/**
* Copyright (C) 2012-2017 52°North Initiative for Geospatial Open Source
* Software GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* If the program is linked with libraries which are licensed under one of
* the following licenses, the combination of the program with the linked
* library is not considered a "derivative work" of the program:
*
* - Apache License, version 2.0
* - Apache Software License, version 1.0
* - GNU Lesser General Public License, version 3
* - Mozilla Public License, versions 1.0, 1.1 and 2.0
* - Common Development and Distribution License (CDDL), version 1.0
*
* Therefore the distribution of the program linked with libraries licensed
* under the aforementioned licenses, is permitted by the copyright holders
* if the distribution is compliant with both the GNU General Public
* License version 2 and the aforementioned licenses.
*
* This program 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 General
* Public License for more details.
*/
package org.n52.sos.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URL;
import java.util.Collection;
import java.util.Map;
import java.util.logging.Level;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.fasterxml.jackson.core.util.DefaultPrettyPrinter;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectReader;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.Maps;
import com.google.common.io.Closeables;
/**
* TODO JavaDoc
*
* @author Christian Autermann <c.autermann@52north.org>
*
* @since 4.2.0
*/
public class JSONUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(JSONUtils.class);
private static final JsonNodeFactory FACTORY = JsonNodeFactory.withExactBigDecimals(false);
private static final ObjectReader READER;
private static final ObjectWriter WRITER;
private static final Function<Object, JsonNode> TO_JSON_STRING
= new Function<Object, JsonNode>() {
@Override
public JsonNode apply(Object object) {
if (object == null) {
return nodeFactory().nullNode();
} else if (object instanceof JsonNode) {
return (JsonNode) object;
} else {
return nodeFactory().textNode(String.valueOf(object));
}
}
};
static {
final ObjectMapper mapper =
new ObjectMapper().setNodeFactory(FACTORY).enable(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS);
READER = mapper.reader();
DefaultPrettyPrinter pp = new DefaultPrettyPrinter();
pp.indentArraysWith(DefaultPrettyPrinter.Lf2SpacesIndenter.instance);
WRITER = mapper.writer(pp);
}
protected JSONUtils() {
}
public static ObjectReader getReader() {
return READER;
}
public static ObjectWriter getWriter() {
return WRITER;
}
public static JsonNodeFactory nodeFactory() {
return FACTORY;
}
public static String print(final JsonNode node) {
final StringWriter writer = new StringWriter();
try {
print(writer, node);
writer.flush();
} catch (IOException e) {
// cannot happen
} finally {
try {
Closeables.close(writer, true);
} catch (IOException ioe) {
LOGGER.error("Error while colsing closeable!", ioe);
}
}
return writer.toString();
}
public static void print(final Writer writer, final JsonNode node) throws IOException {
getWriter().writeValue(writer, node);
}
public static void print(final OutputStream writer, final JsonNode node) throws IOException {
getWriter().writeValue(writer, node);
}
public static JsonNode loadURL(final URL url) throws IOException {
return getReader().readTree(url.openStream());
}
public static JsonNode loadPath(final String path) throws IOException {
final JsonNode ret;
final FileInputStream in = new FileInputStream(path);
try {
ret = getReader().readTree(in);
} finally {
in.close();
}
return ret;
}
public static JsonNode loadFile(final File file) throws IOException {
final JsonNode ret;
final FileInputStream in = new FileInputStream(file);
try {
ret = getReader().readTree(in);
} finally {
in.close();
}
return ret;
}
public static JsonNode loadStream(final InputStream in) throws IOException {
return getReader().readTree(in);
}
public static JsonNode loadReader(final Reader reader) throws IOException {
return getReader().readTree(reader);
}
public static JsonNode loadString(final String json) {
try {
return loadReader(new StringReader(json));
} catch (IOException ex) {
// cannot happen
throw new RuntimeException(ex);
}
}
public static ObjectNode toJSON(Map<String, ?> map) {
ObjectNode node = nodeFactory().objectNode();
if (map != null) {
node.putAll(Maps.transformValues(map, TO_JSON_STRING));
}
return node;
}
public static ArrayNode toJSON(Collection<?> coll) {
ArrayNode node = nodeFactory().arrayNode();
node.addAll(Collections2.transform(coll, TO_JSON_STRING));
return node;
}
}