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170 lines
4.6 KiB
C
170 lines
4.6 KiB
C
/*
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** Copyright (C) 2008-2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#ifndef __MU_MSG_ITER_H__
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#define __MU_MSG_ITER_H__
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#include <glib.h>
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#include <mu-msg.h>
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G_BEGIN_DECLS
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/**
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* MuMsgIter is a structure to iterate over the results of a
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* query. You can iterate only in one-direction, and you can do it
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* only once.
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*
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*/
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struct _MuMsgIter;
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typedef struct _MuMsgIter MuMsgIter;
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/**
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* create a new MuMsgIter -- basically, an iterator over the search
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* results
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*
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* @param enq a Xapian::Enquire* cast to XapianEnquire* (because this
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* is C, not C++),providing access to search results
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* @param batchsize how many results to retrieve at once
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* @param threads whether to calculate threads
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* @param sorting field when using threads; note, when 'threads' is
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* FALSE, this should be MU_MSG_FIELD_ID_NONE
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* @param if TRUE, revert the sorting order
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* @param err receives error information. if the error is MU_ERROR_XAPIAN_MODIFIED,
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* the database should be reloaded.
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*
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* @return a new MuMsgIter, or NULL in case of error
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*/
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MuMsgIter *mu_msg_iter_new (XapianEnquire *enq,
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size_t batchsize, gboolean threads,
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MuMsgFieldId threadsortfield,
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gboolean revert,
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GError **err) G_GNUC_WARN_UNUSED_RESULT;
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/**
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* get the next message (which you got from
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* e.g. mu_query_run)
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return TRUE if it succeeded, FALSE otherwise (e.g., because there
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* are no more messages in the query result)
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*/
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gboolean mu_msg_iter_next (MuMsgIter *iter);
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/**
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* reset the iterator to the beginning
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return TRUE if it succeeded, FALSE otherwise
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*/
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gboolean mu_msg_iter_reset (MuMsgIter *iter);
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/**
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* does this iterator point past the end of the list?
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return TRUE if the iter points past end of the list, FALSE
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* otherwise
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*/
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gboolean mu_msg_iter_is_done (MuMsgIter *iter);
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/**
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* destroy the sequence of messages; ie. /all/ of them
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*
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* @param msg a valid MuMsgIter message or NULL
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*/
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void mu_msg_iter_destroy (MuMsgIter *iter);
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/**
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* get the corresponding MuMsg for this iter; this instance is owned
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* by MuMsgIter, and becomes invalid after either mu_msg_iter_destroy
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* or mu_msg_iter_next. _do not_ unref it; it's a floating reference.
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*
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* @param iter a valid MuMsgIter instance*
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*
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* @return a MuMsg instance, or NULL in case of error
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*/
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MuMsg* mu_msg_iter_get_msg_floating (MuMsgIter *iter)
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G_GNUC_MALLOC G_GNUC_WARN_UNUSED_RESULT;
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/**
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* get the document id for the current message
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return the docid or (unsigned int)-1 in case of error
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*/
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unsigned int mu_msg_iter_get_docid (MuMsgIter *iter);
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/**
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* calculate the message threads
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return TRUE if it worked, FALSE otherwsie.
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*/
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gboolean mu_msg_iter_calculate_threads (MuMsgIter *iter);
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enum _MuMsgIterThreadProp {
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MU_MSG_ITER_THREAD_PROP_ROOT = 1 << 0,
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MU_MSG_ITER_THREAD_PROP_FIRST_CHILD = 1 << 1,
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MU_MSG_ITER_THREAD_PROP_EMPTY_PARENT = 1 << 2,
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MU_MSG_ITER_THREAD_PROP_DUP = 1 << 3,
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MU_MSG_ITER_THREAD_PROP_HAS_CHILD = 1 << 4
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};
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typedef guint8 MuMsgIterThreadProp;
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struct _MuMsgIterThreadInfo {
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gchar *threadpath; /* a string decribing the thread-path in
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* such a way that we can sort by this
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* string to get the right order. */
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guint level; /* thread-depth -- [0...] */
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MuMsgIterThreadProp prop;
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};
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typedef struct _MuMsgIterThreadInfo MuMsgIterThreadInfo;
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/**
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* get a the MuMsgThreaderInfo struct for this message; this only
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* works when you created the mu-msg-iter with threading enabled
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*
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* @param iter a valid MuMsgIter iterator
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*
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* @return an info struct
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*/
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const MuMsgIterThreadInfo* mu_msg_iter_get_thread_info (MuMsgIter *iter);
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/* FIXME */
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const char* mu_msg_iter_get_path (MuMsgIter *iter);
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G_END_DECLS
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#endif /*__MU_MSG_ITER_H__*/
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