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package org.apache.wink.common.model.csv;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

/**
 * Represents a multiple table CSV. Contains multiple (separate) tables that
 * make up a single CSV. The rows of the tables may be of different lengths. An
 * empty line is used to separate the tables when serializing or deserializing.
 */
public class MultiCsvTable implements CsvSerializer, CsvDeserializer {

    private final static String[] EMPTY_ARRAY = new String[] {};
    private List        tablesList;
    private boolean               needNewTable;

    public MultiCsvTable() {
        tablesList = new LinkedList();
        needNewTable = true;
    }

    /**
     * Create a new CsvTable with the specified header, and add it to this
     * multi-table csv
     * 
     * @param header the header of the new table (can be empty).
     * @return the created table
     */
    public CsvTable createCsvTable(String... header) {
        CsvTable table = new CsvTable(header);
        addTable(table);
        return table;
    }

    /**
     * Add a table to this multi-table csv. This is a shortcut for
     * getTables().add(table)
     * 
     * @param table the table to add
     */
    public void addTable(CsvTable table) {
        tablesList.add(table);
    }

    /**
     * Get the live list of tables contained in this multi-table csv
     * 
     * @return the live list of tables contained in this multi-table csv
     */
    public List getTables() {
        return tablesList;
    }

    public Iterator getEntities() {
        return new TablesIterator(tablesList.iterator());
    }

    /**
     * Add a row to the last table when deserializing a multi table csv.
     * 

* If no table exists, or the length of the row is 0, or the row has only * one element and it is null or an empty string, then a new table is * created instead of adding the row to the last table. */ public void addEntity(String[] row) { if (row == null) { return; } if (isTableSeparator(row)) { needNewTable = true; return; } if (needNewTable) { createCsvTable(); needNewTable = false; } CsvTable table = tablesList.get(tablesList.size() - 1); table.addRow(row); } private boolean isTableSeparator(String[] row) { if (row.length == 0) { return true; } if (row.length == 1) { if (row[0] == null || row[0].length() == 0) { return true; } } return false; } /** * iterator over the tables */ private class TablesIterator implements Iterator { private Iterator tableIterator; private Iterator rowIterator; public TablesIterator(Iterator itr) { tableIterator = itr; rowIterator = itr.next().getEntities(); } public boolean hasNext() { return rowIterator.hasNext() || tableIterator.hasNext(); } public String[] next() { if (!rowIterator.hasNext()) { rowIterator = tableIterator.next().getEntities(); // add blank lines between tables return EMPTY_ARRAY; } return rowIterator.next(); } public void remove() { throw new UnsupportedOperationException(); } } }





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