suneido.database.query.History.java Source code

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Here is the source code for suneido.database.query.History.java

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/* Copyright 2008 (c) Suneido Software Corp. All rights reserved.
 * Licensed under GPLv2.
 */

package suneido.database.query;

import java.util.List;
import java.util.Set;

import com.google.common.collect.ImmutableList;

import suneido.database.immudb.Dbpkg;
import suneido.database.immudb.HistoryIterator;
import suneido.database.immudb.Record;
import suneido.database.immudb.Transaction;

public class History extends Query {
    private final String tablename;
    private final suneido.database.immudb.Table tbl;
    private List<String> columns = null;
    private Header header = null;
    private List<List<String>> indexes;
    private List<List<String>> keys;
    private final HistoryIterator iter;

    History(Transaction tran, String tablename) {
        this.tablename = tablename;
        tbl = tran.ck_getTable(tablename);
        iter = tran.historyIterator(tbl.num());
    }

    @Override
    public String toString() {
        return "history(" + tablename + ")";
    }

    @Override
    List<String> columns() {
        if (columns == null)
            columns = new ImmutableList.Builder<String>().addAll(tbl.getColumns()).add("_action").add("_date")
                    .build();
        return columns;
    }

    @Override
    int columnsize() {
        return 10;
    }

    @Override
    public Header header() {
        if (header == null)
            header = new Header(
                    ImmutableList.of(noFields, ImmutableList.of("_date", "_action"), noFields, tbl.getFields()),
                    columns());
        return header;
    }

    @Override
    boolean singleDbTable() {
        return false;
    }

    @Override
    List<List<String>> indexes() {
        if (indexes == null)
            indexes = ImmutableList.of(ImmutableList.of("_date"));
        return indexes;
    }

    @Override
    public List<List<String>> keys() {
        if (keys == null)
            keys = ImmutableList.of(ImmutableList.of("_date"));
        return keys;
    }

    @Override
    double nrecords() {
        return 1000;
    }

    @Override
    double optimize2(List<String> index, Set<String> needs, Set<String> firstneeds, boolean is_cursor,
            boolean freeze) {
        return 100000;
    }

    @Override
    int recordsize() {
        return 100;
    }

    @Override
    public void rewind() {
        iter.rewind();
    }

    @Override
    void select(List<String> index, Record from, Record to) {
        iter.rewind();
    }

    @Override
    public void setTransaction(Transaction tran) {
    }

    @Override
    public Row get(Dir dir) {
        Record[] data = (dir == Dir.NEXT) ? iter.getNext() : iter.getPrev();
        if (data == null)
            return null;
        return new Row(Dbpkg.MIN_RECORD, data[0], Dbpkg.MIN_RECORD, data[1]);
    }

    @Override
    public void close() {
    }

}