/*
* 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.commons.scxml2.env;
import java.io.Serializable;
import java.util.AbstractMap;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.scxml2.Context;
/**
* A map that will back the effective {@link Context} for an {@link org.apache.commons.scxml2.Evaluator} execution.
* The effective context enables the chaining of contexts all the way from the current state node to the root.
*/
public final class EffectiveContextMap extends AbstractMap<String, Object> implements Serializable {
private static final long serialVersionUID = 1L;
/** The {@link org.apache.commons.scxml2.Context} for the current state. */
private final Context leaf;
/** Constructor. */
public EffectiveContextMap(final Context ctx) {
super();
this.leaf = ctx;
}
/**
* {@inheritDoc}
*/
@Override
public Set<Entry<String, Object>> entrySet() {
Set<Entry<String, Object>> entrySet = new HashSet<Entry<String, Object>>();
Context current = leaf;
while (current != null) {
entrySet.addAll(current.getVars().entrySet());
current = current.getParent();
}
return entrySet;
}
/**
* {@inheritDoc}
*/
@Override
public Object put(final String key, final Object value) {
Object old = leaf.get(key);
if (leaf.has(key)) {
leaf.set(key, value);
} else {
leaf.setLocal(key, value);
}
return old;
}
/**
* {@inheritDoc}
*/
@Override
public Object get(final Object key) {
if (key != null) {
Context current = leaf;
while (current != null) {
if (current.getVars().containsKey(key.toString())) {
return current.getVars().get(key);
}
current = current.getParent();
}
}
return null;
}
}