cdataproperty.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 235 行

/*
 * Copyright (c) 1998-2007 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Emil Ong, Adam Megacz
 */

package com.caucho.jaxb.property;

import java.io.IOException;

import java.util.ArrayList;

import static javax.xml.XMLConstants.*;

import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.UnmarshalException;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

import com.caucho.jaxb.BinderImpl;
import com.caucho.jaxb.JAXBUtil;
import com.caucho.jaxb.NodeIterator;
import com.caucho.jaxb.mapping.Namer;
import com.caucho.jaxb.mapping.XmlMapping;
import com.caucho.jaxb.skeleton.ClassSkeleton;
import com.caucho.util.L10N;
import com.caucho.xml.stream.StaxUtil;


/**
 * helper class for properties that are represented as a "flat" CDATA block
 */
public abstract class CDataProperty extends Property {
  public static final L10N L = new L10N(CDataProperty.class);

  protected boolean _isNullable = true;

  protected abstract Object read(String in) 
    throws IOException, JAXBException;

  public String getMinOccurs()
  {
    if (_isNullable)
      return "0";

    return null;
  }

  public Object readAttribute(XMLStreamReader in, int i)
    throws IOException, JAXBException
  {
    return read(in.getAttributeValue(i));
  }

  public Object read(Unmarshaller u, XMLStreamReader in, Object previous)
    throws IOException, XMLStreamException, JAXBException
  {
    return read(u, in, previous, null, null);
  }

  public Object read(Unmarshaller u, XMLStreamReader in, Object previous, 
                     ClassSkeleton attributed, Object parent)
    throws IOException, XMLStreamException, JAXBException
  {
    // Read any attributes that might represent fields in the parent object.
    // Necessary for situations in which the read object has an XmlValue,
    // but also has XmlAttributes.
    if (attributed != null) {
      for (int i = 0; i < in.getAttributeCount(); i++) {
        QName attributeName = in.getAttributeName(i);
        XmlMapping mapping = attributed.getAttributeMapping(attributeName);

        if (mapping == null)
          throw new UnmarshalException(L.l("Attribute {0} not found in {1}", 
                                           attributeName, 
                                           attributed.getType()));

        mapping.readAttribute(in, i, parent);
      }
    }

    // Now read the actual value of the CData
    in.next();

    Object ret = null;

    if (in.getEventType() == in.CHARACTERS) {
      ret = read(in.getText());

      // essentially a nextTag() that handles end of document gracefully
      while (in.hasNext()) {
        in.next();

        if (in.getEventType() == in.END_ELEMENT)
          break;
      }
    }
    else {
      String nil = in.getAttributeValue(W3C_XML_SCHEMA_INSTANCE_NS_URI, "nil");

      if ("true".equals(nil)) // XXX nillable?
        ret = getNilValue();

      else
        ret = read(""); // Hack when we have something like <tag></tag>
    }

    while (in.hasNext()) {
      in.next();

      if (in.getEventType() == in.START_ELEMENT || 
          in.getEventType() == in.END_ELEMENT)
        break;
    }

    return ret;
  }

  public Object bindFrom(BinderImpl binder, NodeIterator node, Object previous)
    throws IOException, JAXBException
  {
    Node root = node.getNode();

    Object ret = read(root.getTextContent());

    binder.bind(ret, root);

    return ret;
  }

  public abstract String write(Object in)
    throws IOException, JAXBException;

  public void write(Marshaller m, XMLStreamWriter out, Object value, 
                    Namer namer, Object obj, 
                    ArrayList<XmlMapping> attributes)
    throws IOException, XMLStreamException, JAXBException
  {
    // This checks if obj != null (as opposed to value != null) because we 
    // may actually want to write something if the value is null.  For example,
    // we may write an xsi:nil="true".
    if (obj != null) {
      QName qname = namer.getQName(value);

      if (attributes != null || value != null)
        StaxUtil.writeStartElement(out, qname);

      if (attributes != null) {
        for (int i = 0; i < attributes.size(); i++) {
          attributes.get(i).write(m, out, obj);
        }
      }

      if (attributes != null || value != null) {
        out.writeCharacters(write(value));
        StaxUtil.writeEndElement(out, qname);
      }
    }
  }

  public void write(Marshaller m, XMLStreamWriter out, 
                    Object value, Namer namer)
    throws IOException, XMLStreamException, JAXBException
  {
    write(m, out, value, namer, null);
  }

  public void write(Marshaller m, XMLStreamWriter out, Object value,
                    Namer namer, Object obj)
    throws IOException, XMLStreamException, JAXBException
  {
    if (value != null) {
      QName qname = namer.getQName(value);

      StaxUtil.writeStartElement(out, qname);
      out.writeCharacters(write(value));
      StaxUtil.writeEndElement(out, qname);
    }
  }

  public Node bindTo(BinderImpl binder, Node node, 
                     Object value, Namer namer)
    throws IOException, JAXBException
  {
    QName qname = namer.getQName(value);
    QName name = JAXBUtil.qnameFromNode(node);

    if (! name.equals(qname)) {
      Document doc = node.getOwnerDocument(); 
      node = JAXBUtil.elementFromQName(qname, doc);
    }

    node.setTextContent(write(value));

    binder.bind(value, node);

    return node;
  }

  public String toString()
  {
    return this.getClass().getSimpleName();
  }
}