*/
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.
*
* 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
*/
super();
}
+ @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);
--- /dev/null
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.coder;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import java.io.File;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.io.Writer;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CoderTest {
+ private static final Long LONG = 10L;
+ private static final Integer INTEGER = 10;
+ private static final String INT_TEXT = INTEGER.toString();
+ private static final String TEXT = "some text";
+ private static final String ENCODED = "encoded value";
+ private static final String DECODED = "decoded value";
+
+ private MyCoder coder;
+
+ @Before
+ public void setUp() {
+ coder = new MyCoder();
+ }
+
+ @Test
+ public void testConvert() throws CoderException {
+ assertNull(coder.convert(null, String.class));
+
+ // same class of object
+ assertEquals(TEXT, coder.convert(TEXT, String.class));
+ assertEquals(INTEGER, coder.convert(INTEGER, Integer.class));
+
+ // source is a string
+ assertEquals(INTEGER, coder.convert(TEXT, Integer.class));
+
+ // target is a string
+ assertEquals(INT_TEXT, coder.convert(INTEGER, String.class));
+
+ // source and target are different types, neither is a string
+ assertEquals(INTEGER, coder.convert(LONG, Integer.class));
+ }
+
+ private static class MyCoder implements Coder {
+ @Override
+ public String encode(Object object) throws CoderException {
+ return (object.getClass() == String.class ? ENCODED : INT_TEXT);
+ }
+
+ @Override
+ public String encode(Object object, boolean pretty) throws CoderException {
+ // unused
+ return null;
+ }
+
+ @Override
+ public void encode(Writer target, Object object) throws CoderException {
+ // unused
+ }
+
+ @Override
+ public void encode(OutputStream target, Object object) throws CoderException {
+ // unused
+ }
+
+ @Override
+ public void encode(File target, Object object) throws CoderException {
+ // unused
+ }
+
+ @Override
+ public <T> T decode(String json, Class<T> clazz) throws CoderException {
+ return (clazz == String.class ? clazz.cast(DECODED) : clazz.cast(INTEGER));
+ }
+
+ @Override
+ public <T> T decode(Reader source, Class<T> clazz) throws CoderException {
+ // unused
+ return null;
+ }
+
+ @Override
+ public <T> T decode(InputStream source, Class<T> clazz) throws CoderException {
+ // unused
+ return null;
+ }
+
+ @Override
+ public <T> T decode(File source, Class<T> clazz) throws CoderException {
+ // unused
+ return null;
+ }
+
+ @Override
+ public StandardCoderObject toStandard(Object object) throws CoderException {
+ // unused
+ return null;
+ }
+
+ @Override
+ public <T> T fromStandard(StandardCoderObject sco, Class<T> clazz) throws CoderException {
+ // unused
+ return null;
+ }
+ }
+}
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertSame;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.when;
coder = new StandardCoder();
}
+ @Test
+ public void testConvert() throws CoderException {
+ // null source
+ assertNull(coder.convert(null, StandardCoderObject.class));
+
+ // same class of object
+ StandardCoderObject sco = new StandardCoderObject();
+ assertSame(sco, coder.convert(sco, StandardCoderObject.class));
+
+ // source is a string
+ assertEquals(Integer.valueOf(10), coder.convert("10", Integer.class));
+
+ // target is a string
+ assertEquals("10", coder.convert(10, String.class));
+
+ // source and target are different types, neither is a string
+ sco = coder.convert(Map.of("hello", "world"), StandardCoderObject.class);
+ assertEquals("world", sco.getString("hello"));
+
+ // throw an exeception
+ coder = new StandardCoder() {
+ @Override
+ protected <T> T fromJson(JsonElement json, Class<T> clazz) {
+ throw jpe;
+ }
+ };
+ assertThatThrownBy(() -> coder.convert(10, Long.class)).isInstanceOf(CoderException.class).hasCause(jpe);
+ }
+
@Test
public void testEncodeObject() throws Exception {
List<Integer> arr = Arrays.asList(1100, 1110);
// test when decoding into a map
@SuppressWarnings("unchecked")
- Map<String,Object> map2 = coder.decode("{'intValue':10, 'dblVal':20.1}", TreeMap.class);
+ Map<String, Object> map2 = coder.decode("{'intValue':10, 'dblVal':20.1}", TreeMap.class);
assertEquals("{dblVal=20.1, intValue=10}", map2.toString());
}
Code Review / policy / common.git / commitdiff