QGIS/python/plugins/processing/algs/qgis/SaveSelectedFeatures.py

# -*- coding: utf-8 -*-

"""
***************************************************************************
    SaveSelectedFeatures.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

from qgis.core import (QgsFeatureSink,
                       QgsProcessingParameterVectorLayer,
                       QgsProcessingParameterFeatureSink,
                       QgsProcessingOutputVectorLayer)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm


class SaveSelectedFeatures(QgisAlgorithm):

    OUTPUT = 'OUTPUT'
    INPUT = 'INPUT'

    def group(self):
        return self.tr('Vector general tools')

    def __init__(self):
        super().__init__()

        self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT, self.tr('Input layer')))
        self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Selection')))
        self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr("Selection")))

        self.vectorLayer = None
        self.sink = None
        self.dest_id = None

    def name(self):
        return 'saveselectedfeatures'

    def displayName(self):
        return self.tr('Save selected features')

    def prepareAlgorithm(self, parameters, context, feedback):
        self.vectorLayer = self.parameterAsVectorLayer(parameters, self.INPUT, context)

        (self.sink, self.dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
                                                         self.vectorLayer.fields(), self.vectorLayer.wkbType(), self.vectorLayer.sourceCrs())
        return True

    def processAlgorithm(self, context, feedback):
        features = self.vectorLayer.getSelectedFeatures()
        count = int(self.vectorLayer.selectedFeatureCount())

        total = 100.0 / count if count else 1
        for current, feat in enumerate(features):
            if feedback.isCanceled():
                break

            self.sink.addFeature(feat, QgsFeatureSink.FastInsert)
            feedback.setProgress(int(current * total))
        return True

    def postProcessAlgorithm(self, context, feedback):
        return {self.OUTPUT: self.dest_id}