1 files changed, 76 insertions, 0 deletions
diff --git a/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java b/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java
new file mode 100644
index 000000000..4fcf6e444
--- /dev/null
+++ b/cps-ri/src/main/java/org/onap/cps/spi/query/CpsPathQuery.java
@@ -0,0 +1,76 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation
+ *  Modifications Copyright (C) 2021 Bell Canada. 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.cps.spi.query;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.Setter;
+import org.onap.cps.spi.exceptions.CpsPathException;
+
+@Getter
+@Setter(AccessLevel.PRIVATE)
+public class CpsPathQuery {
+
+    private String xpathPrefix;
+    private String leafName;
+    private Object leafValue;
+
+    public static final Pattern QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN =
+        Pattern.compile("(.*)\\[\\s*@(.*?)\\s*=\\s*(.*?)\\s*]");
+
+    public static final Pattern LEAF_STRING_VALUE_PATTERN = Pattern.compile("['\"](.*)['\"]");
+
+    public static final Pattern LEAF_INTEGER_VALUE_PATTERN = Pattern.compile("[-+]?\\d+");
+
+    /**
+     * Returns a xpath prefix, leaf name and leaf value for the given cps path.
+     *
+     * @param cpsPath cps path
+     * @return a CpsPath object containing the xpath prefix, leaf name and leaf value.
+     */
+    public static CpsPathQuery createFrom(final String cpsPath) {
+        final Matcher matcher = QUERY_CPS_PATH_WITH_SINGLE_LEAF_PATTERN.matcher(cpsPath);
+        if (matcher.matches()) {
+            final CpsPathQuery cpsPathQuery = new CpsPathQuery();
+            cpsPathQuery.setXpathPrefix(matcher.group(1));
+            cpsPathQuery.setLeafName(matcher.group(2));
+            cpsPathQuery.setLeafValue(convertLeafValueToCorrectType(matcher.group(3)));
+            return cpsPathQuery;
+        }
+        throw new CpsPathException("Invalid cps path.",
+            String.format("Cannot interpret or parse cps path %s.", cpsPath));
+    }
+
+    private static Object convertLeafValueToCorrectType(final String leafValueString) {
+        final Matcher stringValueWithQuotesMatcher = LEAF_STRING_VALUE_PATTERN.matcher(leafValueString);
+        if (stringValueWithQuotesMatcher.matches()) {
+            return stringValueWithQuotesMatcher.group(1);
+        }
+        final Matcher integerValueMatcher = LEAF_INTEGER_VALUE_PATTERN.matcher(leafValueString);
+        if (integerValueMatcher.matches()) {
+            return Integer.valueOf(leafValueString);
+        }
+        throw new CpsPathException("Unsupported leaf value.",
+            String.format("Unsupported leaf value %s in cps path.", leafValueString));
+    }
+}