com.krobothsoftware.commons.parse.ParserJson.java Source code

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Here is the source code for com.krobothsoftware.commons.parse.ParserJson.java

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/* ===================================================
 * Copyright 2013 Kroboth Software
 *
 * 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 com.krobothsoftware.commons.parse;

import java.io.IOException;
import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.krobothsoftware.commons.util.CommonUtils;

/**
 * Json Parser part of <code>SNC-EXT-JSON</code> which parses
 * {@link HandlerJson} handlers. The Json library used to parse is Jackson JSON
 * Parse. Not to be confused with the class name <i>JsonParser</i>.
 * 
 * @author Kyle Kroboth
 * @since SNC-EXT-JSON 1.0
 */
public final class ParserJson implements ParserInitializable {
    private JsonFactory factory;
    private final Logger log;

    /**
     * Creates new Parser Json.
     * 
     * @since SNC-EXT-JSON 1.0
     */
    public ParserJson() {
        log = LoggerFactory.getLogger(ParserJson.class);
    }

    /**
     * Creates Json Factory. No throwables to worry about.
     * 
     * @since SNC-EXT-JSON 1.0
     */
    @Override
    public void init() {
        // no errors or exceptions to worry about
        factory = new JsonFactory();
    }

    /**
     * Gets Factory for json created inside the parser.
     * 
     * @return json factory or null if not initiated
     * @since SNC-EXT-JSON 1.0
     */
    public JsonFactory getFactory() {
        return factory;
    }

    /**
     * Parses Json Inputstream for handler. Stream is passed to Jackson parser
     * and should close after use.
     * 
     * @param inputStream
     * @param handler
     * @throws ParseException
     * @since SNC-EXT-JSON 1.0
     */
    @SuppressWarnings("resource")
    public void parse(InputStream inputStream, HandlerJson handler) throws ParseException {
        if (factory == null)
            factory = new JsonFactory();
        JsonParser parser = null;
        try {
            parser = factory.createParser(inputStream);
            handler.setLogger(log);
            handler.setJsonParser(parser);
            handler.parse();
        } catch (JsonParseException e) {
            throw new ParseException(e);
        } catch (IOException e) {
            throw new ParseException(e);
        } finally {
            CommonUtils.closeQuietly(parser);
        }
    }

    /**
     * Parses Json Inputstream from
     * {@link ParserHandler#parseHandler(InputStream, Handler, Handler, String) }
     * . Charset isn't used here because it isn't needed.
     * 
     * @param inputStream
     * @param handler
     *            raw handler
     * @param realHandler
     *            real handler
     * @throws ParseException
     * @since SNC-EXT-JSON 1.0
     */
    public void parse(InputStream inputStream, Handler handler, HandlerJson realHandler) throws ParseException {
        parse(inputStream, realHandler);
    }

}