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authorJim Hahn <jrh3@att.com>2020-02-17 13:21:08 -0500
committerJim Hahn <jrh3@att.com>2020-02-17 13:46:43 -0500
commitae4f69745dbbf780323b40d5345c287ea22776f9 (patch)
tree8a432ac0afcb29b7a996352ab52897af231c3646 /utils/src/main/java/org
parent840c5530cfa84d2b91200bf68c27a4f2bc67d1a4 (diff)
Add convert() to Coder
This addresses Liam's review comment about moving the "translate" method from the actor Util class into policy-common. Added a method to Coder to convert from one object type to another (e.g., from a Map to a POJO, or vice versa). Issue-ID: POLICY-2363 Signed-off-by: Jim Hahn <jrh3@att.com> Change-Id: I2a0b5ab4ce4b0eeda216a57cbe23a8bb64f64940
Diffstat (limited to 'utils/src/main/java/org')
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java34
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java33
2 files changed, 66 insertions, 1 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
index ec0e5e42..3049a5c2 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/Coder.java
@@ -32,6 +32,37 @@ import java.io.Writer;
public interface Coder {
/**
+ * Converts an object/POJO to an object of the given type.
+ *
+ * @param <T> desired type
+ * @param source source object
+ * @param clazz class of the desired object type
+ * @return the converted object
+ * @throws CoderException if an error occurs
+ */
+ default <S, T> T convert(S source, Class<T> clazz) throws CoderException {
+ if (source == null) {
+ return null;
+
+ } else if (clazz == source.getClass()) {
+ // same class - just cast it
+ return clazz.cast(source);
+
+ } else if (clazz == String.class) {
+ // target is a string - just encode the source
+ return (clazz.cast(encode(source)));
+
+ } else if (source.getClass() == String.class) {
+ // source is a string - just decode it
+ return decode(source.toString(), clazz);
+
+ } else {
+ // do it the long way: encode to a string and then decode the string
+ return decode(encode(source), clazz);
+ }
+ }
+
+ /**
* Encodes an object into json.
*
* @param object object to be encoded
@@ -44,7 +75,8 @@ public interface Coder {
* Encodes an object into json, optionally making it "pretty".
*
* @param object object to be encoded
- * @param pretty {@code true} if it should be encoded as "pretty" json, {@code false} otherwise
+ * @param pretty {@code true} if it should be encoded as "pretty" json, {@code false}
+ * otherwise
* @return a json string representing the object
* @throws CoderException if an error occurs
*/
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
index 13973f1c..9d444cae 100644
--- a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoder.java
@@ -78,6 +78,39 @@ public class StandardCoder implements Coder {
}
@Override
+ public <S, T> T convert(S source, Class<T> clazz) throws CoderException {
+ if (source == null) {
+ return null;
+
+ } else if (clazz == source.getClass()) {
+ // same class - just cast it
+ return clazz.cast(source);
+
+ } else if (clazz == String.class) {
+ // target is a string - just encode the source
+ return (clazz.cast(encode(source)));
+
+ } else if (source.getClass() == String.class) {
+ // source is a string - just decode it
+ return decode(source.toString(), clazz);
+
+ } else {
+ /*
+ * Do it the long way: encode to a tree and then decode the tree. This entire
+ * method could have been left out and the default Coder.convert() used
+ * instead, but this should perform slightly better as it only uses a
+ * JsonElement as the intermediate data structure, while Coder.convert() goes
+ * all the way to a String as the intermediate data structure.
+ */
+ try {
+ return fromJson(toJsonTree(source), clazz);
+ } catch (RuntimeException e) {
+ throw new CoderException(e);
+ }
+ }
+ }
+
+ @Override
public String encode(Object object) throws CoderException {
return encode(object, false);
}