Add yang-xpath-api

[yangtools.git] / yang / yang-xpath-api / src / main / java / org / opendaylight / yangtools / yang / xpath / api / YangPathExpr.java

diff --git a/yang/yang-xpath-api/src/main/java/org/opendaylight/yangtools/yang/xpath/api/YangPathExpr.java b/yang/yang-xpath-api/src/main/java/org/opendaylight/yangtools/yang/xpath/api/YangPathExpr.java
new file mode 100644 (file)
index 0000000..d695d2e
--- /dev/null
+++ b/yang/yang-xpath-api/src/main/java/org/opendaylight/yangtools/yang/xpath/api/YangPathExpr.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2018 Pantheon Technologies, s.r.o.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.xpath.api;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.annotations.Beta;
+import java.util.Objects;
+import java.util.Optional;
+import org.eclipse.jdt.annotation.Nullable;
+
+@Beta
+public class YangPathExpr implements YangExpr {
+    private static final class WithLocation extends YangPathExpr {
+        private static final long serialVersionUID = 1L;
+
+        private final YangLocationPath locationPath;
+
+        WithLocation(final YangExpr filterExpr, final YangLocationPath locationPath) {
+            super(filterExpr);
+            this.locationPath = requireNonNull(locationPath);
+        }
+
+        @Override
+        public Optional<YangLocationPath> getLocationPath() {
+            return Optional.of(locationPath);
+        }
+    }
+
+    private static final long serialVersionUID = 1L;
+
+    private final YangExpr filterExpr;
+
+    YangPathExpr(final YangExpr filterExpr) {
+        this.filterExpr = requireNonNull(filterExpr);
+    }
+
+    public static YangPathExpr of(final YangExpr filterExpr) {
+        return new YangPathExpr(filterExpr);
+    }
+
+    public static YangExpr of(final YangExpr expr, final YangLocationPath locationPath) {
+        return new WithLocation(expr, locationPath);
+    }
+
+    public final YangExpr getFilterExpr() {
+        return filterExpr;
+    }
+
+    public Optional<YangLocationPath> getLocationPath() {
+        return Optional.empty();
+    }
+
+    @Override
+    public final int hashCode() {
+        return Objects.hash(filterExpr, getLocationPath());
+    }
+
+    @Override
+    public final boolean equals(final @Nullable Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof YangPathExpr)) {
+            return false;
+        }
+        final YangPathExpr other = (YangPathExpr) obj;
+        return filterExpr.equals(((YangPathExpr) obj).filterExpr) && getLocationPath().equals(other.getLocationPath());
+    }
+
+    @Override
+    public final String toString() {
+        // FIXME: this is not right
+        return "-(" + filterExpr + ")";
+    }
+}