1 files changed, 94 insertions, 0 deletions
diff --git a/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriter.java b/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriter.java
new file mode 100644
index 000000000..a9df23afc
--- /dev/null
+++ b/model/src/main/java/org/onap/policy/apex/model/basicmodel/handling/ApexModelStringWriter.java
@@ -0,0 +1,94 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ *  Modifications Copyright (C) 2019-2022 Nordix Foundation.
+ * ================================================================================
+ * 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.basicmodel.handling;
+
+import java.io.ByteArrayOutputStream;
+import lombok.Getter;
+import lombok.Setter;
+import org.onap.policy.apex.model.basicmodel.concepts.ApexException;
+import org.onap.policy.apex.model.basicmodel.concepts.AxConcept;
+import org.onap.policy.common.utils.validation.Assertions;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * This class writes an Apex concept to a string.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ * @param <C> the type of Apex concept to write to a string, must be a sub class of {@link AxConcept}
+ */
+@Getter
+@Setter
+public class ApexModelStringWriter<C extends AxConcept> {
+    private static final XLogger LOGGER = XLoggerFactory.getXLogger(ApexModelStringWriter.class);
+
+    // Should concepts being written to files be valid
+    private boolean validate;
+
+    /**
+     * Constructor, set the validation flag.
+     *
+     * @param validate Should validation be performed prior to output
+     */
+    public ApexModelStringWriter(final boolean validate) {
+        this.validate = validate;
+    }
+
+    /**
+     * Write a concept to a string.
+     *
+     * @param concept The concept to write
+     * @param rootConceptClass The concept class
+     * @return The string with the concept
+     * @throws ApexException thrown on errors
+     */
+    public String writeString(final C concept, final Class<C> rootConceptClass)
+                    throws ApexException {
+        Assertions.argumentNotNull(concept, "concept may not be null");
+
+        return writeJsonString(concept, rootConceptClass);
+    }
+
+    /**
+     * Write a concept to a JSON string.
+     *
+     * @param concept The concept to write
+     * @param rootConceptClass The concept class
+     * @return The string with the concept
+     * @throws ApexException thrown on errors
+     */
+    public String writeJsonString(final C concept, final Class<C> rootConceptClass) throws ApexException {
+        LOGGER.debug("running writeJSONString . . .");
+
+        final ApexModelWriter<C> conceptWriter = new ApexModelWriter<>(rootConceptClass);
+        conceptWriter.setValidate(validate);
+
+        try (var baOutputStream = new ByteArrayOutputStream()) {
+            conceptWriter.write(concept, baOutputStream);
+            return baOutputStream.toString();
+        } catch (final Exception e) {
+            LOGGER.warn("error writing JSON string", e);
+            throw new ApexException("error writing JSON string", e);
+        }
+
+    }
+}