Repository mirroring: working first version.

debian/list.go

@@ -0,0 +1,46 @@
+package debian
+
+import (
+	"fmt"
+)
+
+// PackageList is list of unique (by key) packages
+//
+// It could be seen as repo snapshot, repo contents, result of filtering,
+// merge, etc.
+type PackageList struct {
+	packages map[string]*Package
+}
+
+// NewPackageList creates empty package list
+func NewPackageList() *PackageList {
+	return &PackageList{packages: make(map[string]*Package, 1000)}
+}
+
+// Add appends package to package list, additionally checking for uniqueness
+func (l *PackageList) Add(p *Package) error {
+	key := string(p.Key())
+	existing, ok := l.packages[key]
+	if ok {
+		if !existing.Equals(p) {
+			return fmt.Errorf("conflict in package %s: %#v != %#v", p, existing, p)
+		}
+		return nil
+	}
+	l.packages[key] = p
+	return nil
+}
+
+// ForEach calls handler for each package in list
+//
+// TODO: Error handling
+func (l *PackageList) ForEach(handler func(*Package)) {
+	for _, p := range l.packages {
+		handler(p)
+	}
+}
+
+// Length returns number of packages in the list
+func (l *PackageList) Length() int {
+	return len(l.packages)
+}