org.entrystore.ldcache.util.JsonUtil.java Source code

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Here is the source code for org.entrystore.ldcache.util.JsonUtil.java

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/*
 * Copyright (c) 2014 MetaSolutions AB <info@metasolutions.se>
 *
 * 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.entrystore.ldcache.util;

import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.openrdf.model.Value;
import org.openrdf.model.impl.URIImpl;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * @author Hannes Ebner
 */
public class JsonUtil {

    static Logger log = Logger.getLogger(JsonUtil.class);

    public static Set<Value> jsonArrayToValueSet(JSONArray array) {
        Set<Value> result = new HashSet<Value>();
        for (int i = 0; i < array.length(); i++) {
            String uri = null;
            try {
                uri = array.getString(i);
            } catch (JSONException e) {
                log.warn(e.getMessage());
                continue;
            }
            if (uri != null) {
                result.add(new URIImpl(NS.expandNS(uri)));
            }
        }
        return result;
    }

    public static Set<String> jsonArrayToStringSet(JSONArray array) {
        Set<String> result = new HashSet();
        for (int i = 0; i < array.length(); i++) {
            String uri = null;
            try {
                uri = array.getString(i);
            } catch (JSONException e) {
                log.warn(e.getMessage());
                continue;
            }
            if (uri != null) {
                result.add(NS.expandNS(uri));
            }
        }
        return result;
    }

    public static Map<Value, Value> jsonArrayToMap(JSONArray array) {
        Map<Value, Value> result = new HashMap<>();
        for (int i = 0; i < array.length(); i++) {
            try {
                JSONObject obj = array.getJSONObject(i);
                if (obj.keys().hasNext()) {
                    String key = (String) obj.keys().next();
                    String value = obj.getString(key);
                    if (key != null && value != null) {
                        result.put(new URIImpl(NS.expandNS(key)), new URIImpl(NS.expandNS(value)));
                    }
                }
            } catch (JSONException e) {
                log.warn(e.getMessage());
                continue;
            }
        }
        return result;
    }

    public static Map<Value, Value> jsonObjectToMap(JSONObject object) {
        Map<Value, Value> result = new HashMap<>();
        Iterator it = object.keys();
        while (it.hasNext()) {
            String key = (String) it.next();
            try {
                String value = object.getString(key);
                if (key != null && value != null) {
                    result.put(new URIImpl(NS.expandNS(key)), new URIImpl(NS.expandNS(value)));
                }
            } catch (JSONException e) {
                log.warn(e.getMessage());
                continue;
            }
        }
        return result;
    }

}