io.konig.runtime.io.BaseJsonReader.java Source code

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Here is the source code for io.konig.runtime.io.BaseJsonReader.java

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package io.konig.runtime.io;

/*
 * #%L
 * Konig Java
 * %%
 * Copyright (C) 2015 - 2017 Gregory McFall
 * %%
 * 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.
 * #L%
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.GregorianCalendar;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;

public abstract class BaseJsonReader<T> implements JsonReader<T> {

    public BaseJsonReader() {
    }

    @Override
    public T read(Reader writer) throws ValidationException, IOException {
        JsonFactory factory = new JsonFactory();
        JsonParser parser = factory.createParser(writer);
        return read(parser);

    }

    @Override
    public T read(InputStream in) throws ValidationException, IOException {

        JsonFactory factory = new JsonFactory();
        JsonParser parser = factory.createParser(in);
        return read(parser);

    }

    protected void skipField(JsonParser parser) throws IOException {

        switch (parser.nextToken()) {
        case START_OBJECT:
            skipObject(parser);
            break;

        case START_ARRAY:
            skipArray(parser);
            break;

        default: // Do nothing
        }
    }

    private void skipArray(JsonParser parser) throws JsonParseException, IOException {

        while (!parser.isClosed() && parser.nextToken() != JsonToken.END_ARRAY) {
            switch (parser.getCurrentToken()) {
            case START_OBJECT:
                skipObject(parser);
                break;

            case START_ARRAY:
                skipArray(parser);
                break;

            default: // Do nothing
            }

        }

    }

    private void skipObject(JsonParser parser) throws JsonParseException, IOException {

        while (!parser.isClosed() && parser.nextToken() == JsonToken.FIELD_NAME) {

            switch (parser.nextToken()) {
            case START_OBJECT:
                skipObject(parser);
                break;

            case START_ARRAY:
                skipArray(parser);
                break;

            default: // Do nothing
            }
        }

    }

    protected void assertStartArray(JsonParser parser) throws IOException {
        if (parser.getCurrentToken() != JsonToken.START_ARRAY) {
            throw new JsonParseException("Expected an array", parser.getTokenLocation());
        }
    }

    protected GregorianCalendar dateTime(JsonParser parser) throws IOException {
        DateTimeFormatter fmt = ISODateTimeFormat.dateOptionalTimeParser();
        String text = parser.getValueAsString();
        DateTime joda = fmt.parseDateTime(text);
        return joda.toGregorianCalendar();
    }

}