All Downloads are FREE. Search and download functionalities are using the official Maven repository.
  • Log In
  • Register

    • org.directwebremoting.json.JsonUtil Maven / Gradle / Ivy

    Go to download

    DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

    The newest version!
    package org.directwebremoting.json;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.List;
import java.util.Map;

import org.directwebremoting.json.parse.JsonParseException;
import org.directwebremoting.json.parse.JsonParser;
import org.directwebremoting.json.parse.JsonParserFactory;
import org.directwebremoting.json.parse.impl.IgnoreJsonDecoder;
import org.directwebremoting.json.parse.impl.ReflectionJsonDecoder;
import org.directwebremoting.json.parse.impl.SimpleJsonDecoder;
import org.directwebremoting.json.serialize.JsonSerializer;
import org.directwebremoting.json.serialize.JsonSerializerFactory;

/**
 * Various utilities to make parsing and reading JSON easier
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class JsonUtil
{
    /**
     * Get a record of any errors in parsing the input string
     * @param input ...
     * @return ...
     */
    public static String getErrors(String input)
    {
        return getErrors(new StringReader(input));
    }

    /**
     * Get a record of any errors in parsing the input document
     * @param reader ...
     * @return ...
     */
    public static String getErrors(Reader reader)
    {
        try
        {
            JsonParser parser = JsonParserFactory.get();
            parser.parse(reader, new IgnoreJsonDecoder());
            return null;
        }
        catch (JsonParseException ex)
        {
            return ex.toString();
        }
    }

    /**
     * Convert the input string into a set of basic types
     * @param input ...
     * @return ...
     * @throws JsonParseException ...
     */
    public static Map toSimpleObject(String input) throws JsonParseException
    {
        return toSimpleObject(new StringReader(input));
    }

    /**
     * Convert the input document into a set of basic types
     * @param reader ...
     * @return ...
     * @throws JsonParseException ...
     */
    @SuppressWarnings("unchecked")
    public static Map toSimpleObject(Reader reader) throws JsonParseException
    {
        JsonParser parser = JsonParserFactory.get();
        return (Map) parser.parse(reader, new SimpleJsonDecoder());
    }

    /**
     * Convert the input string into a set of basic types
     * @param input ...
     * @return ...
     * @throws JsonParseException ...
     */
    public static List toSimpleArray(String input) throws JsonParseException
    {
        return toSimpleArray(new StringReader(input));
    }

    /**
     * Convert the input document into a set of basic types
     * @param reader ...
     * @return ...
     * @throws JsonParseException ...
     */
    @SuppressWarnings("unchecked")
    public static List toSimpleArray(Reader reader) throws JsonParseException
    {
        JsonParser parser = JsonParserFactory.get();
        return (List) parser.parse(reader, new SimpleJsonDecoder());
    }

    /**
     * Convert the input string into a set of basic types
     * @param  ...
     * @param marshallInto ...
     * @param input ...
     * @return ...
     * @throws JsonParseException ...
     */
    public static  T toReflectedTypes(Class marshallInto, String input) throws JsonParseException
    {
        return toReflectedTypes(marshallInto, new StringReader(input));
    }

    /**
     * Convert the input document into a set of basic types
     * @param  ...
     * @param marshallInto ...
     * @param reader ...
     * @return ...
     * @throws JsonParseException ...
     */
    @SuppressWarnings("unchecked")
    public static  T toReflectedTypes(Class marshallInto, Reader reader) throws JsonParseException
    {
        JsonParser parser = JsonParserFactory.get();
        return (T) parser.parse(reader, new ReflectionJsonDecoder(marshallInto));
    }

    /**
     * Convert arbitrary convertible data into a JSON string and write it out
     * to the given Writer
     * @param data ...
     * @param out ...
     * @throws IOException ...
     */
    public static void toJson(Object data, Writer out) throws IOException
    {
        JsonSerializer serializer = JsonSerializerFactory.get();
        serializer.toJson(data, out);
    }

    /**
     * Convert arbitrary convertible data into a JSON string.
     * @param data ...
     * @return ...
     * @throws IOException ...
     */
    public static String toJson(Object data) throws IOException
    {
        StringWriter out = new StringWriter();
        toJson(data, out);
        return out.toString();
    }

    /*
     * Convert the set of {@link InboundVariable}s to JSON
     * @return This object in JSON
     * @throws InvalidJsonException If this can't be represented as JSON
     *
    public JsonValue getJsonValue(OnJsonParseError onError) throws InvalidJsonException
    {
        return getJsonValue(onError, 0);
    }

    /*
     * Convert the set of {@link InboundVariable}s to JSON
     * @return This object in JSON
     * @throws InvalidJsonException If this can't be represented as JSON
     *
    private JsonValue getJsonValue(OnJsonParseError onError, int currentDepth) throws InvalidJsonException
    {
        if (currentDepth > 50)
        {
            throw new InvalidJsonException("JSON structure too deeply nested. Is it recursive?");
        }

        String value = getValue();

        if ("boolean".equalsIgnoreCase(type))
        {
            return new JsonBoolean(Boolean.parseBoolean(value));
        }
        else if ("number".equalsIgnoreCase(type))
        {
            return new JsonNumber(Double.parseDouble(value));
        }
        else if ("string".equalsIgnoreCase(type))
        {
            return new JsonString(value);
        }
        else if ("date".equalsIgnoreCase(type))
        {
            switch (onError)
            {
            case Throw:
                throw new InvalidJsonException("Can't use date in JSON");
            case Skip:
                return new JsonNull();
            }
        }
        else if ("xml".equalsIgnoreCase(type))
        {
            switch (onError)
            {
            case Throw:
                throw new InvalidJsonException("Can't use XML in JSON");
            case Skip:
                return new JsonNull();
            }
        }
        else if ("array".equalsIgnoreCase(type))
        {
            JsonArray array = new JsonArray();

            // If the text is null then the whole bean is null
            if (value.trim().equals(ProtocolConstants.INBOUND_NULL))
            {
                return new JsonNull();
            }

            if (!value.startsWith(ProtocolConstants.INBOUND_ARRAY_START) || !value.endsWith(ProtocolConstants.INBOUND_ARRAY_END))
            {
                log.warn("Expected collection. Passed: " + value);
                throw new InvalidJsonException("Data conversion error. See logs for more details.");
            }

            value = value.substring(1, value.length() - 1);
            StringTokenizer st = new StringTokenizer(value, ProtocolConstants.INBOUND_ARRAY_SEPARATOR);
            int size = st.countTokens();
            for (int i = 0; i < size; i++)
            {
                String token = st.nextToken();

                String[] split = ConvertUtil.splitInbound(token);
                String splitValue = split[ConvertUtil.INBOUND_INDEX_VALUE];

                InboundVariable nested = context.getInboundVariable(splitValue);
                array.add(nested.getJsonValue(onError, currentDepth + 1));
            }

            return array;
        }
        else if (type.startsWith("Object_"))
        {
            JsonObject object = new JsonObject();

            // If the text is null then the whole bean is null
            if (value.trim().equals(ProtocolConstants.INBOUND_NULL))
            {
                return new JsonNull();
            }

            if (!value.startsWith(ProtocolConstants.INBOUND_MAP_START) || !value.endsWith(ProtocolConstants.INBOUND_MAP_END))
            {
                log.warn("Expected object. Passed: " + value);
                throw new InvalidJsonException("Data conversion error. See logs for more details.");
            }

            value = value.substring(1, value.length() - 1);

            // Loop through the property declarations
            StringTokenizer st = new StringTokenizer(value, ",");
            int size = st.countTokens();
            for (int i = 0; i < size; i++)
            {
                String token = st.nextToken();
                if (token.trim().length() == 0)
                {
                    continue;
                }

                int colonpos = token.indexOf(ProtocolConstants.INBOUND_MAP_ENTRY);
                if (colonpos == -1)
                {
                    throw new InvalidJsonException("Missing separator: " + ProtocolConstants.INBOUND_MAP_ENTRY);
                }

                // Convert the value part of the token by splitting it into the
                // type and value (as passed in by Javascript)
                String valStr = token.substring(colonpos + 1).trim();
                String[] splitIv = ConvertUtil.splitInbound(valStr);
                String splitIvValue = splitIv[ConvertUtil.INBOUND_INDEX_VALUE];

                String keyStr = token.substring(0, colonpos).trim();

                InboundVariable nested = context.getInboundVariable(splitIvValue);
                object.put(keyStr, nested.getJsonValue(onError, currentDepth + 1));
            }

            return object;
        }

        log.warn("Data type: " + type + " is not one that InboundVariable understands");
        throw new InvalidJsonException("Unknown data type");
    }
    */
}
    
    
    
    

    




    
    
    © 2015 - 2025 Weber Informatics LLC | Privacy Policy