--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/component/links/__init__.py	Thu Oct 08 13:37:29 2015 +0200
@@ -0,0 +1,129 @@
+#
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+
+# import interfaces
+from hypatia.interfaces import ICatalog
+from pyams_content.component.links.interfaces import IBaseLink, IInternalLink, IExternalLink
+from pyams_content.shared.common.interfaces import IWfSharedContent
+from pyams_form.interfaces.form import IFormContextPermissionChecker
+from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectModifiedEvent, IObjectRemovedEvent
+
+# import packages
+from hypatia.catalog import CatalogQuery
+from hypatia.query import Eq, Any
+from persistent import Persistent
+from pyams_catalog.query import CatalogResultSet
+from pyams_content.workflow import VISIBLE_STATES
+from pyams_sequence.utility import get_last_version
+from pyams_utils.adapter import adapter_config, ContextAdapter
+from pyams_utils.registry import get_utility
+from pyams_utils.traversing import get_parent
+from pyams_utils.url import absolute_url
+from pyramid.events import subscriber
+from pyramid.threadlocal import get_current_registry
+from zope.lifecycleevent import ObjectModifiedEvent
+from zope.container.contained import Contained
+from zope.interface import implementer
+from zope.schema.fieldproperty import FieldProperty
+
+
+@implementer(IBaseLink)
+class BaseLink(Persistent, Contained):
+    """Base link persistent class"""
+
+    title = FieldProperty(IBaseLink['title'])
+    description = FieldProperty(IBaseLink['description'])
+
+
+@adapter_config(context=IBaseLink, provides=IFormContextPermissionChecker)
+class BaseLinkPermissionChecker(ContextAdapter):
+    """Base link permission checker"""
+
+    @property
+    def edit_permission(self):
+        content = get_parent(self.context, IWfSharedContent)
+        return IFormContextPermissionChecker(content).edit_permission
+
+
+@subscriber(IObjectAddedEvent, context_selector=IBaseLink)
+def handle_added_link(event):
+    """Handle added link"""
+    content = get_parent(event.object, IWfSharedContent)
+    if content is not None:
+        get_current_registry().notify(ObjectModifiedEvent(content))
+
+
+@subscriber(IObjectModifiedEvent, context_selector=IBaseLink)
+def handle_modified_link(event):
+    """Handle modified link"""
+    content = get_parent(event.object, IWfSharedContent)
+    if content is not None:
+        get_current_registry().notify(ObjectModifiedEvent(content))
+
+
+@subscriber(IObjectRemovedEvent, context_selector=IBaseLink)
+def handle_removed_link(event):
+    """Handle removed link"""
+    content = get_parent(event.object, IWfSharedContent)
+    if content is not None:
+        get_current_registry().notify(ObjectModifiedEvent(content))
+
+
+@implementer(IInternalLink)
+class InternalLink(BaseLink):
+    """Internal link persistent class"""
+
+    reference = FieldProperty(IInternalLink['reference'])
+
+    def get_target(self, state=None):
+        catalog = get_utility(ICatalog)
+        params = Eq(catalog['oid'], self.reference)
+        if state:
+            if not isinstance(state, (list, tuple)):
+                state = (state, )
+            params &= Any(catalog['workflow_state'], state)
+            results = list(CatalogResultSet(CatalogQuery(catalog).query(params)))
+            if results:
+                return results[0]
+        else:
+            results = list(map(get_last_version, CatalogResultSet(CatalogQuery(catalog).query(params))))
+            if results:
+                return results[0]
+
+    def get_editor_url(self):
+        return 'oid://{0}'.format(self.reference)
+
+    def get_url(self, request, view_name=None):
+        target = self.get_target(state=VISIBLE_STATES)
+        if target is not None:
+            return absolute_url(target, request, view_name)
+        else:
+            return ''
+
+
+@implementer(IExternalLink)
+class ExternalLink(BaseLink):
+    """external link persistent class"""
+
+    url = FieldProperty(IExternalLink['url'])
+    language = FieldProperty(IExternalLink['language'])
+
+    def get_editor_url(self):
+        return self.url
+
+    def get_url(self, request, view_name=None):
+        return self.url