Adding DurationMetadataProvider.

Author: Pol Dell'Aiera

lib/metadata/DurationMetadataProvider.class.php

@@ -0,0 +1,82 @@
+<?php
+
+class DurationMetadataProvider implements MetadataProvider {
+
+  public $capabilities = array('duration', 'movingDuration', 'stopDuration');
+
+  public function provides($key) {
+    if (in_array($key, $this->capabilities)) {return TRUE;};
+    return FALSE;
+  }
+
+  public function has($target, $key) {
+    return isset($target->metadata['metadatas'][__CLASS__]) && isset($target->metadata['metadatas'][__CLASS__][$key]) && !is_null($target->metadata['metadatas'][__CLASS__][$key]) && (in_array($key, $this->capabilities)) && ($target instanceof Collection);
+  }
+
+  public function get($target, $key, $options) {
+
+    if ($target instanceof MultiLineString) {
+
+      if ($key == 'duration') {
+        $duration = 0;
+        foreach ($target->components as $component) {
+          $duration += $component->getMetadata('duration');
+        }
+        return $duration;
+      }
+    }
+
+
+    if ($target instanceof LineString) {
+      if ($key == 'duration') {
+        $point_a = $target->startPoint();
+        $point_b = $target->endPoint();
+
+        if (!is_null($point_a->getMetadata('time')) && !is_null($point_b->getMetadata('time'))) {
+          $time = strtotime($point_b->getMetadata('time')) - strtotime($point_a->getMetadata('time'));
+        }
+        return $time;
+      }
+
+      if ($key == 'stopDuration') {
+        $duration = 0;
+        foreach ($target->explode() as $LineString) {
+          $point_a = $LineString->startPoint();
+          $point_b = $LineString->endPoint();
+          if (!is_null($point_a->getMetadata('time')) && !is_null($point_b->getMetadata('time'))) {
+            $time = strtotime($point_b->getMetadata('time')) - strtotime($point_a->getMetadata('time'));
+          } else {
+            $time = 0;
+          }
+
+          $length = $LineString->greatCircleLength();
+
+          if ($length >= 0 && $length <= $options['threshold']) {
+            $duration += $time;
+          }
+
+        }
+
+        return $duration;
+      }
+
+      if ($key == 'movingDuration') {
+        return $this->get($target, 'duration', $options) - $this->get($target, 'stopDuration', $options);
+      }
+    }
+
+  }
+
+  public function set($target, $key, $value) {
+    if ($key === 'duration') {
+      $target->metadata['metadatas'][__CLASS__][$key] = $value;
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+  public function id() {
+    return __CLASS__;
+  }
+
+}