Populate xpath/ hierarchy

[yangtools.git] / xpath / yang-xpath-impl / src / main / java / org / opendaylight / yangtools / yang / xpath / impl / Utils.java

diff --git a/xpath/yang-xpath-impl/src/main/java/org/opendaylight/yangtools/yang/xpath/impl/Utils.java b/xpath/yang-xpath-impl/src/main/java/org/opendaylight/yangtools/yang/xpath/impl/Utils.java
new file mode 100644 (file)
index 0000000..74ebb6a
--- /dev/null
+++ b/xpath/yang-xpath-impl/src/main/java/org/opendaylight/yangtools/yang/xpath/impl/Utils.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2019 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.impl;
+
+import javax.xml.xpath.XPathExpressionException;
+import org.eclipse.jdt.annotation.Nullable;
+import org.opendaylight.yangtools.yang.common.AbstractQName;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.common.QNameModule;
+import org.opendaylight.yangtools.yang.common.QualifiedQName;
+import org.opendaylight.yangtools.yang.common.UnqualifiedQName;
+import org.opendaylight.yangtools.yang.common.YangNamespaceContext;
+import org.opendaylight.yangtools.yang.xpath.api.YangLiteralExpr;
+import org.opendaylight.yangtools.yang.xpath.api.YangQNameExpr;
+import org.opendaylight.yangtools.yang.xpath.api.YangQNameExpr.Resolved;
+import org.opendaylight.yangtools.yang.xpath.api.YangQNameExpr.Unresolved;
+
+/**
+ * Various simplistic utilities shared across classes.
+ */
+final class Utils {
+    private Utils() {
+
+    }
+
+    static Unresolved interpretAsQName(final YangLiteralExpr expr) throws XPathExpressionException {
+        final String text = expr.getLiteral();
+        final int colon = text.indexOf(':');
+
+        final AbstractQName qname;
+        try {
+            qname = colon != -1 ? QualifiedQName.of(text.substring(0, colon), text.substring(colon + 1))
+                    : UnqualifiedQName.of(text);
+        } catch (IllegalArgumentException e) {
+            throw wrapException(e, "Cannot interpret %s as a QName", expr);
+        }
+
+        return YangQNameExpr.of(qname.intern());
+    }
+
+    static YangQNameExpr interpretAsQName(final YangNamespaceContext namespaceContext, final YangLiteralExpr expr)
+            throws XPathExpressionException {
+        final String text = expr.getLiteral();
+        final int colon = text.indexOf(':');
+        try {
+            if (colon == -1) {
+                return YangQNameExpr.of(UnqualifiedQName.of(text).intern());
+            }
+
+            return YangQNameExpr.of(namespaceContext.createQName(text.substring(0, colon), text.substring(colon + 1)));
+        } catch (IllegalArgumentException e) {
+            throw wrapException(e, "Cannot interpret %s as a QName", expr);
+        }
+    }
+
+    static Resolved interpretAsQName(final YangNamespaceContext namespaceContext,
+            final QNameModule defaultNamespace, final YangLiteralExpr expr) throws XPathExpressionException {
+        final String text = expr.getLiteral();
+        final int colon = text.indexOf(':');
+        final QName qname;
+
+        try {
+            qname = colon == -1 ? QName.create(defaultNamespace, text).intern()
+                    : namespaceContext.createQName(text.substring(0, colon), text.substring(colon + 1));
+        } catch (IllegalArgumentException e) {
+            throw wrapException(e, "Cannot interpret %s as a QName", expr);
+        }
+
+        return YangQNameExpr.of(qname);
+    }
+
+    static XPathExpressionException wrapException(final @Nullable Throwable cause, final String format,
+            final Object... args) {
+        final XPathExpressionException ret = new XPathExpressionException(String.format(format, args));
+        ret.initCause(cause);
+        return ret;
+    }
+}