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Add a wrapper for C.H5Lexists for the CommonFG, returns nil if link e… #57

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merged 6 commits into from
Sep 20, 2019
Merged

Add a wrapper for C.H5Lexists for the CommonFG, returns nil if link e… #57

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835ed7b
Add a wrapper for C.H5Lexists for the CommonFG, returns nil if link e…
yuch3ng Sep 13, 2019
9224ab7
Change H5Lexists to LinkExists, return bool instead of err/nil
yuch3ng Sep 18, 2019
dde5841
fix bug in error displaying
yuch3ng Sep 18, 2019
8371706
Change from error to unexpected
Sep 19, 2019
bd2cff7
remove misleading errs from group test
Sep 19, 2019
cfa3a11
merge from remote's fix of golangci
Sep 19, 2019
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13 changes: 13 additions & 0 deletions h5g_group.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ package hdf5
import "C"

import (
"errors"
"fmt"
"unsafe"
)
Expand Down Expand Up @@ -162,3 +163,15 @@ func (g *Group) CreateTableFrom(name string, dtype interface{}, chunkSize, compr
func (g *Group) OpenTable(name string) (*Table, error) {
return openTable(g.id, name)
}

// CheckLink checks if a link( can be group or dataset or actual link )exsit or not. This method won't give you annoying hdf5 warnings when called in a goroutine
// CheckLink returns nil when a link exist, return an error when the link doesn't exist or some other error occured
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func (g *CommonFG) CheckLink(name string) error {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
status := C.H5Lexists(g.id, c_name, 0)
if status > 0 {
return nil
}
return errors.New("The link " + name + " does not exist or some other error occured")
}
19 changes: 19 additions & 0 deletions h5g_group_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,11 @@ func TestGroup(t *testing.T) {
defer os.Remove(fname)
defer f.Close()

err = f.CheckLink("/foo")
if err == nil {
t.Fatalf("err: %s", "/foo shouldn't exist at this time")
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}

g1, err := f.CreateGroup("foo")
if err != nil {
t.Fatalf("couldn't create group: %s", err)
Expand All @@ -28,6 +33,16 @@ func TestGroup(t *testing.T) {
t.Errorf("wrong Name for group: want %q, got %q", "/foo", g1.Name())
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}

err = f.CheckLink("/foo")
if err != nil {
t.Fatalf("err: %s", err)
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}

err = g1.CheckLink("bar")
if err == nil {
t.Fatalf("err: %s", "/foo shouldn't have bar as a child at this time")
}

g2, err := g1.CreateGroup("bar")
if err != nil {
t.Fatalf("couldn't create group: %s", err)
Expand All @@ -38,6 +53,10 @@ func TestGroup(t *testing.T) {
if g2.Name() != "/foo/bar" {
t.Errorf("wrong Name for group: want %q, got %q", "/foo/bar", g1.Name())
}
err = g1.CheckLink("bar")
if err != nil {
t.Fatalf("err: %s", err)
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}

g3, err := g2.CreateGroup("baz")
if err != nil {
Expand Down