001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package com.sun.rave.propertyeditors.binding;
043:
044: import java.io.BufferedReader;
045: import java.io.InputStreamReader;
046: import java.net.URL;
047: import java.util.Enumeration;
048:
049: /**
050: * A global registry for implementations of {@link DataBindingHelper}. The IDE
051: * will provide an implementation at design-time.
052: */
053: public class DataBindingHelperRegistry {
054:
055: private static DataBindingHelper DATA_BINDING_HELPER;
056:
057: public static void setDataBindingHelper(
058: DataBindingHelper dataBindingHelper) {
059: DATA_BINDING_HELPER = dataBindingHelper;
060: }
061:
062: public static DataBindingHelper getDataBindingHelper() {
063: return DATA_BINDING_HELPER;
064: }
065:
066: private static DataBindingHelper findDataBindingHelper(
067: ClassLoader classLoader) {
068: try {
069: String interfaceName = "META-INF/services/"
070: + DataBindingHelper.class.getName(); // NOI18N
071: Enumeration<URL> urls = classLoader
072: .getResources(interfaceName);
073: Class dataBindingHelperClass = null;
074: while (dataBindingHelperClass == null
075: && urls.hasMoreElements()) {
076: URL url = urls.nextElement();
077: try {
078: BufferedReader reader = new BufferedReader(
079: new InputStreamReader(url.openStream(),
080: "UTF-8")); // NOI18N
081: String content = reader.readLine();
082: if (content != null) {
083: content = content.trim();
084: dataBindingHelperClass = Class.forName(content,
085: false, classLoader);
086: if (!DataBindingHelper.class
087: .isAssignableFrom(dataBindingHelperClass)) {
088: throw new ClassNotFoundException(
089: dataBindingHelperClass.getName()
090: + " is not a subclass of "
091: + DataBindingHelper.class
092: .getName()); // NOI18N
093: }
094: }
095: } catch (Exception e) {
096: e.printStackTrace();
097: dataBindingHelperClass = null;
098: }
099: }
100: if (dataBindingHelperClass != null) {
101: DataBindingHelper dataBindingHelper = (DataBindingHelper) dataBindingHelperClass
102: .newInstance();
103: return dataBindingHelper;
104: }
105: } catch (Exception e) {
106: e.printStackTrace();
107: }
108: System.err.println("No implementation of "
109: + DataBindingHelper.class.getName() + " found.");
110: return null;
111: }
112:
113: }
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