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package com.sun.org.apache.xerces.internal.dom;

import java.util.StringTokenizer;
import java.util.Vector;
import org.w3c.dom.DOMImplementationList;
import org.w3c.dom.DOMImplementationSource;
import org.w3c.dom.DOMImplementation;
import com.sun.org.apache.xerces.internal.dom.DOMImplementationListImpl;

Supply one the right implementation, based upon requested features. Each implemented DOMImplementationSource object is listed in the binding-specific list of available sources so that its DOMImplementation objects are made available.

See also the Document Object Model (DOM) Level 3 Core Specification.

@xerces.internal
/** * Supply one the right implementation, based upon requested features. Each * implemented <code>DOMImplementationSource</code> object is listed in the * binding-specific list of available sources so that its * <code>DOMImplementation</code> objects are made available. * * <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 * */
public class DOMImplementationSourceImpl implements DOMImplementationSource {
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) { // first check whether the CoreDOMImplementation would do DOMImplementation impl = CoreDOMImplementationImpl.getDOMImplementation(); if (testImpl(impl, features)) { return impl; } // if not try the DOMImplementation impl = DOMImplementationImpl.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) { // first check whether the CoreDOMImplementation would do DOMImplementation impl = CoreDOMImplementationImpl.getDOMImplementation(); final Vector implementations = new Vector(); if (testImpl(impl, features)) { implementations.addElement(impl); } impl = DOMImplementationImpl.getDOMImplementation(); if (testImpl(impl, features)) { implementations.addElement(impl); } return new DOMImplementationListImpl(implementations); } boolean testImpl(DOMImplementation impl, String features) { StringTokenizer st = new StringTokenizer(features); String feature = null; String version = null; if (st.hasMoreTokens()) { feature = st.nextToken(); } while (feature != null) { boolean isVersion = false; if (st.hasMoreTokens()) { char c; version = st.nextToken(); c = version.charAt(0); switch (c) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': isVersion = true; } } else { version = null; } if (isVersion) { if (!impl.hasFeature(feature, version)) { return false; } if (st.hasMoreTokens()) { feature = st.nextToken(); } else { feature = null; } } else { if (!impl.hasFeature(feature, null)) { return false; } feature = version; } } return true; } }