gov.nasa.jpf.jdart.summaries.json.ExpressionHandler.java Source code

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Here is the source code for gov.nasa.jpf.jdart.summaries.json.ExpressionHandler.java

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/*
 * Copyright (C) 2015, United States Government, as represented by the 
 * Administrator of the National Aeronautics and Space Administration.
 * All rights reserved.
 * 
 * The PSYCO: A Predicate-based Symbolic Compositional Reasoning environment 
 * platform is 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 gov.nasa.jpf.jdart.summaries.json;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import gov.nasa.jpf.constraints.api.Expression;
import gov.nasa.jpf.constraints.api.Variable;
import gov.nasa.jpf.constraints.parser.ParserUtil;
import gov.nasa.jpf.constraints.util.ExpressionUtil;
import gov.nasa.jpf.constraints.util.TypeUtil;
import java.lang.reflect.Type;
import org.antlr.runtime.RecognitionException;

/**
 *
 */
public class ExpressionHandler implements JsonSerializer<Expression<?>>, JsonDeserializer<Expression<?>> {

    @Override
    public JsonElement serialize(Expression t, Type type, JsonSerializationContext jsc) {
        if (t instanceof Variable) {
            Variable v = (Variable) t;
            return new JsonPrimitive("[V]" + v.toString(Variable.INCLUDE_VARIABLE_TYPE));
        } else if (!TypeUtil.isBoolSort(t)) {
            return new JsonPrimitive("[A]" + ExpressionUtil.toParseableString(t));

        }
        return new JsonPrimitive("[L]" + ExpressionUtil.toParseableString(t));
    }

    @Override
    public Expression<?> deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
            throws JsonParseException {
        try {
            String s = je.getAsJsonPrimitive().getAsString();
            if (s.startsWith("[V]")) {
                return ParserUtil.parseVariable(s.substring(3));
            } else if (s.startsWith("[A]")) {
                return ParserUtil.parseArithmetic(s.substring(3));
            }
            return ParserUtil.parseLogical(s.substring(3));
        } catch (RecognitionException ex) {
            throw new JsonParseException(ex);
        }
    }
}