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/**
* Module : Rule.java Copyright : (c) 2011-2012, Galois, Inc.
*
* Maintainer : Stability : Provisional Portability: Portable
*
* 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 com.galois.fiveui;
import java.text.ParseException;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.NativeObject;
import org.mozilla.javascript.Scriptable;
import com.google.gson.Gson;
public class Rule {
/**
* Parse a string representation of a Rule into a Java POJO.
*
* @param str string representing a rule set
* @return a RuleSet object
* @throws ParseException
*/
public static final Rule parse(String str) throws ParseException {
Context cx = Context.enter();
try {
Scriptable scope = cx.initStandardObjects();
cx.evaluateString(scope, "exports = {};"+str, "<rule>", 1, null);
Object mExports = scope.get("exports", scope);
if (mExports == Scriptable.NOT_FOUND) {
throw new ParseException("Could not parse rule: no Exports found", 0);
} else {
NativeObject exports = (NativeObject)mExports;
String name = "";
String description = "";
Object rule;
String ruleStr = "";
if (exports.containsKey("name") ) {
name = exports.get("name").toString();
}
if (exports.containsKey("description") ) {
description = exports.get("description").toString();
}
if (exports.containsKey("rule") ) {
rule = exports.get("rule");
ruleStr = Context.toString(rule);
}
return new Rule(name, description, ruleStr);
}
} finally {
Context.exit();
}
}
private final String _name;
private final String _desc;
private final String _rule;
public Rule(final String name, final String desc, final String rule) {
this._name = name;
this._desc = desc;
this._rule = rule;
}
public String getName() {
return _name;
}
public String getDescription() {
return _desc;
}
public String getRule() {
return _rule;
}
@Override
public String toString() {
Gson gson = new Gson();
String ruleStr = getRule().replace("\"", "\\\"");
return "exports.name = " + gson.toJson(getName()) + ";\n" +
"exports.description = " + gson.toJson(getDescription()) + ";\n" +
"exports.rule = \"" + ruleStr + "\";\n";
}
/**
* Equals and hashCode ignore the rule function text when performing comparisons.
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((_desc == null) ? 0 : _desc.hashCode());
result = prime * result + ((_name == null) ? 0 : _name.hashCode());
return result;
}
/**
* Equals and hashCode ignore the rule function text when performing comparisons.
*/
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Rule other = (Rule) obj;
if (_desc == null) {
if (other._desc != null)
return false;
} else if (!_desc.equals(other._desc))
return false;
if (_name == null) {
if (other._name != null)
return false;
} else if (!_name.equals(other._name))
return false;
return true;
}
}
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