1 files changed, 100 insertions, 0 deletions
diff --git a/app-c/appc/appc-common/src/main/java/org/openecomp/appc/util/PathContext.java b/app-c/appc/appc-common/src/main/java/org/openecomp/appc/util/PathContext.java
new file mode 100644
index 000000000..5565afd2f
--- /dev/null
+++ b/app-c/appc/appc-common/src/main/java/org/openecomp/appc/util/PathContext.java
@@ -0,0 +1,100 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : APP-C
+ * ================================================================================
+ * Copyright (C) 2017 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.openecomp.appc.util;
+
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.Map;
+
+class PathContext {
+
+	private StringBuilder path = new StringBuilder(128);
+
+	private LinkedList<Integer> indexes = new LinkedList<>();
+	private Map<String, String> entries = new LinkedHashMap<>();
+	private int offset = 0;
+
+	private final String delimiter;
+
+	PathContext() {
+		this(".");
+	}
+
+	PathContext(String delimiter) {
+		this.delimiter = delimiter;
+	}
+
+	private void push(String elem, boolean delimit) {
+		if (elem == null) {
+			throw new IllegalArgumentException();
+		}
+
+		int length = elem.length();
+
+		if (delimit && !indexes.isEmpty()) {
+			path.append(delimiter);
+			length += delimiter.length();
+		}
+
+		path.append(elem);
+		offset += length;
+		indexes.addLast(Integer.valueOf(length));
+	}
+
+	private void pop() {
+		if (indexes.isEmpty()) {
+			throw new IllegalStateException();
+		}
+		offset -= indexes.removeLast();
+		path.setLength(offset);
+	}
+
+	void pushToken(String token) {
+		push(token, true);
+	}
+
+	void popToken() {
+		pop();
+	}
+
+	void pushModifier(String modifier) {
+		push(modifier, false);
+	}
+
+	void popModifier() {
+		pop();
+	}
+
+	String getPath() {
+		return path.substring(0, offset);
+	}
+
+	void entry(String name, String value) {
+		entries.put(name, value);
+	}
+
+	Map<String, String> entries() {
+		return Collections.unmodifiableMap(entries);
+	}
+}