diff options
Diffstat (limited to 'model/utilities')
3 files changed, 118 insertions, 0 deletions
diff --git a/model/utilities/pom.xml b/model/utilities/pom.xml index fbf1a21fe..90b9937d8 100644 --- a/model/utilities/pom.xml +++ b/model/utilities/pom.xml @@ -34,6 +34,11 @@ <artifactId>antlr4-runtime</artifactId> <version>4.6</version> </dependency> + <dependency> + <groupId>com.google.code.gson</groupId> + <artifactId>gson</artifactId> + <version>2.7</version> + </dependency> </dependencies> <build> diff --git a/model/utilities/src/main/java/org/onap/policy/apex/model/utilities/json/JSONHandler.java b/model/utilities/src/main/java/org/onap/policy/apex/model/utilities/json/JSONHandler.java new file mode 100644 index 000000000..eb42a4efa --- /dev/null +++ b/model/utilities/src/main/java/org/onap/policy/apex/model/utilities/json/JSONHandler.java @@ -0,0 +1,53 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. 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. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + +package org.onap.policy.apex.model.utilities.json; + +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.Reader; + +import com.google.gson.Gson; +import com.google.gson.GsonBuilder; + +/** + * This class reads objects of the given class from an input stream. + * + * @author Liam Fallon (liam.fallon@ericsson.com) + * @param <TYPE> the generic type + */ +public class JSONHandler<TYPE> { + + /** + * This method reads objects of a given class from an input stream. + * + * @param inputClass The class to read + * @param inputStream the input stream to read from + * @return the object read + */ + public TYPE read(final Class<TYPE> inputClass, final InputStream inputStream) { + // Register the adapters for our carrier technologies and event protocols with GSON + final GsonBuilder gsonBuilder = new GsonBuilder(); + + final Gson gson = gsonBuilder.serializeNulls().create(); + final Reader jsonResourceReader = new InputStreamReader(inputStream); + return gson.fromJson(jsonResourceReader, inputClass); + } +} diff --git a/model/utilities/src/test/java/org/onap/policy/apex/model/utilities/json/JSONHandlerTest.java b/model/utilities/src/test/java/org/onap/policy/apex/model/utilities/json/JSONHandlerTest.java new file mode 100644 index 000000000..b8e2cebbc --- /dev/null +++ b/model/utilities/src/test/java/org/onap/policy/apex/model/utilities/json/JSONHandlerTest.java @@ -0,0 +1,60 @@ +/*- + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. 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. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ +package org.onap.policy.apex.model.utilities.json; + +import static org.junit.Assert.assertEquals; + +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.nio.charset.StandardCharsets; + +import org.junit.Test; + +import com.google.gson.GsonBuilder; + +public class JSONHandlerTest { + + private static final String VALUE = "value"; + + @Test + public void testAssertions() throws IOException { + final OverTheMoonObject jsonObject = new OverTheMoonObject(VALUE); + final String jsonString = new GsonBuilder().create().toJson(jsonObject); + + final byte[] bytes = jsonString.getBytes(StandardCharsets.UTF_8); + try (final InputStream inputStream = new ByteArrayInputStream(bytes);) { + + final JSONHandler<OverTheMoonObject> objUnderTest = new JSONHandler<>(); + + final OverTheMoonObject actualObject = objUnderTest.read(OverTheMoonObject.class, inputStream); + assertEquals(VALUE, actualObject.name); + } + + } + + private class OverTheMoonObject { + private final String name; + + public OverTheMoonObject(final String name) { + this.name = name; + } + } +} |