Improve maven support.

ognibuild/buildlog.py

@@ -141,9 +141,11 @@ def problem_to_upstream_requirement(problem):  # noqa: C901
     elif isinstance(problem, MissingJavaClass):
         return JavaClassRequirement(problem.classname)
     elif isinstance(problem, MissingHaskellDependencies):
-        return [HaskellPackageRequirement.from_string(dep) for dep in problem.deps]
+        return [HaskellPackageRequirement.from_string(dep)
+                for dep in problem.deps]
     elif isinstance(problem, MissingMavenArtifacts):
-        return [MavenArtifactRequirement(artifact) for artifact in problem.artifacts]
+        return [MavenArtifactRequirement.from_str(artifact)
+                for artifact in problem.artifacts]
     elif isinstance(problem, MissingCSharpCompiler):
         return BinaryRequirement("msc")
     elif isinstance(problem, GnomeCommonMissing):

ognibuild/buildsystem.py

@@ -41,6 +41,7 @@ from .requirements import (
     RPackageRequirement,
     OctavePackageRequirement,
     PhpPackageRequirement,
+    MavenArtifactRequirement,
 )
 from .fix_build import run_with_build_fixers
 from .session import which
@@ -1209,6 +1210,23 @@ class Maven(BuildSystem):
         # is that what we need?
         raise NotImplementedError
 
+    def get_declared_dependencies(self, session, fixers=None):
+        import xml.etree.ElementTree as ET
+        try:
+            root = xmlparse_simplify_namespaces(self.path,
+                ['http://maven.apache.org/POM/4.0.0'])
+        except ET.ParseError as e:
+            logging.warning('Unable to parse package.xml: %s', e)
+            return
+        assert root.tag == 'project', 'root tag is %r' % root.tag
+        deps_tag = root.find('dependencies')
+        if deps_tag:
+            for dep in deps_tag.findall('dependency'):
+                yield "core", MavenArtifactRequirement(
+                    dep.find('groupId').text,
+                    dep.find('artifactId').text,
+                    dep.find('version').text)
+
 
 class Cabal(BuildSystem):
 

ognibuild/requirements.py

@@ -429,11 +429,41 @@ class HaskellPackageRequirement(Requirement):
 
 class MavenArtifactRequirement(Requirement):
 
-    artifacts: List[Tuple[str, str, str]]
+    group_id: str
+    artifact_id: str
+    version: Optional[str]
+    kind: Optional[str]
 
-    def __init__(self, artifacts):
+    def __init__(self, group_id, artifact_id, version=None, kind=None):
         super(MavenArtifactRequirement, self).__init__("maven-artifact")
-        self.artifacts = artifacts
+        self.group_id = group_id
+        self.artifact_id = artifact_id
+        self.version = version
+        self.kind = kind
+
+    def __str__(self):
+        return "maven requirement: %s:%s:%s" % (
+            self.group_id, self.artifact_id, self.version)
+
+    @classmethod
+    def from_str(cls, text):
+        return cls.from_tuple(text.split(':'))
+
+    @classmethod
+    def from_tuple(cls, parts):
+        if len(parts) == 4:
+            (group_id, artifact_id, kind, version) = parts
+        elif len(parts) == 3:
+            (group_id, artifact_id, version) = parts
+            kind = "jar"
+        elif len(parts) == 2:
+            version = None
+            (group_id, artifact_id) = parts
+            kind = "jar"
+        else:
+            raise ValueError(
+                "invalid number of parts to artifact %r" % parts)
+        return cls(group_id, artifact_id, version, kind)
 
 
 class GnomeCommonRequirement(Requirement):

ognibuild/resolver/apt.py

@@ -412,32 +412,25 @@ def resolve_haskell_package_req(apt_mgr, req):
 
 
 def resolve_maven_artifact_req(apt_mgr, req):
-    artifact = req.artifacts[0]
-    parts = artifact.split(":")
-    if len(parts) == 4:
-        (group_id, artifact_id, kind, version) = parts
-        regex = False
-    elif len(parts) == 3:
-        (group_id, artifact_id, version) = parts
-        kind = "jar"
-        regex = False
-    elif len(parts) == 2:
+    if req.version is None:
         version = ".*"
-        (group_id, artifact_id) = parts
-        kind = "jar"
         regex = True
+        escape = re.escape
     else:
-        raise AssertionError("invalid number of parts to artifact %s" % artifact)
-    paths = [
-        posixpath.join(
-            "/usr/share/maven-repo",
-            group_id.replace(".", "/"),
-            artifact_id,
+        version = req.version
+        regex = False
+        def escape(x):
+            return x
+    kind = req.kind or 'jar'
+    path = posixpath.join(
+            escape("/usr/share/maven-repo"),
+            escape(req.group_id.replace(".", "/")),
+            escape(req.artifact_id),
             version,
-            "%s-%s.%s" % (artifact_id, version, kind),
+            escape("%s-") + version + escape("." + kind)
         )
-    ]
-    return find_reqs_simple(apt_mgr, paths, regex=regex)
+
+    return find_reqs_simple(apt_mgr, [path], regex=regex)
 
 
 def resolve_gnome_common_req(apt_mgr, req):