Import code from internal repository to git

java/com/google/domain/registry/xjc/XjcObject.java

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+// Copyright 2016 Google Inc. 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.
+
+package com.google.domain.registry.xjc;
+
+import com.google.domain.registry.xml.XmlException;
+
+import java.io.OutputStream;
+import java.io.StringWriter;
+import java.nio.charset.Charset;
+
+import javax.xml.bind.JAXBElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlTransient;
+import javax.xml.namespace.QName;
+
+/** The superclass for XML classes generated by JAXB that provides marshalling and validation. */
+@XmlTransient
+public abstract class XjcObject {
+
+  /**
+   * Validates and streams {@code this} as formatted XML bytes with XML declaration.
+   *
+   * <p>This object must be annotated with {@link javax.xml.bind.annotation.XmlRootElement},
+   * otherwise you should call {@link #toString()}. This method will verify that your object
+   * strictly conforms to the schema defined in {@link XjcXmlTransformer}. Because the output is
+   * streamed, {@link XmlException} will most likely be thrown <i>after</i> output has been written.
+   *
+   * @param out byte-oriented output for writing XML. This method won't close it.
+   * @param encoding should almost always be set to {@code "UTF-8"}.
+   */
+  public void marshal(OutputStream out, Charset encoding) throws XmlException {
+    XjcXmlTransformer.marshalStrict(this, out, encoding);
+  }
+
+  public void marshalLenient(OutputStream out, Charset encoding) throws XmlException {
+    XjcXmlTransformer.marshalLenient(this, out, encoding);
+  }
+
+  /**
+   * Turns object into a formatted XML string <i>by any means necessary</i>.
+   *
+   * <p>No validation is performed and the XML declaration is omitted. If the object can't be
+   * marshalled, a string describing the error is returned.
+   *
+   * @see #marshal
+   */
+  @Override
+  public String toString() {
+    try {
+      StringWriter out = new StringWriter();
+      XjcXmlTransformer.marshalLenient((getClass()
+          .isAnnotationPresent(XmlRootElement.class))
+              ? this
+              : new JAXBElement<>(new QName(getClass().getSimpleName()), Object.class, this), out);
+      return out.toString();
+    } catch (XmlException e) {
+      return String.format("<!-- Invalid XML: %s -->", e.toString());
+    }
+  }
+}