diff options
Diffstat (limited to 'gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java')
-rw-r--r-- | gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java new file mode 100644 index 00000000..1c9d8b37 --- /dev/null +++ b/gson/src/main/java/org/onap/policy/common/gson/internal/FieldSerializer.java @@ -0,0 +1,80 @@ +/* + * ============LICENSE_START======================================================= + * ONAP + * ================================================================================ + * Copyright (C) 2019 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.gson.internal; + +import com.google.gson.Gson; +import com.google.gson.JsonElement; +import com.google.gson.JsonNull; +import com.google.gson.JsonObject; +import com.google.gson.JsonParseException; +import java.lang.reflect.Field; + +/** + * Serializer for fields that are exposed. + */ +public class FieldSerializer extends Adapter implements Serializer { + + public static final String GET_ERR = "cannot get field: "; + + /** + * Field within the object. + */ + private final Field field; + + /** + * Constructs the object. + * + * @param gson Gson object providing type adapters + * @param field field within the object + */ + public FieldSerializer(Gson gson, Field field) { + super(gson, field); + + this.field = field; + + field.setAccessible(true); + } + + @Override + public void addToTree(Object source, JsonObject target) { + Object value; + try { + value = getFromObject(source); + + } catch (IllegalArgumentException | IllegalAccessException e) { + throw new JsonParseException(makeError(GET_ERR), e); + } + + JsonElement jsonEl = (value == null ? JsonNull.INSTANCE : toJsonTree(value)); + target.add(getPropName(), jsonEl); + } + + /** + * Gets the field from the source object. Overridden during junit testing. + * + * @param source object containing the field + * @return the field's value + * @throws IllegalAccessException if an error occurs + */ + protected Object getFromObject(Object source) throws IllegalAccessException { + return field.get(source); + } +} |