Add `GetPropertyValue` function

Linearly search through properties for given key, if found, return value,
else return error object.

2 files changed, 29 insertions, 0 deletions

diff --git a/gohadoopxml.go b/gohadoopxml.go
index d6d5721..336a673 100644
--- a/gohadoopxml.go
+++ b/gohadoopxml.go
@@ -2,6 +2,7 @@ package gohadoopxml
 
 import (
 	"encoding/xml"
+	"errors"
 	"io/ioutil"
 	"log"
 	"os"
@@ -36,6 +37,15 @@ func ParseXML(filename string) (Configuration, error) {
 	return config, nil
 }
 
+func GetPropertyValue(key string, config Configuration) (string, error) {
+	for _, p := range config.Properties {
+		if key == p.Name {
+			return p.Value, nil
+		}
+	}
+	return "", errors.New("Key not found")
+}
+
 func MergeConfigurations(configs ...Configuration) Configuration {
 	var new_config Configuration
 	for _, config := range configs {
diff --git a/gohadoopxml_test.go b/gohadoopxml_test.go
index aa81010..ab6c36e 100644
--- a/gohadoopxml_test.go
+++ b/gohadoopxml_test.go
@@ -38,3 +38,22 @@ func TestMergeConfiguration(t *testing.T) {
 		t.Fail()
 	}
 }
+
+func TestGetPropertyValue(t *testing.T) {
+	var config = Configuration{
+		Properties: []Property{
+			{
+				Name:  "foo",
+				Value: "bar",
+			},
+		},
+	}
+	result, err := GetPropertyValue("foo", config)
+	if err != nil || result != "bar" {
+		t.Fail()
+	}
+	result, err = GetPropertyValue("fizz", config)
+	if err == nil {
+		t.Fail()
+	}
+}