rangecursor.java

berkeleyDB,强大的嵌入式数据,多个数据库的内核

                                        DatabaseEntry pKey,
                                        DatabaseEntry data,
                                        LockMode lockMode)
        throws DatabaseException {

        OperationStatus status;
        if (!initialized) {
            return getLast(key, pKey, data, lockMode);
        }
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetPrevNoDup(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        if (range.singleKey) {
            status = OperationStatus.NOTFOUND;
        } else {
            status = OperationStatus.NOTFOUND;
            Cursor oldCursor = beginOperation();
            try {
                status = doGetPrevNoDup(lockMode);
                if (status == OperationStatus.SUCCESS &&
                    !range.check(privKey)) {
                    status = OperationStatus.NOTFOUND;
                }
            } finally {
                endOperation(oldCursor, status, key, pKey, data);
            }
        }
        return status;
    }

    public OperationStatus getSearchKey(DatabaseEntry key,
                                        DatabaseEntry pKey,
                                        DatabaseEntry data,
                                        LockMode lockMode)
        throws DatabaseException {

        OperationStatus status;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetSearchKey(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        if (!range.check(key)) {
            status = OperationStatus.NOTFOUND;
        } else {
            shareData(key, privKey);
            status = doGetSearchKey(lockMode);
            endOperation(null, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getSearchBoth(DatabaseEntry key,
                                         DatabaseEntry pKey,
                                         DatabaseEntry data,
                                         LockMode lockMode)
        throws DatabaseException {

        OperationStatus status;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetSearchBoth(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        if (!range.check(key)) {
            status = OperationStatus.NOTFOUND;
        } else {
            shareData(key, privKey);
            if (secCursor != null) {
                shareData(pKey, privPKey);
            } else {
                shareData(data, privData);
            }
            status = doGetSearchBoth(lockMode);
            endOperation(null, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getSearchKeyRange(DatabaseEntry key,
                                             DatabaseEntry pKey,
                                             DatabaseEntry data,
                                             LockMode lockMode)
        throws DatabaseException {

        OperationStatus status = OperationStatus.NOTFOUND;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetSearchKeyRange(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        Cursor oldCursor = beginOperation();
        try {
            shareData(key, privKey);
            status = doGetSearchKeyRange(lockMode);
            if (status == OperationStatus.SUCCESS &&
                !range.check(privKey)) {
                status = OperationStatus.NOTFOUND;
            }
        } finally {
            endOperation(oldCursor, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getSearchBothRange(DatabaseEntry key,
                                              DatabaseEntry pKey,
                                              DatabaseEntry data,
                                              LockMode lockMode)
        throws DatabaseException {

        OperationStatus status = OperationStatus.NOTFOUND;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetSearchBothRange(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        Cursor oldCursor = beginOperation();
        try {
            shareData(key, privKey);
            if (secCursor != null) {
                shareData(pKey, privPKey);
            } else {
                shareData(data, privData);
            }
            status = doGetSearchBothRange(lockMode);
            if (status == OperationStatus.SUCCESS &&
                !range.check(privKey)) {
                status = OperationStatus.NOTFOUND;
            }
        } finally {
            endOperation(oldCursor, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getSearchRecordNumber(DatabaseEntry key,
                                                 DatabaseEntry pKey,
                                                 DatabaseEntry data,
                                                 LockMode lockMode)
        throws DatabaseException {

        OperationStatus status;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetSearchRecordNumber(lockMode);
            endOperation(null, status, null, null, null);
            return status;
        }
        if (!range.check(key)) {
            status = OperationStatus.NOTFOUND;
        } else {
            shareData(key, privKey);
            status = doGetSearchRecordNumber(lockMode);
            endOperation(null, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getNextDup(DatabaseEntry key,
                                      DatabaseEntry pKey,
                                      DatabaseEntry data,
                                      LockMode lockMode)
        throws DatabaseException {

        if (!initialized) {
            throw new DatabaseException("Cursor not initialized");
        }
        OperationStatus status;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetNextDup(lockMode);
            endOperation(null, status, null, null, null);
        } else {
            status = doGetNextDup(lockMode);
            endOperation(null, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getPrevDup(DatabaseEntry key,
                                      DatabaseEntry pKey,
                                      DatabaseEntry data,
                                      LockMode lockMode)
        throws DatabaseException {

        if (!initialized) {
            throw new DatabaseException("Cursor not initialized");
        }
        OperationStatus status;
        if (!range.hasBound()) {
            setParams(key, pKey, data);
            status = doGetPrevDup(lockMode);
            endOperation(null, status, null, null, null);
        } else {
            status = doGetPrevDup(lockMode);
            endOperation(null, status, key, pKey, data);
        }
        return status;
    }

    public OperationStatus getCurrent(DatabaseEntry key,
                                      DatabaseEntry pKey,
                                      DatabaseEntry data,
                                      LockMode lockMode)
        throws DatabaseException {

        if (!initialized) {
            throw new DatabaseException("Cursor not initialized");
        }
        if (secCursor != null && pKey != null) {
            return secCursor.getCurrent(key, pKey, data, lockMode);
        } else {
            return cursor.getCurrent(key, data, lockMode);
        }
    }

    /*
     * Pass-thru methods.
     */

    public void close()
        throws DatabaseException {

        currentTxn.closeCursor(cursor);
    }

    public int count()
        throws DatabaseException {

	return cursor.count();
    }

    public OperationStatus delete()
        throws DatabaseException {

	return cursor.delete();
    }

    public OperationStatus put(DatabaseEntry key, DatabaseEntry data)
        throws DatabaseException {

        return cursor.put(key, data);
    }

    public OperationStatus putNoOverwrite(DatabaseEntry key,
                                          DatabaseEntry data)
        throws DatabaseException {

        return cursor.putNoOverwrite(key, data);
    }

    public OperationStatus putNoDupData(DatabaseEntry key, DatabaseEntry data)
        throws DatabaseException {

        return cursor.putNoDupData(key, data);
    }

    public OperationStatus putCurrent(DatabaseEntry data)
        throws DatabaseException {

        return cursor.putCurrent(data);
    }

    public OperationStatus putAfter(DatabaseEntry key, DatabaseEntry data)
        throws DatabaseException {

        return DbCompat.putAfter(cursor, key, data);
    }

    public OperationStatus putBefore(DatabaseEntry key, DatabaseEntry data)
        throws DatabaseException {

        return DbCompat.putBefore(cursor, key, data);
    }

    private OperationStatus doGetFirst(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getFirst(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getFirst(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetLast(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getLast(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getLast(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetNext(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getNext(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getNext(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetNextDup(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getNextDup(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getNextDup(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetNextNoDup(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getNextNoDup(privKey, privPKey, privData,
                                          lockMode);
        } else {
            return cursor.getNextNoDup(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetPrev(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getPrev(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getPrev(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetPrevDup(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getPrevDup(privKey, privPKey, privData, lockMode);
        } else {
            return cursor.getPrevDup(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetPrevNoDup(LockMode lockMode)
        throws DatabaseException {

        if (secCursor != null && privPKey != null) {
            return secCursor.getPrevNoDup(privKey, privPKey, privData,
                                          lockMode);
        } else {
            return cursor.getPrevNoDup(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetSearchKey(LockMode lockMode)
        throws DatabaseException {

        if (isRecnoOrQueue && DbCompat.getRecordNumber(privKey) <= 0) {
            return OperationStatus.NOTFOUND;
        }
        if (secCursor != null && privPKey != null) {
            return secCursor.getSearchKey(privKey, privPKey, privData,
                                          lockMode);
        } else {
            return cursor.getSearchKey(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetSearchKeyRange(LockMode lockMode)
        throws DatabaseException {

        if (isRecnoOrQueue && DbCompat.getRecordNumber(privKey) <= 0) {
            return OperationStatus.NOTFOUND;
        }
        if (secCursor != null && privPKey != null) {
            return secCursor.getSearchKeyRange(privKey, privPKey, privData,
                                               lockMode);
        } else {
            return cursor.getSearchKeyRange(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetSearchBoth(LockMode lockMode)
        throws DatabaseException {

        if (isRecnoOrQueue && DbCompat.getRecordNumber(privKey) <= 0) {
            return OperationStatus.NOTFOUND;
        }
        if (secCursor != null && privPKey != null) {
            return secCursor.getSearchBoth(privKey, privPKey, privData,
                                           lockMode);
        } else {
            return cursor.getSearchBoth(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetSearchBothRange(LockMode lockMode)
        throws DatabaseException {

        if (isRecnoOrQueue && DbCompat.getRecordNumber(privKey) <= 0) {
            return OperationStatus.NOTFOUND;
        }
        if (secCursor != null && privPKey != null) {
            return secCursor.getSearchBothRange(privKey, privPKey, privData,
                                                lockMode);
        } else {
            return cursor.getSearchBothRange(privKey, privData, lockMode);
        }
    }

    private OperationStatus doGetSearchRecordNumber(LockMode lockMode)
        throws DatabaseException {

        if (DbCompat.getRecordNumber(privKey) <= 0) {
            return OperationStatus.NOTFOUND;
        }
        if (secCursor != null && privPKey != null) {
            return DbCompat.getSearchRecordNumber(secCursor, privKey, privPKey,
                                                  privData, lockMode);
        } else {
            return DbCompat.getSearchRecordNumber(cursor, privKey, privData,
                                                  lockMode);
        }
    }
}