com.foobar.store.FromJSONSeqConverter.java Source code

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Here is the source code for com.foobar.store.FromJSONSeqConverter.java

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/*
 * Copyright (C) IBM Corp. 2008.
 * 
 * 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.foobar.store;

import java.io.ByteArrayInputStream;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;

import com.ibm.jaql.io.converter.ToJson;
import com.ibm.jaql.io.hadoop.converter.HadoopRecordToJson;
import com.ibm.jaql.json.parser.JsonParser;
import com.ibm.jaql.json.schema.Schema;
import com.ibm.jaql.json.schema.SchemaFactory;
import com.ibm.jaql.json.type.JsonValue;

/**
 * 
 */
public class FromJSONSeqConverter extends HadoopRecordToJson<WritableComparable<?>, Writable> {

    /**
     * @param w
     * @param i
     */
    private JsonValue convertWritableToItem(Writable w, JsonValue val) {
        if (w == null)
            return null;
        Text t = null;
        if (w instanceof Text) {
            t = (Text) w;
        } else {
            t = new Text(w.toString());
        }

        ByteArrayInputStream input = new ByteArrayInputStream(t.getBytes());
        JsonParser parser = new JsonParser(input);

        try {
            val = parser.JsonVal();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return val;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.ibm.jaql.io.hadoop.converter.HadoopRecordToItem#createKeyConverter()
     */
    @Override
    protected ToJson<WritableComparable<?>> createKeyConverter() {
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.ibm.jaql.io.hadoop.converter.HadoopRecordToItem#createValConverter()
     */
    @Override
    protected ToJson<Writable> createValueConverter() {
        return new ToJson<Writable>() {

            public JsonValue convert(Writable src, JsonValue tgt) {
                return convertWritableToItem(src, tgt);
            }

            public JsonValue createTarget() {
                return null;
            }

            public Schema getSchema() {
                return SchemaFactory.anySchema();
            }
        };
    }

}