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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * 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
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package com.sun.org.apache.xerces.internal.dom;

import com.sun.org.apache.xerces.internal.impl.xs.XSImplementationImpl;
import org.w3c.dom.DOMImplementationList;
import org.w3c.dom.DOMImplementation;
import java.util.Vector;

Allows to retrieve XSImplementation, DOM Level 3 Core and LS implementations
and PSVI implementation.
See also the Document Object Model (DOM) Level 3 Core Specification.
Author:
Elena Litani, IBM
@xerces.internal
/**
 * Allows to retrieve <code>XSImplementation</code>, DOM Level 3 Core and LS implementations
 * and PSVI implementation.
 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#DOMImplementationSource'>Document Object Model (DOM) Level 3 Core Specification</a>.
 *
 * @xerces.internal
 *
 * @author Elena Litani, IBM
 */
public class DOMXSImplementationSourceImpl
    extends DOMImplementationSourceImpl {

    
A method to request a DOM implementation.
Params:
features – A string that specifies which features are required.
  This is a space separated list in which each feature is specified
  by its name optionally followed by a space and a version number.
  This is something like: "XML 1.0 Traversal Events 2.0"
Returns:
An implementation that has the desired features, or
  null if this source has none./**
     * A method to request a DOM implementation.
     * @param features A string that specifies which features are required.
     *   This is a space separated list in which each feature is specified
     *   by its name optionally followed by a space and a version number.
     *   This is something like: "XML 1.0 Traversal Events 2.0"
     * @return An implementation that has the desired features, or
     *   <code>null</code> if this source has none.
     */
    public DOMImplementation getDOMImplementation(String features) {
        DOMImplementation impl = super.getDOMImplementation(features);
        if (impl != null){
            return impl;
        }
        // if not try the PSVIDOMImplementation
        impl = PSVIDOMImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            return impl;
        }
        // if not try the XSImplementation
        impl = XSImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            return impl;
        }

        return null;
    }

    
A method to request a list of DOM implementations that support the
specified features and versions, as specified in .
Params:
features – A string that specifies which features and versions
  are required. This is a space separated list in which each feature
  is specified by its name optionally followed by a space and a
  version number. This is something like: "XML 3.0 Traversal +Events
  2.0"
Returns:
A list of DOM implementations that support the desired
  features./**
     * A method to request a list of DOM implementations that support the
     * specified features and versions, as specified in .
     * @param features A string that specifies which features and versions
     *   are required. This is a space separated list in which each feature
     *   is specified by its name optionally followed by a space and a
     *   version number. This is something like: "XML 3.0 Traversal +Events
     *   2.0"
     * @return A list of DOM implementations that support the desired
     *   features.
     */
    public DOMImplementationList getDOMImplementationList(String features) {
        final Vector implementations = new Vector();

        // first check whether the CoreDOMImplementation would do
        DOMImplementationList list = super.getDOMImplementationList(features);
        //Add core DOMImplementations
        for (int i=0; i < list.getLength(); i++ ) {
            implementations.addElement(list.item(i));
        }

        DOMImplementation impl = PSVIDOMImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            implementations.addElement(impl);
        }

        impl = XSImplementationImpl.getDOMImplementation();
        if (testImpl(impl, features)) {
            implementations.addElement(impl);
        }
        return new DOMImplementationListImpl(implementations);
    }
}