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org.mvel2.integration.impl.CachingMapVariableResolverFactory Maven / Gradle / Ivy
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TBEL is a powerful expression language for ThingsBoard platform user-defined functions.
Original implementation is based on MVEL.
/**
* MVEL 2.0
* Copyright (C) 2007 The Codehaus
* Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
*
* 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.mvel2.integration.impl;
import org.mvel2.UnresolveablePropertyException;
import org.mvel2.integration.VariableResolver;
import org.mvel2.integration.VariableResolverFactory;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
@SuppressWarnings({"unchecked"})
public class CachingMapVariableResolverFactory extends BaseVariableResolverFactory {
/**
* Holds the instance of the variables.
*/
protected Map variables;
public CachingMapVariableResolverFactory(Map variables) {
this.variables = variables;
}
public VariableResolver createVariable(String name, Object value) {
VariableResolver vr;
try {
(vr = getVariableResolver(name)).setValue(value);
return vr;
}
catch (UnresolveablePropertyException e) {
addResolver(name, vr = new SimpleSTValueResolver(value, null, true));
return vr;
}
}
public VariableResolver createVariable(String name, Object value, Class> type) {
VariableResolver vr;
try {
vr = getVariableResolver(name);
}
catch (UnresolveablePropertyException e) {
vr = null;
}
if (vr != null && vr.getType() != null) {
throw new RuntimeException("variable already defined within scope: " + vr.getType() + " " + name);
}
else {
addResolver(name, vr = new SimpleSTValueResolver(value, type, true));
return vr;
}
}
public VariableResolver getVariableResolver(String name) {
VariableResolver vr = variableResolvers.get(name);
if (vr != null) {
return vr;
}
else if (variables.containsKey(name)) {
variableResolvers.put(name, vr = new SimpleSTValueResolver(variables.get(name), null));
return vr;
}
else if (nextFactory != null) {
return nextFactory.getVariableResolver(name);
}
throw new UnresolveablePropertyException("unable to resolve variable '" + name + "'");
}
public boolean isResolveable(String name) {
return (variableResolvers.containsKey(name))
|| (variables != null && variables.containsKey(name))
|| (nextFactory != null && nextFactory.isResolveable(name));
}
protected VariableResolver addResolver(String name, VariableResolver vr) {
variableResolvers.put(name, vr);
return vr;
}
public void externalize() {
for (Map.Entry entry : variableResolvers.entrySet()) {
if (entry.getValue().getFlags() == -1) variables.put(entry.getKey(), entry.getValue().getValue());
}
}
public boolean isTarget(String name) {
return variableResolvers.containsKey(name);
}
public Set getKnownVariables() {
if (nextFactory == null) {
if (variables != null) return new HashSet(variables.keySet());
return new HashSet(0);
}
else {
if (variables != null) return new HashSet(variables.keySet());
return new HashSet(0);
}
}
public void clear() {
variableResolvers.clear();
variables.clear();
}
}
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