Support text() condition

[cps.git] / cps-ri / src / main / java / org / onap / cps / spi / repository / FragmentRepositoryCpsPathQueryImpl.java

diff --git a/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java
new file mode 100644 (file)
index 0000000..4aa3e5f
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/repository/FragmentRepositoryCpsPathQueryImpl.java
@@ -0,0 +1,120 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 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.cps.spi.repository;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.onap.cps.cpspath.parser.CpsPathPrefixType;
+import org.onap.cps.cpspath.parser.CpsPathQuery;
+import org.onap.cps.spi.entities.FragmentEntity;
+
+public class FragmentRepositoryCpsPathQueryImpl implements FragmentRepositoryCpsPathQuery {
+
+    public static final String SIMILAR_TO_ABSOLUTE_PATH_PREFIX = "%/";
+    public static final String SIMILAR_TO_OPTIONAL_LIST_INDEX_POSTFIX = "(\\[[^/]*])?";
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    private static final Gson GSON = new GsonBuilder().create();
+
+    @Override
+    public List<FragmentEntity> findByAnchorAndCpsPath(final int anchorId, final CpsPathQuery cpsPathQuery) {
+        final var sqlStringBuilder = new StringBuilder("SELECT * FROM FRAGMENT WHERE anchor_id = :anchorId");
+        final Map<String, Object> queryParameters = new HashMap<>();
+        queryParameters.put("anchorId", anchorId);
+        sqlStringBuilder.append(" AND xpath SIMILAR TO :xpathRegex");
+        final String xpathRegex = getSimilarToXpathSqlRegex(cpsPathQuery);
+        queryParameters.put("xpathRegex", xpathRegex);
+        if (cpsPathQuery.hasLeafConditions()) {
+            sqlStringBuilder.append(" AND attributes @> :leafDataAsJson\\:\\:jsonb");
+            queryParameters.put("leafDataAsJson", GSON.toJson(cpsPathQuery.getLeavesData()));
+        }
+
+        addTextFunctionCondition(cpsPathQuery, sqlStringBuilder, queryParameters);
+        final var query = entityManager.createNativeQuery(sqlStringBuilder.toString(), FragmentEntity.class);
+        setQueryParameters(query, queryParameters);
+        return query.getResultList();
+    }
+
+    @NotNull
+    private static String getSimilarToXpathSqlRegex(final CpsPathQuery cpsPathQuery) {
+        final var xpathRegexBuilder = new StringBuilder();
+        if (CpsPathPrefixType.ABSOLUTE.equals(cpsPathQuery.getCpsPathPrefixType())) {
+            xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getXpathPrefix()));
+        } else {
+            xpathRegexBuilder.append(SIMILAR_TO_ABSOLUTE_PATH_PREFIX);
+            xpathRegexBuilder.append(escapeXpath(cpsPathQuery.getDescendantName()));
+        }
+        xpathRegexBuilder.append(SIMILAR_TO_OPTIONAL_LIST_INDEX_POSTFIX);
+        return xpathRegexBuilder.toString();
+    }
+
+    @NotNull
+    private static String escapeXpath(final String xpath) {
+        // See https://jira.onap.org/browse/CPS-500 for limitations of this basic escape mechanism
+        return xpath.replace("[@", "\\[@");
+    }
+
+    @Nullable
+    private static Integer getTextValueAsInt(final CpsPathQuery cpsPathQuery) {
+        try {
+            return Integer.parseInt(cpsPathQuery.getTextFunctionConditionValue());
+        } catch (final NumberFormatException e) {
+            return null;
+        }
+    }
+
+    private static void addTextFunctionCondition(final CpsPathQuery cpsPathQuery, final StringBuilder sqlStringBuilder,
+                                                 final Map<String, Object> queryParameters) {
+        if (cpsPathQuery.hasTextFunctionCondition()) {
+            sqlStringBuilder.append(" AND (");
+            sqlStringBuilder.append("attributes @> jsonb_build_object(:textLeafName, :textValue)");
+            sqlStringBuilder
+                .append(" OR attributes @> jsonb_build_object(:textLeafName, json_build_array(:textValue))");
+            queryParameters.put("textLeafName", cpsPathQuery.getTextFunctionConditionLeafName());
+            queryParameters.put("textValue", cpsPathQuery.getTextFunctionConditionValue());
+            final var textValueAsInt = getTextValueAsInt(cpsPathQuery);
+            if (textValueAsInt != null) {
+                sqlStringBuilder.append(" OR attributes @> jsonb_build_object(:textLeafName, :textValueAsInt)");
+                sqlStringBuilder
+                    .append(" OR attributes @> jsonb_build_object(:textLeafName, json_build_array(:textValueAsInt))");
+                queryParameters.put("textValueAsInt", textValueAsInt);
+            }
+            sqlStringBuilder.append(")");
+        }
+    }
+
+    private static void setQueryParameters(final Query query, final Map<String, Object> queryParameters) {
+        for (final Map.Entry<String, Object> queryParameter : queryParameters.entrySet()) {
+            query.setParameter(queryParameter.getKey(), queryParameter.getValue());
+        }
+    }
+
+}