Examples of edu.luc.cs.laufer.cs473.index.Index

org.h2.index.Index
An index for a text document. For each word that occurs in the document, the index holds a list of line numbers where the word occurs. @author laufer

    }


    public void commit(short operation, Row row) {
        lastModificationId = database.getNextModificationDataId();
        for (int i = 0, size = indexes.size(); i < size; i++) {
            Index index = indexes.get(i);
            index.commit(operation, row);
        }
    }

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                    throw DbException.get(ErrorCode.COLUMN_MUST_NOT_BE_NULLABLE_1, column.getName());
                }
                column.setPrimaryKey(true);
            }
        }
        Index index;
        if (isPersistIndexes() && indexType.isPersistent()) {
            int mainIndexColumn;
            if (database.isStarting() && database.getPageStore().getRootPageId(indexId) != 0) {
                mainIndexColumn = -1;
            } else if (!database.isStarting() && mainIndex.getRowCount(session) != 0) {
                mainIndexColumn = -1;
            } else {
                mainIndexColumn = getMainIndexColumn(indexType, cols);
            }
            if (mainIndexColumn != -1) {
                mainIndex.setMainIndexColumn(mainIndexColumn);
                index = new PageDelegateIndex(this, indexId, indexName, indexType, mainIndex, create, session);
            } else {
                index = new PageBtreeIndex(this, indexId, indexName, cols, indexType, create, session);
            }
        } else {
            if (indexType.isHash() && cols.length <= 1) {
                if (indexType.isUnique()) {
                    index = new HashIndex(this, indexId, indexName, cols, indexType);
                } else {
                    index = new NonUniqueHashIndex(this, indexId, indexName, cols, indexType);
                }
            } else {
                index = new TreeIndex(this, indexId, indexName, cols, indexType);
            }
        }
        if (database.isMultiVersion()) {
            index = new MultiVersionIndex(index, this);
        }
        if (index.needRebuild() && rowCount > 0) {
            try {
                Index scan = getScanIndex(session);
                long remaining = scan.getRowCount(session);
                long total = remaining;
                Cursor cursor = scan.find(session, null, null);
                long i = 0;
                int bufferSize = (int) Math.min(rowCount, Constants.DEFAULT_MAX_MEMORY_ROWS);
                ArrayList<Row> buffer = New.arrayList(bufferSize);
                String n = getName() + ":" + index.getName();
                int t = MathUtils.convertLongToInt(total);

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    public boolean canGetRowCount() {
        return true;
    }


    private static void addRowsToIndex(Session session, ArrayList<Row> list, Index index) {
        final Index idx = index;
        Collections.sort(list, new Comparator<Row>() {
            public int compare(Row r1, Row r2) {
                return idx.compareRows(r1, r2);
            }
        });
        for (Row row : list) {
            index.add(session, row);
        }

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        }
        lastModificationId = database.getNextModificationDataId();
        int i = indexes.size() - 1;
        try {
            for (; i >= 0; i--) {
                Index index = indexes.get(i);
                index.remove(session, row);
                checkRowCount(session, index, -1);
            }
            rowCount--;
        } catch (Throwable e) {
            try {
                while (++i < indexes.size()) {
                    Index index = indexes.get(i);
                    index.add(session, row);
                    checkRowCount(session, index, 0);
                }
            } catch (DbException e2) {
                // this could happen, for example on failure in the storage
                // but if that is not the case it means there is something wrong

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    }


    public void truncate(Session session) {
        lastModificationId = database.getNextModificationDataId();
        for (int i = indexes.size() - 1; i >= 0; i--) {
            Index index = indexes.get(i);
            index.truncate(session);
        }
        rowCount = 0;
        changesSinceAnalyze = 0;
    }

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    public void removeChildrenAndResources(Session session) {
        super.removeChildrenAndResources(session);
        // go backwards because database.removeIndex will call table.removeIndex
        while (indexes.size() > 1) {
            Index index = indexes.get(1);
            if (index.getName() != null) {
                database.removeSchemaObject(session, index);
            }
        }
        if (SysProperties.CHECK) {
            for (SchemaObject obj : database.getAllSchemaObjects(DbObject.INDEX)) {
                Index index = (Index) obj;
                if (index.getTable() == this) {
                    DbException.throwInternalError("index not dropped: " + index.getName());
                }
            }
        }
        scanIndex.remove(session);
        database.removeMeta(session, getId());

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        }
        ArrayList<Index> indexesToDrop = New.arrayList();
        ArrayList<Index> indexes = getIndexes();
        if (indexes != null) {
            for (int i = 0, size = indexes.size(); i < size; i++) {
                Index index = indexes.get(i);
                if (index.getCreateSQL() == null) {
                    continue;
                }
                if (index.getColumnIndex(col) < 0) {
                    continue;
                }
                if (index.getColumns().length == 1) {
                    indexesToDrop.add(index);
                } else {
                    throw DbException.get(ErrorCode.COLUMN_IS_REFERENCED_1, index.getSQL());
                }
            }
        }
        for (Constraint c : constraintsToDrop) {
            session.getDatabase().removeSchemaObject(session, c);

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        item.setIndex(getScanIndex(session));
        item.cost = item.getIndex().getCost(session, null);
        ArrayList<Index> indexes = getIndexes();
        if (indexes != null && masks != null) {
            for (int i = 1, size = indexes.size(); i < size; i++) {
                Index index = indexes.get(i);
                double cost = index.getCost(session, masks);
                if (cost < item.cost) {
                    item.cost = cost;
                    item.setIndex(index);
                }
            }

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     */
    public Index findPrimaryKey() {
        ArrayList<Index> indexes = getIndexes();
        if (indexes != null) {
            for (int i = 0, size = indexes.size(); i < size; i++) {
                Index idx = indexes.get(i);
                if (idx.getIndexType().isPrimaryKey()) {
                    return idx;
                }
            }
        }
        return null;

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        }
        return null;
    }


    public Index getPrimaryKey() {
        Index index = findPrimaryKey();
        if (index != null) {
            return index;
        }
        throw DbException.get(ErrorCode.INDEX_NOT_FOUND_1, Constants.PREFIX_PRIMARY_KEY);
    }

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