diff options
Diffstat (limited to 'utils/src/main/java/org')
3 files changed, 348 insertions, 0 deletions
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 80eddb86..d3d69812 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 @@ -211,6 +211,16 @@ public class StandardCoder implements Coder { } /** + * Encodes an object into a json tree, without catching exceptions. + * + * @param object object to be encoded + * @return a json element representing the object + */ + protected JsonElement toJsonTree(Object object) { + return GSON.toJsonTree(object); + } + + /** * Encodes an object into json, without catching exceptions. * * @param object object to be encoded @@ -232,6 +242,17 @@ public class StandardCoder implements Coder { } /** + * Decodes a json element into an object, without catching exceptions. + * + * @param json json element to be decoded + * @param clazz class of object to be decoded + * @return the object represented by the given json element + */ + protected <T> T fromJson(JsonElement json, Class<T> clazz) { + return convertFromDouble(clazz, GSON.fromJson(json, clazz)); + } + + /** * Decodes a json string into an object, without catching exceptions. * * @param json json string to be decoded diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java new file mode 100644 index 00000000..357b106e --- /dev/null +++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardYamlCoder.java @@ -0,0 +1,264 @@ +/*- + * ============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.utils.coder; + +import com.google.gson.JsonArray; +import com.google.gson.JsonElement; +import com.google.gson.JsonNull; +import com.google.gson.JsonObject; +import com.google.gson.JsonPrimitive; +import java.io.IOException; +import java.io.Reader; +import java.io.StringReader; +import java.io.StringWriter; +import java.io.Writer; +import java.util.ArrayList; +import java.util.List; +import java.util.Map.Entry; +import org.yaml.snakeyaml.DumperOptions; +import org.yaml.snakeyaml.Yaml; +import org.yaml.snakeyaml.emitter.Emitter; +import org.yaml.snakeyaml.error.YAMLException; +import org.yaml.snakeyaml.nodes.MappingNode; +import org.yaml.snakeyaml.nodes.Node; +import org.yaml.snakeyaml.nodes.NodeTuple; +import org.yaml.snakeyaml.nodes.ScalarNode; +import org.yaml.snakeyaml.nodes.SequenceNode; +import org.yaml.snakeyaml.nodes.Tag; +import org.yaml.snakeyaml.resolver.Resolver; +import org.yaml.snakeyaml.serializer.Serializer; + +/** + * YAML encoder and decoder using the "standard" mechanism, which is currently gson. All + * of the methods perform conversion to/from YAML (instead of JSON). + */ +public class StandardYamlCoder extends StandardCoder { + + /** + * Constructs the object. + */ + public StandardYamlCoder() { + super(); + } + + @Override + protected String toJson(Object object) { + StringWriter output = new StringWriter(); + toJson(output, object); + return output.toString(); + } + + @Override + protected void toJson(Writer target, Object object) { + DumperOptions dumper = new DumperOptions(); + Serializer serializer = new Serializer(new Emitter(target, dumper), new Resolver(), dumper, null); + + try { + serializer.open(); + serializer.serialize(makeYaml(toJsonTree(object))); + serializer.close(); + + } catch (IOException e) { + throw new YAMLException(e); + } + } + + @Override + protected <T> T fromJson(String yaml, Class<T> clazz) { + Node node = new Yaml().compose(new StringReader(yaml)); + return fromJson(makeGson(node), clazz); + } + + @Override + protected <T> T fromJson(Reader source, Class<T> clazz) { + Node node = new Yaml().compose(source); + return fromJson(makeGson(node), clazz); + } + + /** + * Converts an arbitrary gson element into a corresponding Yaml node. + * + * @param jel gson element to be converted + * @return a yaml node corresponding to the element + */ + private Node makeYaml(JsonElement jel) { + if (jel.isJsonArray()) { + return makeYamlSequence((JsonArray) jel); + + } else if (jel.isJsonObject()) { + return makeYamlMap((JsonObject) jel); + + } else if (jel.isJsonPrimitive()) { + return makeYamlPrim((JsonPrimitive) jel); + + } else { + return new ScalarNode(Tag.NULL, "", null, null, DumperOptions.ScalarStyle.PLAIN); + } + } + + /** + * Converts an arbitrary gson array into a corresponding Yaml sequence. + * + * @param jel gson element to be converted + * @return a yaml node corresponding to the element + */ + private Node makeYamlSequence(JsonArray jel) { + List<Node> nodes = new ArrayList<>(jel.size()); + jel.forEach(item -> nodes.add(makeYaml(item))); + + return new SequenceNode(Tag.SEQ, true, nodes, null, null, DumperOptions.FlowStyle.AUTO); + } + + /** + * Converts an arbitrary gson object into a corresponding Yaml map. + * + * @param jel gson element to be converted + * @return a yaml node corresponding to the element + */ + private Node makeYamlMap(JsonObject jel) { + List<NodeTuple> nodes = new ArrayList<>(jel.size()); + + for (Entry<String, JsonElement> entry : jel.entrySet()) { + Node key = new ScalarNode(Tag.STR, entry.getKey(), null, null, DumperOptions.ScalarStyle.PLAIN); + Node value = makeYaml(entry.getValue()); + + nodes.add(new NodeTuple(key, value)); + } + + return new MappingNode(Tag.MAP, true, nodes, null, null, DumperOptions.FlowStyle.AUTO); + } + + /** + * Converts an arbitrary gson primitive into a corresponding Yaml scalar. + * + * @param jel gson element to be converted + * @return a yaml node corresponding to the element + */ + private Node makeYamlPrim(JsonPrimitive jel) { + Tag tag; + if (jel.isNumber()) { + Class<? extends Number> clazz = jel.getAsNumber().getClass(); + + if (clazz == Double.class || clazz == Float.class) { + tag = Tag.FLOAT; + + } else { + tag = Tag.INT; + } + + } else if (jel.isBoolean()) { + tag = Tag.BOOL; + + } else { + // treat anything else as a string + tag = Tag.STR; + } + + return new ScalarNode(tag, jel.getAsString(), null, null, DumperOptions.ScalarStyle.PLAIN); + } + + /** + * Converts an arbitrary Yaml node into a corresponding gson element. + * + * @param node node to be converted + * @return a gson element corresponding to the node + */ + private JsonElement makeGson(Node node) { + if (node instanceof MappingNode) { + return makeGsonObject((MappingNode) node); + + } else if (node instanceof SequenceNode) { + return makeGsonArray((SequenceNode) node); + + } else { + return makeGsonPrim((ScalarNode) node); + } + + // yaml doesn't appear to use anchor nodes when decoding so ignore them for now + } + + /** + * Converts a Yaml sequence into a corresponding gson array. + * + * @param node node to be converted + * @return a gson element corresponding to the node + */ + private JsonElement makeGsonArray(SequenceNode node) { + List<Node> nodes = node.getValue(); + + JsonArray array = new JsonArray(nodes.size()); + nodes.forEach(subnode -> array.add(makeGson(subnode))); + + return array; + } + + /** + * Converts a Yaml map into a corresponding gson object. + * + * @param node node to be converted + * @return a gson element corresponding to the node + */ + private JsonElement makeGsonObject(MappingNode node) { + JsonObject obj = new JsonObject(); + + for (NodeTuple tuple : node.getValue()) { + Node key = tuple.getKeyNode(); + String skey = ((ScalarNode) key).getValue(); + + obj.add(skey, makeGson(tuple.getValueNode())); + } + + return obj; + } + + /** + * Converts a Yaml scalar into a corresponding gson primitive. + * + * @param node node to be converted + * @return a gson element corresponding to the node + */ + private JsonElement makeGsonPrim(ScalarNode node) { + try { + Tag tag = node.getTag(); + + if (tag == Tag.INT) { + return new JsonPrimitive(Long.valueOf(node.getValue())); + + } else if (tag == Tag.FLOAT) { + return new JsonPrimitive(Double.valueOf(node.getValue())); + + } else if (tag == Tag.BOOL) { + return new JsonPrimitive(Boolean.valueOf(node.getValue())); + + } else if (tag == Tag.NULL) { + return JsonNull.INSTANCE; + + } else { + // treat anything else as a string + return new JsonPrimitive(node.getValue()); + } + + } catch (NumberFormatException ex) { + // just treat it as a string + return new JsonPrimitive(node.getValue()); + } + } +} diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/YamlException.java b/utils/src/main/java/org/onap/policy/common/utils/coder/YamlException.java new file mode 100644 index 00000000..d6591b3b --- /dev/null +++ b/utils/src/main/java/org/onap/policy/common/utils/coder/YamlException.java @@ -0,0 +1,63 @@ +/*- + * ============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.utils.coder; + +import org.yaml.snakeyaml.error.Mark; + +/** + * Runtime Exception generated by StandardYamlCoder. + */ +public class YamlException extends RuntimeException { + private static final long serialVersionUID = 1L; + + private final Mark problemMark; + + + /** + * Constructs the object. + * + * @param reason reason for the exception + * @param problemMark where the exception occurred within the input + */ + public YamlException(String reason, Mark problemMark) { + super(reason); + + this.problemMark = problemMark; + } + + /** + * Constructs the object. + * + * @param reason reason for the exception + * @param problemMark where the exception occurred within the input + * @param cause cause of the exception + */ + public YamlException(String reason, Mark problemMark, Throwable cause) { + super(reason, cause); + + this.problemMark = problemMark; + } + + @Override + public String getMessage() { + return super.getMessage() + problemMark; + } +} |