Example usage for org.json.simple.parser JSONParser parse

Introduction

In this page you can find the example usage for org.json.simple.parser JSONParser parse.

Prototype

public void parse(Reader in, ContentHandler contentHandler, boolean isResume)
        throws IOException, ParseException 

Source Link

Document

Stream processing of JSON text.

Usage

From source file:com.dynamobi.db.conn.couchdb.CouchUdx.java

/**
 * Called by a custom LucidDB function for each view.
 * @param userName - CouchDB user name//w  ww .  j a  va2s  . c om
 * @param pw - CouchDB password
 * @param url - CouchDB REST URL
 * @param view - CouchDB REST view -- concatenated on the end of URL with
 *               a slash prefix if necessary.
 * @param limit - Limit parameter passed to couchdb
 * @param reduce - if false, we pass &reduce=false to the view.
 * @param groupLevel - sent to view for group reduction, default 'EXACT'
 * Possible values: 'EXACT', sends &group=true.
 * 'NONE': sends &group=false.
 * 1-N: sends &group_level=x to the view or summarizer. 1 says to group
 * on the first index of the array key, 2 says the first two indexes,
 * N all indexes (equivalent to 'EXACT').
 *
 * (the following should be done in logic rewrite rule?) TODO:
 * 'CALCULATE': typically set by the pushdown optimizer, instructs
 * this udx to best-guess what group level we can/should push down.
 * The basic idea is that if the columns in a GROUP BY statement belong
 * to objects defined as elements of the key array for the first key-value
 * pair returned by a view, we will push down the number of columns being
 * grouped by and ignore the grouping on the LucidDB end. Otherwise all
 * group by's will still be done by LucidDB.
 * @param resultInserter - Table for inserting results. Assumed to have the
 * necessary column names in the order we get them.
 */
public static void query(String userName, String pw, String url, String view, String limit, boolean reduce,
        String groupLevel, boolean outputJson, PreparedStatement resultInserter) throws SQLException {

    // Specialize so we can column names for our resultInserter
    // instead of assuming an order.
    ParameterMetaData pmd = resultInserter.getParameterMetaData();
    FarragoParameterMetaData fpmd = (FarragoParameterMetaData) pmd;
    int paramCount = fpmd.getParameterCount();
    String[] paramNames = new String[paramCount];
    for (int i = 0; i < paramCount; i++) {
        paramNames[i] = fpmd.getFieldName(i + 1); // JDBC offset
    }

    RowProducer producer = new RowProducer();
    JSONParser parser = new JSONParser();

    InputStreamReader in = getViewStream(userName, pw, url, view, limit, reduce, groupLevel, true);

    while (!producer.isDone()) {
        try {
            parser.parse(in, producer, true);
        } catch (Throwable e) { // IOException, ParseException
            throw new SQLException(e);
        }

        if (!producer.getKey().equals("key"))
            continue;
        Object key = producer.getValue();

        try {
            parser.parse(in, producer, true);
        } catch (Throwable e) { // IOException, ParseException
            throw new SQLException(e);
        }

        assert (producer.getKey().equals("value"));
        Object value = producer.getValue();

        if (outputJson) {
            // put key in first col, val in second col, escape.
            resultInserter.setString(1, key.toString());
            resultInserter.setString(2, value.toString());
            resultInserter.executeUpdate();
            continue;
        }

        Map<String, Object> params = new HashMap<String, Object>(paramNames.length);
        int dupes = mergeParams(params, key, "KEY");
        dupes += mergeParams(params, value, "VALUE");

        if (params.size() - dupes != paramNames.length) {
            // We have more params than columns..
            throw new SQLException("Read " + params.size() + " params and " + paramNames.length
                    + " columns, which need to match. Did you " + "add column(s) for both the key and value?");
        }

        for (int c = 0; c < paramNames.length; c++) {
            Object o = params.get(paramNames[c]);
            if (o != null) {
                resultInserter.setObject(c + 1, o);
            }
        }

        resultInserter.executeUpdate();
    }
}

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