/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright © 2012 ForgeRock AS. All rights reserved.
 *
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the License). You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the License at
 * http://forgerock.org/license/CDDLv1.0.html
 * See the License for the specific language governing
 * permission and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL
 * Header Notice in each file and include the License file
 * at http://forgerock.org/license/CDDLv1.0.html
 * If applicable, add the following below the CDDL Header,
 * with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 */
package org.forgerock.openidm.workflow.activiti.impl;

import org.activiti.engine.impl.variable.ValueFields;
import org.activiti.engine.impl.variable.VariableType;
import org.codehaus.jackson.map.ObjectMapper;
import org.forgerock.json.fluent.JsonValue;

import java.io.IOException;
import java.io.StringWriter;

/**
 * @author $author$
 * @version $Revision$ $Date$
 */
public class JsonValueType implements VariableType {

    private static final ObjectMapper mapper = new ObjectMapper();

    public String getTypeName() {
        return "jsonvalue";
    }

    public boolean isCachable() {
        return true;
    }

    public Object getValue(ValueFields valueFields) {
        try {
            return mapper.readValue(valueFields.getTextValue(), Object.class);
        } catch (IOException e) {
            return null;
        }
    }

    public void setValue(Object value, ValueFields valueFields) {
        try {
            StringWriter writer = new StringWriter();
            mapper.writeValue(writer, value);
            valueFields.setTextValue(writer.toString());
        } catch (IOException e) {
            valueFields.setTextValue("null");
        }
    }

    public boolean isAbleToStore(Object value) {
        if (value == null) {
            return true;
        }
        return JsonValue.class.isAssignableFrom(value.getClass());
    }
}