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MapVariableResolverFactory.java
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MapVariableResolverFactory.java
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/**
* 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.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
@SuppressWarnings({"unchecked"})
public class MapVariableResolverFactory extends BaseVariableResolverFactory {
/**
* Holds the instance of the variables.
*/
protected Map<String, Object> variables;
public MapVariableResolverFactory() {
this.variables = new HashMap();
}
public MapVariableResolverFactory(Map variables) {
this.variables = variables;
}
public MapVariableResolverFactory(Map<String, Object> variables, VariableResolverFactory nextFactory) {
this.variables = variables;
this.nextFactory = nextFactory;
}
public MapVariableResolverFactory(Map<String, Object> variables, boolean cachingSafe) {
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 MapVariableResolver(variables, name)).setValue(value);
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 MapVariableResolver(variables, name, type)).setValue(value);
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 MapVariableResolver(variables, name));
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 boolean isTarget(String name) {
return variableResolvers.containsKey(name);
}
public Set<String> getKnownVariables() {
if (nextFactory == null) {
if (variables != null) return new HashSet<String>(variables.keySet());
return new HashSet<String>(0);
}
else {
if (variables != null) return new HashSet<String>(variables.keySet());
return new HashSet<String>(0);
}
}
public void clear() {
variableResolvers.clear();
variables.clear();
}
}