/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/*
 * $Id: DOMCryptoContext.java,v 1.3 2005/05/09 18:33:26 mullan Exp $
 */
package javax.xml.crypto.dom;

import javax.xml.crypto.KeySelector;
import javax.xml.crypto.URIDereferencer;
import javax.xml.crypto.XMLCryptoContext;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import org.w3c.dom.Element;

This class provides a DOM-specific implementation of the XMLCryptoContext interface. It also includes additional methods that are specific to a DOM-based implementation for registering and retrieving elements that contain attributes of type ID. 
Author:
Sean Mullan, JSR 105 Expert Group
Since:
1.6/**
 * This class provides a DOM-specific implementation of the
 * {@link XMLCryptoContext} interface. It also includes additional
 * methods that are specific to a DOM-based implementation for registering
 * and retrieving elements that contain attributes of type ID.
 *
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 * @since 1.6
 */
public class DOMCryptoContext implements XMLCryptoContext {

    private HashMap nsMap = new HashMap();
    private HashMap idMap = new HashMap();
    private HashMap objMap = new HashMap();
    private String baseURI;
    private KeySelector ks;
    private URIDereferencer dereferencer;
    private HashMap propMap = new HashMap();
    private String defaultPrefix;

    
Default constructor. (For invocation by subclass constructors).
/**
     * Default constructor. (For invocation by subclass constructors).
     */
    protected DOMCryptoContext() {}

    
This implementation uses an internal HashMap to get the prefix that the specified URI maps to. It returns the defaultPrefix
if it maps to null.
Throws:
NullPointerException – {@inheritDoc}/**
     * This implementation uses an internal {@link HashMap} to get the prefix
     * that the specified URI maps to. It returns the <code>defaultPrefix</code>
     * if it maps to <code>null</code>.
     *
     * @throws NullPointerException {@inheritDoc}
     */
    public String getNamespacePrefix(String namespaceURI,
        String defaultPrefix) {
        if (namespaceURI == null) {
            throw new NullPointerException("namespaceURI cannot be null");
        }
        String prefix = (String) nsMap.get(namespaceURI);
        return (prefix != null ? prefix : defaultPrefix);
    }

    
This implementation uses an internal HashMap to map the URI to the specified prefix. 
Throws:
NullPointerException – {@inheritDoc}/**
     * This implementation uses an internal {@link HashMap} to map the URI
     * to the specified prefix.
     *
     * @throws NullPointerException {@inheritDoc}
     */
    public String putNamespacePrefix(String namespaceURI, String prefix) {
        if (namespaceURI == null) {
            throw new NullPointerException("namespaceURI is null");
        }
        return (String) nsMap.put(namespaceURI, prefix);
    }

    public String getDefaultNamespacePrefix() {
        return defaultPrefix;
    }

    public void setDefaultNamespacePrefix(String defaultPrefix) {
        this.defaultPrefix = defaultPrefix;
    }

    public String getBaseURI() {
        return baseURI;
    }

    
Throws:
IllegalArgumentException – {@inheritDoc}/**
     * @throws IllegalArgumentException {@inheritDoc}
     */
    public void setBaseURI(String baseURI) {
        if (baseURI != null) {
            java.net.URI.create(baseURI);
        }
        this.baseURI = baseURI;
    }

    public URIDereferencer getURIDereferencer() {
        return dereferencer;
    }

    public void setURIDereferencer(URIDereferencer dereferencer) {
        this.dereferencer = dereferencer;
    }

    
This implementation uses an internal HashMap to get the object that the specified name maps to. 
Throws:
NullPointerException – {@inheritDoc}/**
     * This implementation uses an internal {@link HashMap} to get the object
     * that the specified name maps to.
     *
     * @throws NullPointerException {@inheritDoc}
     */
    public Object getProperty(String name) {
        if (name == null) {
            throw new NullPointerException("name is null");
        }
        return propMap.get(name);
    }

    
This implementation uses an internal HashMap to map the name to the specified object. 
Throws:
NullPointerException – {@inheritDoc}/**
     * This implementation uses an internal {@link HashMap} to map the name
     * to the specified object.
     *
     * @throws NullPointerException {@inheritDoc}
     */
    public Object setProperty(String name, Object value) {
        if (name == null) {
            throw new NullPointerException("name is null");
        }
        return propMap.put(name, value);
    }

    public KeySelector getKeySelector() {
        return ks;
    }

    public void setKeySelector(KeySelector ks) {
        this.ks = ks;
    }

    
Returns the Element with the specified ID attribute value.
This implementation uses an internal HashMap to get the element that the specified attribute value maps to. 
Params:
idValue – the value of the ID
Throws:
NullPointerException – if idValue is null
See Also:
setIdAttributeNS
Returns:
the Element with the specified ID attribute value,
   or null if none./**
     * Returns the <code>Element</code> with the specified ID attribute value.
     *
     * <p>This implementation uses an internal {@link HashMap} to get the
     * element that the specified attribute value maps to.
     *
     * @param idValue the value of the ID
     * @return the <code>Element</code> with the specified ID attribute value,
     *    or <code>null</code> if none.
     * @throws NullPointerException if <code>idValue</code> is <code>null</code>
     * @see #setIdAttributeNS
     */
    public Element getElementById(String idValue) {
        if (idValue == null) {
            throw new NullPointerException("idValue is null");
        }
        return (Element) idMap.get(idValue);
    }

    
Registers the element's attribute specified by the namespace URI and
local name to be of type ID. The attribute must have a non-empty value.
This implementation uses an internal HashMap to map the attribute's value to the specified element. 
Params:
element – the element
namespaceURI – the namespace URI of the attribute (specify
   null if not applicable)
localName – the local name of the attribute
Throws:
IllegalArgumentException – if localName is not an
   attribute of the specified element or it does not contain a specific
   value
NullPointerException – if element or
   localName is null
See Also:
getElementById/**
     * Registers the element's attribute specified by the namespace URI and
     * local name to be of type ID. The attribute must have a non-empty value.
     *
     * <p>This implementation uses an internal {@link HashMap} to map the
     * attribute's value to the specified element.
     *
     * @param element the element
     * @param namespaceURI the namespace URI of the attribute (specify
     *    <code>null</code> if not applicable)
     * @param localName the local name of the attribute
     * @throws IllegalArgumentException if <code>localName</code> is not an
     *    attribute of the specified element or it does not contain a specific
     *    value
     * @throws NullPointerException if <code>element</code> or
     *    <code>localName</code> is <code>null</code>
     * @see #getElementById
     */
    public void setIdAttributeNS(Element element, String namespaceURI,
        String localName) {
        if (element == null) {
            throw new NullPointerException("element is null");
        }
        if (localName == null) {
            throw new NullPointerException("localName is null");
        }
        String idValue = element.getAttributeNS(namespaceURI, localName);
        if (idValue == null || idValue.length() == 0) {
            throw new IllegalArgumentException(localName + " is not an " +
                "attribute");
        }
        idMap.put(idValue, element);
    }

    
Returns a read-only iterator over the set of Id/Element mappings of
this DOMCryptoContext. Attempts to modify the set via the Iterator.remove method throw an UnsupportedOperationException. The mappings are returned in no particular order. Each element in the iteration is represented as a Entry. If the DOMCryptoContext is
modified while an iteration is in progress, the results of the
iteration are undefined.
Returns:
a read-only iterator over the set of mappings/**
     * Returns a read-only iterator over the set of Id/Element mappings of
     * this <code>DOMCryptoContext</code>. Attempts to modify the set via the
     * {@link Iterator#remove} method throw an
     * <code>UnsupportedOperationException</code>. The mappings are returned
     * in no particular order. Each element in the iteration is represented as a
     * {@link java.util.Map.Entry}. If the <code>DOMCryptoContext</code> is
     * modified while an iteration is in progress, the results of the
     * iteration are undefined.
     *
     * @return a read-only iterator over the set of mappings
     */
    public Iterator iterator() {
        return Collections.unmodifiableMap(idMap).entrySet().iterator();
    }

    
This implementation uses an internal HashMap to get the object that the specified key maps to. /**
     * This implementation uses an internal {@link HashMap} to get the object
     * that the specified key maps to.
     */
    public Object get(Object key) {
        return objMap.get(key);
    }

    
This implementation uses an internal HashMap to map the key to the specified object. 
Throws:
IllegalArgumentException – {@inheritDoc}/**
     * This implementation uses an internal {@link HashMap} to map the key
     * to the specified object.
     *
     * @throws IllegalArgumentException {@inheritDoc}
     */
    public Object put(Object key, Object value) {
        return objMap.put(key, value);
    }
}