SecurityBase.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  The ASF licenses this file to You
* 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.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.security.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.abdera.model.Document;
import org.apache.abdera.model.Element;
import org.apache.abdera.security.SecurityOptions;
import org.apache.xml.serialize.Serializer;
import org.apache.xml.serialize.XMLSerializer;


public abstract class SecurityBase {
  
  protected org.w3c.dom.Document fomToDom(
    Document doc, 
    SecurityOptions options) {
    org.w3c.dom.Document dom = null;
    if (doc != null) {
      try {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        doc.writeTo(out);
        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setValidating(false);
        dbf.setNamespaceAware(true);
        DocumentBuilder db = dbf.newDocumentBuilder();
        dom = db.parse(in);
      } catch (Exception e) {}
    } 
    return dom;
  }
  
  protected Document domToFom(
    org.w3c.dom.Document dom, 
    SecurityOptions options) {
      Document doc = null;
      if (dom != null) {
        try {
          Serializer ser = new XMLSerializer();
          ByteArrayOutputStream out = new ByteArrayOutputStream();
          ser.setOutputByteStream(out);
          ser.asDOMSerializer().serialize(dom);
          ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
          doc = options.getParser().parse(in);
        } catch (Exception e) {}
      }
      return doc;
  }
  
  protected org.w3c.dom.Element fomToDom(
    Element element, 
    SecurityOptions options) {
    org.w3c.dom.Element dom = null;
    if (element != null) {
      try {
        ByteArrayInputStream in = new ByteArrayInputStream(element.toString().getBytes());
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setValidating(false);
        dbf.setNamespaceAware(true);
        DocumentBuilder db = dbf.newDocumentBuilder();
        dom = db.parse(in).getDocumentElement();
      } catch (Exception e) {}
    } 
    return dom;
  }
  
  protected Element domToFom(
    org.w3c.dom.Element element, 
    SecurityOptions options) {
    Element el = null;
    if (element != null) {
      try {
        Serializer ser = new XMLSerializer();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ser.setOutputByteStream(out);
        ser.asDOMSerializer().serialize(element);
        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
        el = options.getParser().parse(in).getRoot();
      } catch (Exception e) {}
    }
    return el;
  }
}