001: /*--
002:
003: Copyright (C) 2000-2003 Anthony Eden.
004: All rights reserved.
005:
006: Redistribution and use in source and binary forms, with or without
007: modification, are permitted provided that the following conditions
008: are met:
009:
010: 1. Redistributions of source code must retain the above copyright
011: notice, this list of conditions, and the following disclaimer.
012:
013: 2. Redistributions in binary form must reproduce the above copyright
014: notice, this list of conditions, and the disclaimer that follows
015: these conditions in the documentation and/or other materials
016: provided with the distribution.
017:
018: 3. The name "EdenLib" must not be used to endorse or promote products
019: derived from this software without prior written permission. For
020: written permission, please contact me@anthonyeden.com.
021:
022: 4. Products derived from this software may not be called "EdenLib", nor
023: may "EdenLib" appear in their name, without prior written permission
024: from Anthony Eden (me@anthonyeden.com).
025:
026: In addition, I request (but do not require) that you include in the
027: end-user documentation provided with the redistribution and/or in the
028: software itself an acknowledgement equivalent to the following:
029: "This product includes software developed by
030: Anthony Eden (http://www.anthonyeden.com/)."
031:
032: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
036: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
037: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
038: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
039: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
040: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
041: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
042: POSSIBILITY OF SUCH DAMAGE.
043:
044: For more information on EdenLib, please see <http://edenlib.sf.net/>.
045:
046: */
047:
048: package com.anthonyeden.lib.resource;
049:
050: import com.anthonyeden.lib.util.IOUtilities;
051: import org.apache.commons.logging.Log;
052: import org.apache.commons.logging.LogFactory;
053:
054: import java.io.File;
055: import java.io.FileInputStream;
056: import java.io.FileNotFoundException;
057: import java.io.InputStream;
058:
059: /**
060: * Implementation of the ResourceLoader interface which loads data from
061: * a file.
062: *
063: * @author Anthony Eden
064: * @author <a href="mailto:florin.patrascu@gmail.com">Florin T.PATRASCU</a>
065: */
066:
067: public class FileResourceLoader extends AbstractResourceLoader {
068:
069: private static final Log log = LogFactory
070: .getLog(FileResourceLoader.class);
071:
072: /**
073: * Load the resource specified by the given path. Calling this method will
074: * cause the resource to be loaded and monitored.
075: *
076: * @param path The path
077: * @param handler The ResourceReceipient callback
078: * @throws ResourceException
079: */
080:
081: public void loadResource(String path, ResourceRecipient handler)
082: throws ResourceException {
083: loadResource(path, handler, true);
084: }
085:
086: /**
087: * Load the resource specified by the given path. If monitor is true then
088: * the ResourceLoader implementation will monitor the resource and call the
089: * ResourceRecipient each time the resource is modified.
090: *
091: * @param path The path
092: * @param handler The ResourceRecipient callback
093: * @param monitor True to monitor the resource
094: * @throws ResourceException
095: */
096:
097: public void loadResource(String path, ResourceRecipient handler,
098: boolean monitor) throws ResourceException {
099:
100: InputStream in = null;
101: try {
102: if (log.isDebugEnabled())
103: log.debug("Resource path: " + path);
104:
105: File file = new File(path);
106: if (!file.exists()) {
107: throw new FileNotFoundException("File not found: "
108: + file);
109: }
110:
111: in = new FileInputStream(file);
112: handler.load(in);
113:
114: if (monitor) {
115: ResourceFileMonitor fileMonitor = new ResourceFileMonitor(
116: file, getDelay(), handler);
117: getMonitors().add(fileMonitor);
118: fileMonitor.startMonitor();
119: }
120: } catch (Exception e) {
121: log.error(e.getMessage());
122: throw new ResourceException(e);
123: } finally {
124: IOUtilities.close(in);
125: }
126: }
127:
128: }
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