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| org.apache.commons.configuration.JNDIConfiguration |
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| 1 | /* |
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| 2 | * Copyright 2001-2004 The Apache Software Foundation. |
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| 3 | * |
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License") |
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| 5 | * you may not use this file except in compliance with the License. |
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| 6 | * You may obtain a copy of the License at |
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| 7 | * |
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | * |
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| 10 | * Unless required by applicable law or agreed to in writing, software |
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | * See the License for the specific language governing permissions and |
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| 14 | * limitations under the License. |
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| 15 | */ |
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| 16 | ||
| 17 | package org.apache.commons.configuration; |
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| 18 | ||
| 19 | import java.util.ArrayList; |
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| 20 | import java.util.HashSet; |
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| 21 | import java.util.Iterator; |
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| 22 | import java.util.List; |
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| 23 | import java.util.Properties; |
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| 24 | import java.util.Set; |
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| 25 | ||
| 26 | import javax.naming.Context; |
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| 27 | import javax.naming.InitialContext; |
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| 28 | import javax.naming.NameClassPair; |
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| 29 | import javax.naming.NameNotFoundException; |
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| 30 | import javax.naming.NamingEnumeration; |
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| 31 | import javax.naming.NamingException; |
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| 32 | import javax.naming.NotContextException; |
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| 33 | ||
| 34 | import org.apache.commons.lang.StringUtils; |
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| 35 | import org.apache.commons.logging.Log; |
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| 36 | import org.apache.commons.logging.LogFactory; |
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| 37 | ||
| 38 | /** |
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| 39 | * This Configuration class allows you to interface with a JNDI datasource. |
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| 40 | * A JNDIConfiguration is read-only, write operations will throw an |
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| 41 | * UnsupportedOperationException. The clear operations are supported but the |
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| 42 | * underlying JNDI data source is not changed. |
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| 43 | * |
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| 44 | * @author <a href="mailto:epugh@upstate.com">Eric Pugh</a> |
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| 45 | * @version $Id: JNDIConfiguration.java,v 1.19 2004/10/04 20:06:09 ebourg Exp $ |
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| 46 | */ |
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| 47 | public class JNDIConfiguration extends AbstractConfiguration |
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| 48 | { |
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| 49 | /** Logger. */ |
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| 50 | 12 | private static Log log = LogFactory.getLog(JNDIConfiguration.class); |
| 51 | ||
| 52 | /** The prefix of the context. */ |
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| 53 | private String prefix; |
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| 54 | ||
| 55 | /** The initial JNDI context. */ |
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| 56 | private Context context; |
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| 57 | ||
| 58 | /** The base JNDI context. */ |
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| 59 | private Context baseContext; |
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| 60 | ||
| 61 | /** The Set of keys that have been virtually cleared. */ |
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| 62 | 48 | private Set clearedProperties = new HashSet(); |
| 63 | ||
| 64 | /** |
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| 65 | * Creates a JNDIConfiguration using the default initial context as the |
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| 66 | * root of the properties. |
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| 67 | * |
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| 68 | * @throws NamingException thrown if an error occurs when initializing the default context |
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| 69 | */ |
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| 70 | public JNDIConfiguration() throws NamingException |
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| 71 | { |
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| 72 | 46 | this((String) null); |
| 73 | 46 | } |
| 74 | ||
| 75 | /** |
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| 76 | * Creates a JNDIConfiguration using the default initial context, shifted |
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| 77 | * with the specified prefix, as the root of the properties. |
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| 78 | * |
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| 79 | * @param prefix |
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| 80 | * |
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| 81 | * @throws NamingException thrown if an error occurs when initializing the default context |
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| 82 | */ |
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| 83 | public JNDIConfiguration(String prefix) throws NamingException |
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| 84 | { |
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| 85 | 46 | this(new InitialContext(), prefix); |
| 86 | 46 | } |
| 87 | ||
| 88 | /** |
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| 89 | * Creates a JNDIConfiguration using the specified initial context as the |
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| 90 | * root of the properties. |
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| 91 | * |
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| 92 | * @param context the initial context |
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| 93 | */ |
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| 94 | public JNDIConfiguration(Context context) |
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| 95 | { |
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| 96 | 1 | this(context, null); |
| 97 | 1 | } |
| 98 | ||
| 99 | /** |
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| 100 | * Creates a JNDIConfiguration using the specified initial context shifted |
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| 101 | * by the specified prefix as the root of the properties. |
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| 102 | * |
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| 103 | * @param context the initial context |
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| 104 | * @param prefix |
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| 105 | */ |
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| 106 | public JNDIConfiguration(Context context, String prefix) |
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| 107 | 48 | { |
| 108 | 48 | this.context = context; |
| 109 | 48 | this.prefix = prefix; |
| 110 | 48 | } |
| 111 | ||
| 112 | /** |
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| 113 | * JNDIConfigurations can not be added to. |
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| 114 | * |
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| 115 | * @param key The Key to add the property to. |
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| 116 | * @param token The Value to add. |
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| 117 | */ |
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| 118 | public void addProperty(String key, Object token) |
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| 119 | { |
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| 120 | 0 | throw new UnsupportedOperationException("This operation is not supported"); |
| 121 | } |
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| 122 | ||
| 123 | /** |
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| 124 | * This method recursive traverse the JNDI tree, looking for Context objects. |
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| 125 | * When it finds them, it traverses them as well. Otherwise it just adds the |
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| 126 | * values to the list of keys found. |
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| 127 | * |
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| 128 | * @param keys All the keys that have been found. |
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| 129 | * @param context The parent context |
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| 130 | * @param prefix What prefix we are building on. |
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| 131 | * @throws NamingException If JNDI has an issue. |
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| 132 | */ |
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| 133 | private void recursiveGetKeys(Set keys, Context context, String prefix) throws NamingException |
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| 134 | { |
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| 135 | 9 | NamingEnumeration elements = null; |
| 136 | ||
| 137 | try |
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| 138 | { |
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| 139 | 9 | elements = context.list(""); |
| 140 | ||
| 141 | // iterates through the context's elements |
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| 142 | 72 | while (elements.hasMore()) |
| 143 | { |
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| 144 | 63 | NameClassPair nameClassPair = (NameClassPair) elements.next(); |
| 145 | 63 | String name = nameClassPair.getName(); |
| 146 | 63 | Object object = context.lookup(name); |
| 147 | ||
| 148 | // build the key |
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| 149 | 63 | StringBuffer key = new StringBuffer(); |
| 150 | 63 | key.append(prefix); |
| 151 | 63 | if (key.length() > 0) |
| 152 | { |
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| 153 | 60 | key.append("."); |
| 154 | } |
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| 155 | 63 | key.append(name); |
| 156 | ||
| 157 | 63 | if (object instanceof Context) |
| 158 | { |
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| 159 | // add the keys of the sub context |
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| 160 | 3 | Context subcontext = (Context) object; |
| 161 | 3 | recursiveGetKeys(keys, subcontext, key.toString()); |
| 162 | } |
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| 163 | else |
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| 164 | { |
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| 165 | // add the key |
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| 166 | 60 | keys.add(key.toString()); |
| 167 | } |
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| 168 | } |
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| 169 | } |
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| 170 | finally |
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| 171 | { |
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| 172 | // close the enumeration |
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| 173 | 9 | if (elements != null) |
| 174 | { |
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| 175 | 9 | elements.close(); |
| 176 | } |
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| 177 | } |
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| 178 | 9 | } |
| 179 | ||
| 180 | /** |
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| 181 | * {@inheritDoc} |
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| 182 | */ |
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| 183 | public Iterator getKeys() |
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| 184 | { |
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| 185 | 3 | return getKeys(""); |
| 186 | } |
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| 187 | ||
| 188 | /** |
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| 189 | * {@inheritDoc} |
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| 190 | */ |
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| 191 | public Iterator getKeys(String prefix) |
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| 192 | { |
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| 193 | // build the path |
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| 194 | 10 | String[] splitPath = StringUtils.split(prefix, "."); |
| 195 | ||
| 196 | 10 | List path = new ArrayList(); |
| 197 | ||
| 198 | 21 | for (int i = 0; i < splitPath.length; i++) |
| 199 | { |
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| 200 | 11 | path.add(splitPath[i]); |
| 201 | } |
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| 202 | ||
| 203 | try |
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| 204 | { |
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| 205 | // find the context matching the specified path |
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| 206 | 10 | Context context = getContext(path, getBaseContext()); |
| 207 | ||
| 208 | // return all the keys under the context found |
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| 209 | 10 | Set keys = new HashSet(); |
| 210 | 10 | if (context != null) |
| 211 | { |
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| 212 | 6 | recursiveGetKeys(keys, context, prefix); |
| 213 | } |
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| 214 | 4 | else if (containsKey(prefix)) |
| 215 | { |
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| 216 | // add the prefix if it matches exactly a property key |
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| 217 | 2 | keys.add(prefix); |
| 218 | } |
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| 219 | ||
| 220 | 10 | return keys.iterator(); |
| 221 | } |
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| 222 | 0 | catch (NamingException e) |
| 223 | { |
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| 224 | 0 | throw new ConfigurationRuntimeException(e.getMessage(), e); |
| 225 | } |
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| 226 | } |
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| 227 | ||
| 228 | /** |
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| 229 | * Because JNDI is based on a tree configuration, we need to filter down the |
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| 230 | * tree, till we find the Context specified by the key to start from. |
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| 231 | * Otherwise return null. |
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| 232 | * |
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| 233 | * @param path the path of keys to traverse in order to find the context |
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| 234 | * @param context the context to start from |
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| 235 | * @return The context at that key's location in the JNDI tree, or null if not found |
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| 236 | * @throws NamingException if JNDI has an issue |
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| 237 | */ |
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| 238 | private Context getContext(List path, Context context) throws NamingException |
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| 239 | { |
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| 240 | // return the current context if the path is empty |
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| 241 | 15 | if (path == null || path.isEmpty()) |
| 242 | { |
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| 243 | 6 | return context; |
| 244 | } |
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| 245 | ||
| 246 | 9 | String key = (String) path.get(0); |
| 247 | ||
| 248 | // search a context matching the key in the context's elements |
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| 249 | 9 | NamingEnumeration elements = null; |
| 250 | ||
| 251 | try |
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| 252 | { |
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| 253 | 9 | elements = context.list(""); |
| 254 | 31 | while (elements.hasMore()) |
| 255 | { |
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| 256 | 27 | NameClassPair nameClassPair = (NameClassPair) elements.next(); |
| 257 | 27 | String name = nameClassPair.getName(); |
| 258 | 27 | Object object = context.lookup(name); |
| 259 | ||
| 260 | 27 | if (object instanceof Context && name.equals(key)) |
| 261 | { |
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| 262 | 5 | Context subcontext = (Context) object; |
| 263 | ||
| 264 | // recursive search in the sub context |
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| 265 | 5 | return getContext(path.subList(1, path.size()), subcontext); |
| 266 | } |
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| 267 | } |
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| 268 | } |
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| 269 | finally |
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| 270 | { |
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| 271 | 9 | if (elements != null) |
| 272 | { |
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| 273 | 9 | elements.close(); |
| 274 | } |
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| 275 | } |
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| 276 | ||
| 277 | 4 | return null; |
| 278 | } |
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| 279 | ||
| 280 | /** |
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| 281 | * {@inheritDoc} |
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| 282 | * |
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| 283 | * <b>This operation is not supported</b> |
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| 284 | */ |
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| 285 | public Properties getProperties(String key) |
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| 286 | { |
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| 287 | 0 | throw new UnsupportedOperationException("This operation is not supported"); |
| 288 | } |
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| 289 | ||
| 290 | /** |
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| 291 | * {@inheritDoc} |
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| 292 | */ |
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| 293 | public boolean isEmpty() |
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| 294 | { |
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| 295 | try |
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| 296 | { |
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| 297 | 2 | NamingEnumeration enumeration = null; |
| 298 | ||
| 299 | try |
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| 300 | { |
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| 301 | 2 | enumeration = getBaseContext().list(""); |
| 302 | 2 | return !enumeration.hasMore(); |
| 303 | } |
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| 304 | finally |
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| 305 | { |
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| 306 | // close the enumeration |
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| 307 | 2 | if (enumeration != null) |
| 308 | { |
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| 309 | 2 | enumeration.close(); |
| 310 | } |
|
| 311 | } |
|
| 312 | } |
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| 313 | 0 | catch (NamingException ne) |
| 314 | { |
|
| 315 | 0 | log.warn(ne); |
| 316 | 0 | return true; |
| 317 | } |
|
| 318 | } |
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| 319 | ||
| 320 | /** |
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| 321 | * {@inheritDoc} |
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| 322 | */ |
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| 323 | public Object getProperty(String key) |
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| 324 | { |
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| 325 | 13 | return getPropertyDirect(key); |
| 326 | } |
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| 327 | ||
| 328 | /** |
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| 329 | * {@inheritDoc} |
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| 330 | */ |
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| 331 | public void setProperty(String key, Object value) |
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| 332 | { |
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| 333 | 0 | throw new UnsupportedOperationException("This operation is not supported"); |
| 334 | } |
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| 335 | ||
| 336 | /** |
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| 337 | * {@inheritDoc} |
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| 338 | */ |
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| 339 | public void clearProperty(String key) |
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| 340 | { |
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| 341 | 4 | clearedProperties.add(key); |
| 342 | 4 | } |
| 343 | ||
| 344 | /** |
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| 345 | * {@inheritDoc} |
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| 346 | */ |
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| 347 | public boolean containsKey(String key) |
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| 348 | { |
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| 349 | 10 | if (clearedProperties.contains(key)) |
| 350 | { |
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| 351 | 1 | return false; |
| 352 | } |
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| 353 | 9 | key = StringUtils.replace(key, ".", "/"); |
| 354 | try |
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| 355 | { |
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| 356 | // throws a NamingException if JNDI doesn't contain the key. |
|
| 357 | 9 | getBaseContext().lookup(key); |
| 358 | 5 | return true; |
| 359 | } |
|
| 360 | 4 | catch (NamingException ne) |
| 361 | { |
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| 362 | 4 | return false; |
| 363 | } |
|
| 364 | } |
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| 365 | ||
| 366 | /** |
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| 367 | * @return String |
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| 368 | */ |
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| 369 | public String getPrefix() |
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| 370 | { |
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| 371 | 0 | return prefix; |
| 372 | } |
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| 373 | ||
| 374 | /** |
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| 375 | * Sets the prefix. |
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| 376 | * |
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| 377 | * @param prefix The prefix to set |
|
| 378 | */ |
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| 379 | public void setPrefix(String prefix) |
|
| 380 | { |
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| 381 | 2 | this.prefix = prefix; |
| 382 | ||
| 383 | // clear the previous baseContext |
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| 384 | 2 | baseContext = null; |
| 385 | 2 | } |
| 386 | ||
| 387 | /** |
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| 388 | * {@inheritDoc} |
|
| 389 | */ |
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| 390 | protected Object getPropertyDirect(String key) |
|
| 391 | { |
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| 392 | 67 | if (clearedProperties.contains(key)) |
| 393 | { |
|
| 394 | 3 | return null; |
| 395 | } |
|
| 396 | ||
| 397 | try |
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| 398 | { |
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| 399 | 64 | key = StringUtils.replace(key, ".", "/"); |
| 400 | 64 | return getBaseContext().lookup(key); |
| 401 | } |
|
| 402 | 7 | catch (NameNotFoundException e) |
| 403 | { |
|
| 404 | 7 | return null; |
| 405 | } |
|
| 406 | 7 | catch (NotContextException e) |
| 407 | { |
|
| 408 | 7 | return null; |
| 409 | } |
|
| 410 | 0 | catch (NamingException e) |
| 411 | { |
|
| 412 | 0 | e.printStackTrace(); |
| 413 | 0 | return null; |
| 414 | } |
|
| 415 | } |
|
| 416 | ||
| 417 | /** |
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| 418 | * {@inheritDoc} |
|
| 419 | */ |
|
| 420 | protected void addPropertyDirect(String key, Object obj) |
|
| 421 | { |
|
| 422 | 0 | throw new UnsupportedOperationException("This operation is not supported"); |
| 423 | } |
|
| 424 | ||
| 425 | /** |
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| 426 | * Return the base context with the prefix applied. |
|
| 427 | */ |
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| 428 | public Context getBaseContext() throws NamingException |
|
| 429 | { |
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| 430 | 85 | if (baseContext == null) |
| 431 | { |
|
| 432 | 46 | baseContext = (Context) getContext().lookup(prefix == null ? "" : prefix); |
| 433 | } |
|
| 434 | ||
| 435 | 85 | return baseContext; |
| 436 | } |
|
| 437 | ||
| 438 | /** |
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| 439 | * Return the initial context used by this configuration. This context is |
|
| 440 | * independent of the prefix specified. |
|
| 441 | */ |
|
| 442 | public Context getContext() |
|
| 443 | { |
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| 444 | 46 | return context; |
| 445 | } |
|
| 446 | ||
| 447 | /** |
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| 448 | * Set the initial context of the configuration. |
|
| 449 | */ |
|
| 450 | public void setContext(Context context) |
|
| 451 | { |
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| 452 | // forget the removed properties |
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| 453 | 1 | clearedProperties.clear(); |
| 454 | ||
| 455 | // change the context |
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| 456 | 1 | this.context = context; |
| 457 | 1 | } |
| 458 | } |
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