001: /**
002: * Redistribution and use of this software and associated documentation
003: * ("Software"), with or without modification, are permitted provided
004: * that the following conditions are met:
005: *
006: * 1. Redistributions of source code must retain copyright
007: * statements and notices. Redistributions must also contain a
008: * copy of this document.
009: *
010: * 2. Redistributions in binary form must reproduce the
011: * above copyright notice, this list of conditions and the
012: * following disclaimer in the documentation and/or other
013: * materials provided with the distribution.
014: *
015: * 3. The name "Exolab" must not be used to endorse or promote
016: * products derived from this Software without prior written
017: * permission of Intalio, Inc. For written permission,
018: * please contact info@exolab.org.
019: *
020: * 4. Products derived from this Software may not be called "Exolab"
021: * nor may "Exolab" appear in their names without prior written
022: * permission of Intalio, Inc. Exolab is a registered
023: * trademark of Intalio, Inc.
024: *
025: * 5. Due credit should be given to the Exolab Project
026: * (http://www.exolab.org/).
027: *
028: * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
029: * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
030: * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
031: * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
032: * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
033: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
034: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
035: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
036: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
037: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
038: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
039: * OF THE POSSIBILITY OF SUCH DAMAGE.
040: *
041: * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
042: *
043: * $Id: ScopableResolver.java 5951 2006-05-30 22:18:48Z bsnyder $
044: */package org.exolab.castor.xml.schema;
045:
046: import java.util.Hashtable;
047:
048: /**
049: * An implementation of Resolver that can be "scoped". Which means you
050: * can construct a ScopableResovler and give it another Resolver (which
051: * can also be Scopable). If this Resolver cannot "resolve" the id, then
052: * it will try to use the given Resolver to resolver it.
053: * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
054: * @version $Revision: 5951 $ $Date: 2006-04-13 06:47:36 -0600 (Thu, 13 Apr 2006) $
055: **/
056: public class ScopableResolver implements Resolver {
057:
058: private Hashtable ids;
059:
060: private Resolver _resolver = null;
061:
062: public ScopableResolver() {
063: ids = new Hashtable();
064: } //-- ScopableResolver
065:
066: public ScopableResolver(Resolver resolver) {
067: this ();
068: _resolver = resolver;
069: } //-- ScopableResolver
070:
071: /**
072: * Adds a resolvable object to this resolver identified by <tt>id</tt>.
073: * Subsequent calls to {@link #resolve} with the same <tt>id</tt>
074: * will return <tt>referent</tt>.
075: *
076: * @param id The referent's identifier
077: * @param referent The referent object
078: */
079: public void addResolvable(String id, Referable referent) {
080: if (ids.get(id) != null) {
081: //-- handle error
082: }
083: ids.put(id, referent);
084: } //-- register
085:
086: /**
087: * Removes a resolvable object from this resolver. Subsequent calls
088: * to {@link #resolve} with the same <tt>id</tt> will return null.
089: *
090: * @param id The referent's identifier
091: */
092: public void removeResolvable(String id) {
093: Object obj = ids.get(id);
094: if (obj != null) {
095: ids.remove(id);
096: }
097: } //-- removeResolvable
098:
099: public Referable resolve(String id) {
100: Referable referable = (Referable) ids.get(id);
101: if ((referable == null) && (_resolver != null)) {
102: referable = _resolver.resolve(id);
103: }
104: return referable;
105: } //-- resolve
106:
107: } //-- ScopableResolver
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