https://xerces.apache.org/xerces2-j/: Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use. 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * 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.
 */
package org.apache.xerces.util;

import java.io.InputStream;
import java.io.Reader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.apache.xerces.xni.XMLResourceIdentifier;
import org.apache.xerces.xni.parser.XMLInputSource;


This class represents an input source for an XML resource
retrievable over HTTP. In addition to the properties
provided by an XMLInputSource an HTTP input
source also has HTTP request properties and a preference
whether HTTP redirects will be followed. Note that these
properties will only be used if reading this input source
will induce an HTTP connection.

Author:Michael Glavassevich, IBM
Version:$Id: HTTPInputSource.java 699892 2008-09-28 21:08:27Z mrglavas $
/**
 * This class represents an input source for an XML resource
 * retrievable over HTTP. In addition to the properties
 * provided by an <code>XMLInputSource</code> an HTTP input
 * source also has HTTP request properties and a preference
 * whether HTTP redirects will be followed. Note that these
 * properties will only be used if reading this input source
 * will induce an HTTP connection.
 * 
 * @author Michael Glavassevich, IBM
 * 
 * @version $Id: HTTPInputSource.java 699892 2008-09-28 21:08:27Z mrglavas $
 */
public final class HTTPInputSource extends XMLInputSource {

    //
    // Data
    //
    
    
Preference for whether HTTP redirects should be followed. 
/** Preference for whether HTTP redirects should be followed. **/
    protected boolean fFollowRedirects = true;
    
    
HTTP request properties. 
/** HTTP request properties. **/
    protected Map fHTTPRequestProperties = new HashMap();
    
    //
    // Constructors
    //
    
    
Constructs an input source from just the public and system
identifiers, leaving resolution of the entity and opening of
the input stream up to the caller.

Params:
  • publicId –     The public identifier, if known.
  • systemId –     The system identifier. This value should
                    always be set, if possible, and can be
                    relative or absolute. If the system identifier
                    is relative, then the base system identifier
                    should be set.
  • baseSystemId – The base system identifier. This value should
                    always be set to the fully expanded URI of the
                    base system identifier, if possible.
/** 
     * Constructs an input source from just the public and system
     * identifiers, leaving resolution of the entity and opening of
     * the input stream up to the caller.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     */
    public HTTPInputSource(String publicId, String systemId, String baseSystemId) {
        super(publicId, systemId, baseSystemId);
    } // <init>(String,String,String)
    
    
Constructs an input source from a XMLResourceIdentifier
object, leaving resolution of the entity and opening of
the input stream up to the caller.

Params:
  • resourceIdentifier – the XMLResourceIdentifier containing the information
/** 
     * Constructs an input source from a XMLResourceIdentifier
     * object, leaving resolution of the entity and opening of
     * the input stream up to the caller.
     *
     * @param resourceIdentifier the XMLResourceIdentifier containing the information
     */
    public HTTPInputSource(XMLResourceIdentifier resourceIdentifier) {
        super(resourceIdentifier);
    } // <init>(XMLResourceIdentifier)
    
    
Constructs an input source from a byte stream.

Params:
  • publicId –     The public identifier, if known.
  • systemId –     The system identifier. This value should
                    always be set, if possible, and can be
                    relative or absolute. If the system identifier
                    is relative, then the base system identifier
                    should be set.
  • baseSystemId – The base system identifier. This value should
                    always be set to the fully expanded URI of the
                    base system identifier, if possible.
  • byteStream –   The byte stream.
  • encoding –     The encoding of the byte stream, if known.
/**
     * Constructs an input source from a byte stream.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     * @param byteStream   The byte stream.
     * @param encoding     The encoding of the byte stream, if known.
     */
    public HTTPInputSource(String publicId, String systemId,
            String baseSystemId, InputStream byteStream, String encoding) {
        super(publicId, systemId, baseSystemId, byteStream, encoding);
    } // <init>(String,String,String,InputStream,String)
    
    
Constructs an input source from a character stream.

Params:
  • publicId –     The public identifier, if known.
  • systemId –     The system identifier. This value should
                    always be set, if possible, and can be
                    relative or absolute. If the system identifier
                    is relative, then the base system identifier
                    should be set.
  • baseSystemId – The base system identifier. This value should
                    always be set to the fully expanded URI of the
                    base system identifier, if possible.
  • charStream –   The character stream.
  • encoding –     The original encoding of the byte stream
                    used by the reader, if known.
/**
     * Constructs an input source from a character stream.
     *
     * @param publicId     The public identifier, if known.
     * @param systemId     The system identifier. This value should
     *                     always be set, if possible, and can be
     *                     relative or absolute. If the system identifier
     *                     is relative, then the base system identifier
     *                     should be set.
     * @param baseSystemId The base system identifier. This value should
     *                     always be set to the fully expanded URI of the
     *                     base system identifier, if possible.
     * @param charStream   The character stream.
     * @param encoding     The original encoding of the byte stream
     *                     used by the reader, if known.
     */
    public HTTPInputSource(String publicId, String systemId,
            String baseSystemId, Reader charStream, String encoding) {
        super(publicId, systemId, baseSystemId, charStream, encoding);
    } // <init>(String,String,String,Reader,String)
    
    //
    // Public methods
    //   
    
    
Returns the preference whether HTTP redirects should
be followed. By default HTTP redirects will be followed.

/**
     * Returns the preference whether HTTP redirects should
     * be followed. By default HTTP redirects will be followed.
     */
    public boolean getFollowHTTPRedirects() {
        return fFollowRedirects;
    } // getFollowHTTPRedirects():boolean
    
    
    
Sets the preference whether HTTP redirects should
be followed. By default HTTP redirects will be followed.

/**
     * Sets the preference whether HTTP redirects should
     * be followed. By default HTTP redirects will be followed.
     */
    public void setFollowHTTPRedirects(boolean followRedirects) {
        fFollowRedirects = followRedirects;
    } // setFollowHTTPRedirects(boolean)
    
    
Returns the value of the request property 
associated with the given property name.

Params:
  • key – the name of the request property
Returns:the value of the request property or 
null if this property has not
been set
/**
     * Returns the value of the request property 
     * associated with the given property name.
     * 
     * @param key the name of the request property
     * @return the value of the request property or 
     * <code>null</code> if this property has not
     * been set
     */
    public String getHTTPRequestProperty(String key) {
        return (String) fHTTPRequestProperties.get(key);
    } // getHTTPRequestProperty(String):String
    
    
Returns an iterator for the request properties this
input source contains. Each object returned by the
iterator is an instance of java.util.Map.Entry
where each key and value are a pair of strings corresponding
to the name and value of a request property. 

Returns:an iterator for the request properties this
input source contains
/**
     * Returns an iterator for the request properties this
     * input source contains. Each object returned by the
     * iterator is an instance of <code>java.util.Map.Entry</code>
     * where each key and value are a pair of strings corresponding
     * to the name and value of a request property. 
     * 
     * @return an iterator for the request properties this
     * input source contains
     */
    public Iterator getHTTPRequestProperties() {
        return fHTTPRequestProperties.entrySet().iterator();
    } // getHTTPRequestProperties():Iterator
    
    
Sets the value of the request property
associated with the given property name.

Params:
  • key – the name of the request property
  • value – the value of the request property
/**
     * Sets the value of the request property
     * associated with the given property name.
     * 
     * @param key the name of the request property
     * @param value the value of the request property
     */
    public void setHTTPRequestProperty(String key, String value) {
        if (value != null) {
            fHTTPRequestProperties.put(key, value);
        }
        else {
            fHTTPRequestProperties.remove(key);
        }
    } // setHTTPRequestProperty(String,String)
    
} // class HTTPInputSource