Source Code Cross Referenced for FactoryFinder.java in  » Scripting » JUEL » javax » el » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » JUEL » javax.el 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The contents of this file are subject to the terms
003:         * of the Common Development and Distribution License
004:         * (the "License").  You may not use this file except
005:         * in compliance with the License.
006:         *
007:         * You can obtain a copy of the license at
008:         * glassfish/bootstrap/legal/CDDLv1.0.txt or
009:         * https://glassfish.dev.java.net/public/CDDLv1.0.html.
010:         * See the License for the specific language governing
011:         * permissions and limitations under the License.
012:         *
013:         * When distributing Covered Code, include this CDDL
014:         * HEADER in each file and include the License file at
015:         * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable,
016:         * add the following below this CDDL HEADER, with the
017:         * fields enclosed by brackets "[]" replaced with your
018:         * own identifying information: Portions Copyright [yyyy]
019:         * [name of copyright owner]
020:         *
021:         * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
022:         */
023:
024:        package javax.el;
025:
026:        import java.lang.reflect.Constructor;
027:        import java.io.InputStream;
028:        import java.io.File;
029:        import java.io.FileInputStream;
030:        import java.util.Properties;
031:        import java.io.BufferedReader;
032:        import java.io.InputStreamReader;
033:
034:        class FactoryFinder {
035:
036:            /**
037:             * Creates an instance of the specified class using the specified 
038:             * <code>ClassLoader</code> object.
039:             *
040:             * @exception ELException if the given class could not be found
041:             *            or could not be instantiated
042:             */
043:            private static Object newInstance(String className,
044:                    ClassLoader classLoader, Properties properties) {
045:                try {
046:                    Class spiClass;
047:                    if (classLoader == null) {
048:                        spiClass = Class.forName(className);
049:                    } else {
050:                        spiClass = classLoader.loadClass(className);
051:                    }
052:                    if (properties != null) {
053:                        Constructor constr = null;
054:                        try {
055:                            constr = spiClass.getConstructor(Properties.class);
056:                        } catch (Exception ex) {
057:                        }
058:                        if (constr != null) {
059:                            return constr.newInstance(properties);
060:                        }
061:                    }
062:                    return spiClass.newInstance();
063:                } catch (ClassNotFoundException x) {
064:                    throw new ELException("Provider " + className
065:                            + " not found", x);
066:                } catch (Exception x) {
067:                    throw new ELException("Provider " + className
068:                            + " could not be instantiated: " + x, x);
069:                }
070:            }
071:
072:            /**
073:             * Finds the implementation <code>Class</code> object for the given
074:             * factory name, or if that fails, finds the <code>Class</code> object
075:             * for the given fallback class name. The arguments supplied must be
076:             * used in order. If using the first argument is successful, the second
077:             * one will not be used.
078:             * <P>
079:             * This method is package private so that this code can be shared.
080:             *
081:             * @return the <code>Class</code> object of the specified message factory;
082:             *         may not be <code>null</code>
083:             *
084:             * @param factoryId             the name of the factory to find, which is
085:             *                              a system property
086:             * @param fallbackClassName     the implementation class name, which is
087:             *                              to be used only if nothing else
088:             *                              is found; <code>null</code> to indicate that
089:             *                              there is no fallback class name
090:             * @exception ELException if there is an error
091:             */
092:            static Object find(String factoryId, String fallbackClassName,
093:                    Properties properties) {
094:                ClassLoader classLoader;
095:                try {
096:                    classLoader = Thread.currentThread()
097:                            .getContextClassLoader();
098:                } catch (Exception x) {
099:                    throw new ELException(x.toString(), x);
100:                }
101:
102:                String serviceId = "META-INF/services/" + factoryId;
103:                // try to find services in CLASSPATH
104:                try {
105:                    InputStream is = null;
106:                    if (classLoader == null) {
107:                        is = ClassLoader.getSystemResourceAsStream(serviceId);
108:                    } else {
109:                        is = classLoader.getResourceAsStream(serviceId);
110:                    }
111:
112:                    if (is != null) {
113:                        BufferedReader rd = new BufferedReader(
114:                                new InputStreamReader(is, "UTF-8"));
115:
116:                        String factoryClassName = rd.readLine();
117:                        rd.close();
118:
119:                        if (factoryClassName != null
120:                                && !"".equals(factoryClassName)) {
121:                            return newInstance(factoryClassName, classLoader,
122:                                    properties);
123:                        }
124:                    }
125:                } catch (Exception ex) {
126:                }
127:
128:                // try to read from $java.home/lib/el.properties
129:                try {
130:                    String javah = System.getProperty("java.home");
131:                    String configFile = javah + File.separator + "lib"
132:                            + File.separator + "el.properties";
133:                    File f = new File(configFile);
134:                    if (f.exists()) {
135:                        Properties props = new Properties();
136:                        props.load(new FileInputStream(f));
137:                        String factoryClassName = props.getProperty(factoryId);
138:                        return newInstance(factoryClassName, classLoader,
139:                                properties);
140:                    }
141:                } catch (Exception ex) {
142:                }
143:
144:                // Use the system property
145:                try {
146:                    String systemProp = System.getProperty(factoryId);
147:                    if (systemProp != null) {
148:                        return newInstance(systemProp, classLoader, properties);
149:                    }
150:                } catch (SecurityException se) {
151:                }
152:
153:                if (fallbackClassName == null) {
154:                    throw new ELException("Provider for " + factoryId
155:                            + " cannot be found", null);
156:                }
157:
158:                return newInstance(fallbackClassName, classLoader, properties);
159:            }
160:        }
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