|
Commons Digester example source code file (FinderFromFile.java)
The Commons Digester FinderFromFile.java source code/* $Id: FinderFromFile.java 992060 2010-09-02 19:09:47Z simonetripodi $ * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.digester.plugins.strategies; import java.util.Properties; import java.io.InputStream; import java.io.FileInputStream; import java.io.IOException; import org.apache.commons.digester.Digester; import org.apache.commons.digester.plugins.RuleFinder; import org.apache.commons.digester.plugins.RuleLoader; import org.apache.commons.digester.plugins.PluginException; /** * A rule-finding algorithm which expects the user to specify an absolute * or relative path in the plugin declaration. * <p> * The file is expected to contain Digester rules in xmlrules format. * * @since 1.6 */ public class FinderFromFile extends RuleFinder { /** * Xml attribute that needs to be present on a plugin declaration * in order to specify the file to load rules from. */ public static String DFLT_FILENAME_ATTR = "file"; /** See {@link #findLoader}. */ private String filenameAttr; /** See {@link #findLoader}. */ public FinderFromFile() { this(DFLT_FILENAME_ATTR); } /** See {@link #findLoader}. */ public FinderFromFile(String filenameAttr) { this.filenameAttr = filenameAttr; } /** * If there exists a property with the name specified in the constructor, * then load that file, run it through the xmlrules module and return an * object encapsulating those rules. * <p> * If there is no matching property provided, then just return null. * <p> * The returned object (when non-null) will add the selected rules to * the digester whenever its addRules method is invoked. */ @Override public RuleLoader findLoader(Digester d, Class<?> pluginClass, Properties p) throws PluginException { String rulesFileName = p.getProperty(filenameAttr); if (rulesFileName == null) { // nope, user hasn't requested dynamic rules to be loaded // from a specific file. return null; } InputStream is = null; try { is = new FileInputStream(rulesFileName); } catch(IOException ioe) { throw new PluginException( "Unable to process file [" + rulesFileName + "]", ioe); } try { RuleLoader loader = new LoaderFromStream(is); return loader; } catch(Exception e) { throw new PluginException( "Unable to load xmlrules from file [" + rulesFileName + "]", e); } finally { try { is.close(); } catch(java.io.IOException ioe) { throw new PluginException( "Unable to close stream for file [" + rulesFileName + "]", ioe); } } } } Other Commons Digester examples (source code examples)Here is a short list of links related to this Commons Digester FinderFromFile.java source code file: |
... this post is sponsored by my books ... | |
#1 New Release! |
FP Best Seller |
Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.
A percentage of advertising revenue from
pages under the /java/jwarehouse
URI on this website is
paid back to open source projects.