/* Licensed 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.activiti.engine.impl.scripting;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.script.Bindings;
import javax.script.SimpleScriptContext;
import org.activiti.engine.delegate.VariableScope;
/**
* @author Tom Baeyens
* @author Joram Barrez
*/
public class ScriptBindings implements Bindings {
/**
* The script engine implementations put some key/value pairs into the binding.
* This list contains those keys, such that they wouldn't be stored as process variable.
*
* This list contains the keywords for JUEL, Javascript and Groovy.
*/
protected static final Set<String> UNSTORED_KEYS =
new HashSet<String>(Arrays.asList("out", "out:print", "lang:import", "context", "elcontext", "print", "println"));
protected List<Resolver> scriptResolvers;
protected VariableScope variableScope;
protected Bindings defaultBindings;
protected boolean storeScriptVariables = true; // By default everything is stored (backwards compatibility)
public ScriptBindings(List<Resolver> scriptResolvers, VariableScope variableScope) {
this.scriptResolvers = scriptResolvers;
this.variableScope = variableScope;
this.defaultBindings = new SimpleScriptContext().getBindings(SimpleScriptContext.ENGINE_SCOPE);
}
public ScriptBindings(List<Resolver> scriptResolvers, VariableScope variableScope, boolean storeScriptVariables) {
this(scriptResolvers, variableScope);
this.storeScriptVariables = storeScriptVariables;
}
public boolean containsKey(Object key) {
for (Resolver scriptResolver: scriptResolvers) {
if (scriptResolver.containsKey(key)) {
return true;
}
}
return defaultBindings.containsKey(key);
}
public Object get(Object key) {
for (Resolver scriptResolver: scriptResolvers) {
if (scriptResolver.containsKey(key)) {
return scriptResolver.get(key);
}
}
return defaultBindings.get(key);
}
public Object put(String name, Object value) {
if (storeScriptVariables) {
Object oldValue = null;
if (!UNSTORED_KEYS.contains(name)) {
oldValue = variableScope.getVariable(name);
variableScope.setVariable(name, value);
return oldValue;
}
}
return defaultBindings.put(name, value);
}
public Set<Map.Entry<String, Object>> entrySet() {
return variableScope.getVariables().entrySet();
}
public Set<String> keySet() {
return variableScope.getVariables().keySet();
}
public int size() {
return variableScope.getVariables().size();
}
public Collection<Object> values() {
return variableScope.getVariables().values();
}
public void putAll(Map< ? extends String, ? extends Object> toMerge) {
throw new UnsupportedOperationException();
}
public Object remove(Object key) {
if (UNSTORED_KEYS.contains(key)) {
return null;
}
return defaultBindings.remove(key);
}
public void clear() {
throw new UnsupportedOperationException();
}
public boolean containsValue(Object value) {
throw new UnsupportedOperationException();
}
public boolean isEmpty() {
throw new UnsupportedOperationException();
}
}