override
public final void setProperty(Map context, Object target, Object oname,
Object value) throws OgnlException {
super.setProperty(context, target, oname, value);
}
}