org.structr.web.function.FromJsonFunction.java Source code

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Here is the source code for org.structr.web.function.FromJsonFunction.java

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/**
 * Copyright (C) 2010-2016 Structr GmbH
 *
 * This file is part of Structr <http://structr.org>.
 *
 * Structr is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * Structr is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Structr.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.structr.web.function;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import org.structr.core.GraphObject;
import org.structr.core.GraphObjectMap;
import org.structr.schema.action.ActionContext;

/**
 *
 */
public class FromJsonFunction extends UiFunction {

    public static final String ERROR_MESSAGE_FROM_JSON = "Usage: ${from_json(src)}. Example: ${from_json('{name:test}')}";
    public static final String ERROR_MESSAGE_FROM_JSON_JS = "Usage: ${{Structr.from_json(src)}}. Example: ${{Structr.from_json('{name:test}')}}";

    @Override
    public String getName() {
        return "from_json()";
    }

    @Override
    public Object apply(ActionContext ctx, final GraphObject entity, final Object[] sources) {

        if (sources != null && sources.length > 0) {

            if (sources[0] == null) {
                return "";
            }

            try {

                final String source = sources[0].toString();
                final Gson gson = new GsonBuilder().create();
                List<Map<String, Object>> objects = new LinkedList<>();

                if (StringUtils.startsWith(source, "[")) {

                    final List<Map<String, Object>> list = gson.fromJson(source,
                            new TypeToken<List<Map<String, Object>>>() {
                            }.getType());
                    final List<GraphObjectMap> elements = new LinkedList<>();

                    if (list != null) {

                        objects.addAll(list);
                    }

                    for (final Map<String, Object> src : objects) {

                        final GraphObjectMap destination = new GraphObjectMap();
                        elements.add(destination);

                        recursivelyConvertMapToGraphObjectMap(destination, src, 0);
                    }

                    return elements;

                } else if (StringUtils.startsWith(source, "{")) {

                    final Map<String, Object> value = gson.fromJson(source, new TypeToken<Map<String, Object>>() {
                    }.getType());
                    final GraphObjectMap destination = new GraphObjectMap();

                    if (value != null) {

                        recursivelyConvertMapToGraphObjectMap(destination, value, 0);
                    }

                    return destination;
                }

            } catch (Throwable t) {

                logException(entity, t, sources);

            }

            return "";

        } else {

            logParameterError(entity, sources, ctx.isJavaScriptContext());

        }

        return usage(ctx.isJavaScriptContext());
    }

    @Override
    public String usage(boolean inJavaScriptContext) {
        return (inJavaScriptContext ? ERROR_MESSAGE_FROM_JSON_JS : ERROR_MESSAGE_FROM_JSON);
    }

    @Override
    public String shortDescription() {
        return "Parses the given JSON string and returns an object";
    }

}