Java tutorial
/* * Copyright open knowledge GmbH * * Licensed 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 de.openknowledge.cdi.common.property.source; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.net.URI; import java.util.Properties; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * * A property source loader that loads properties from a file. Supports * relative or absolute files. * <p/> * Processes sources that start with <code>file://</code>. * <p/> * Order value is {@link Integer#MAX_VALUE} - 1. * * @author Jens Schumann - open knowledge GmbH * @author Arne Limburg - open knowledge GmbH * @version $Revision: 7659 $ */ public class FilePropertySourceLoader extends AbstractPropertySourceLoader { public static final String FILE_SCHEME = "file"; private static final Log LOG = LogFactory.getLog(FilePropertySourceLoader.class); public boolean supports(URI source) { return FILE_SCHEME.equals(source.getScheme()); } public Properties load(URI resource) { Properties properties = new Properties(); try { File file; if (resource.isOpaque()) { file = new File(resource.getSchemeSpecificPart()); } else { file = new File(resource); } if (file.exists() && file.canRead()) { LOG.debug("Loading properties from file " + file); loadFromStream(properties, new FileInputStream(file)); } else { LOG.debug("Unable to load properties from file " + file + ". File does not exist or is not readable."); } } catch (IOException e) { LOG.warn("Error loading properties from file resource " + resource + ": " + e.getMessage()); } return properties; } }