org.ofbiz.entity.CsvEntityFileReader.java Source code

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Here is the source code for org.ofbiz.entity.CsvEntityFileReader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.ofbiz.entity;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.util.Map;

import javolution.util.FastMap;

import org.dom4j.Document;
import org.dom4j.DocumentFactory;
import org.dom4j.Element;

import au.com.bytecode.opencsv.CSVReader;

/**
 * Read entities from a CSV file
 * @author Liang Zhang
 */
public class CsvEntityFileReader implements EntityFileReader {

    private Document doc;
    private Element root;

    @Override
    public String getEntitiesInXml(File file) throws Exception {
        InputStream is = new FileInputStream(file);
        return this.getEntitiesInXml(is);
    }

    @Override
    public String getEntitiesInXml(ByteBuffer byteBuffer) throws Exception {
        byte[] inputByteArray = byteBuffer.array();
        InputStream is = new ByteArrayInputStream(inputByteArray);
        return this.getEntitiesInXml(is);
    }

    @Override
    public String getEntitiesInXml(InputStream is) throws Exception {
        CSVReader reader = new CSVReader(new InputStreamReader(is));
        String entityName = this.readEntityName(reader);

        Map<Integer, String> attrNameMap = this.readAttributeNames(reader);

        this.doc = DocumentFactory.getInstance().createDocument("UTF-8");
        this.root = this.doc.addElement("entity-engine-xml");

        String[] nextLine;
        String key;
        String value;
        while ((nextLine = reader.readNext()) != null) {
            int len = nextLine.length;
            Element entity = this.root.addElement(entityName);
            for (int i = 0; i < len; i++) {
                key = attrNameMap.get(i);
                value = nextLine[i];
                entity.addAttribute(key, value);
            }
        }

        return doc.asXML();
    }

    private String readEntityName(CSVReader reader) throws Exception {
        String[] line = reader.readNext();
        if (line == null || line.length == 0) {
            throw new Exception("The entity name in the first line cannot be null");
        }
        return line[0];
    }

    private Map<Integer, String> readAttributeNames(CSVReader reader) throws Exception {
        Map<Integer, String> map = FastMap.<Integer, String>newInstance();
        String[] line = reader.readNext();
        if (line == null || line.length == 0) {
            throw new Exception("The entity name in the first line cannot be null");
        }
        int len = line.length;
        for (int i = 0; i < len; i++) {
            map.put(i, line[i]);
        }
        return map;
    }

}