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The basic runtime tools and interfaces for intarsys components.
/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.intarsys.tools.locator;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import de.intarsys.tools.charset.ICharsetAccess;
import de.intarsys.tools.file.FileTools;
import de.intarsys.tools.locking.ILock;
import de.intarsys.tools.locking.ILockLevel;
import de.intarsys.tools.locking.ILockSupport;
import de.intarsys.tools.logging.LogTools;
import de.intarsys.tools.randomaccess.IRandomAccess;
import de.intarsys.tools.randomaccess.RandomAccessFile;
import de.intarsys.tools.stream.StreamTools;
import de.intarsys.tools.stream.TempFileOutputStream;
import de.intarsys.tools.string.StringTools;
/**
* File based implementation of {@link ILocator}.
*/
public class FileLocator extends CommonLocator implements ILockSupport,
ICharsetAccess {
class FileLocatorLock implements ILock {
private java.io.RandomAccessFile ra;
@Override
public boolean acquire(Object owner, ILockLevel level) {
try {
ra = new java.io.RandomAccessFile(getFile(), "r");
return true;
} catch (FileNotFoundException e) {
return false;
}
}
@Override
public void release(Object owner) {
StreamTools.close(ra);
}
}
/**
* The file referenced by the locator
*/
private File file;
private String charset;
/**
* Flag if the resource is out of synch
*/
private boolean outOfSynch;
/**
* flag if we synchronize synchronously with every check
*/
private boolean synchSynchronous = false;
/**
* Timestamp of last modification to the resource.
*/
private long lastModified = 0;
/**
* flag if output is created initially in a temporary file
*/
private boolean useTempFile = false;
private File canonicalFile;
final private boolean append;
public FileLocator(File file) {
super();
this.file = file;
this.append = false;
}
public FileLocator(File file, boolean append) {
super();
this.file = file;
this.append = append;
}
public FileLocator(String path) {
this(new File(path));
}
@Override
public void delete() throws IOException {
if (getFile() == null) {
return;
}
getFile().delete();
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (!(obj instanceof FileLocator)) {
return false;
}
return getCanonicalFile()
.equals(((FileLocator) obj).getCanonicalFile());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#exists()
*/
@Override
public boolean exists() {
return getFile().exists();
}
/**
* The canonical file represented by this.
*
* @return The canonical file represented by this.
*/
public File getCanonicalFile() {
if (canonicalFile == null) {
try {
canonicalFile = getFile().getCanonicalFile();
} catch (IOException e) {
canonicalFile = getFile();
}
}
return canonicalFile;
}
@Override
public String getCharset() {
return charset;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getChild(java.lang.String)
*/
@Override
public ILocator getChild(String name) {
File childfile = new File(getFile(), name);
FileLocator result = new FileLocator(childfile);
result.setSynchSynchronous(isSynchSynchronous());
return result;
}
/**
* Answer the file represented by this.
*
* @return The canonical file represented by this.
*/
public File getFile() {
return file;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getFullName()
*/
@Override
public String getFullName() {
if (getFile() == null) {
return "unknown";
}
return getFile().getAbsolutePath();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getInputStream()
*/
@Override
public InputStream getInputStream() throws IOException {
// trigger timestamp reading
getLastModified();
return new FileInputStream(getFile());
}
/**
* Answer the timestamp of the last modification.
*
* @return the timestamp of the last modification.
*/
protected long getLastModified() {
if (lastModified == 0) {
if (file.exists()) {
lastModified = file.lastModified();
}
}
return lastModified;
}
@Override
public long getLength() throws IOException {
return file.length();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getLocalName()
*/
@Override
public String getLocalName() {
if (getFile() == null) {
return "unknown";
}
return FileTools.getBaseName(getFile());
}
@Override
public ILock getLock() {
return new FileLocatorLock();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getOutputStream()
*/
@Override
public OutputStream getOutputStream() throws IOException {
// trigger timestamp reading
getLastModified();
if (!getFile().getParentFile().exists()) {
getFile().getParentFile().mkdirs();
}
if (isUseTempFile()) {
return new TempFileOutputStream(getFile(), "tmp_", "." + getType());
}
return new FileOutputStream(getFile(), isAppend());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getParent()
*/
@Override
public ILocator getParent() {
File parentFile = FileTools.getParentFile(getFile());
if (parentFile == null) {
return null;
}
FileLocator result = new FileLocator(parentFile);
result.setSynchSynchronous(isSynchSynchronous());
return result;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getRandomAccess()
*/
@Override
public IRandomAccess getRandomAccess() throws IOException {
// trigger timestamp reading
getLastModified();
if (isUseTempFile()) {
throw new UnsupportedOperationException(
"no random access to temp file");
}
return new RandomAccessFile(getFile());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getReader()
*/
@Override
public Reader getReader() throws IOException {
// trigger timestamp reading
getLastModified();
if (StringTools.isEmpty(getCharset())) {
return new InputStreamReader(getInputStream());
}
return new InputStreamReader(getInputStream(), getCharset());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getReader(java.lang.String)
*/
@Override
public Reader getReader(String charset) throws IOException {
// trigger timestamp reading
getLastModified();
if (StringTools.isEmpty(charset)) {
return getReader();
}
return new InputStreamReader(getInputStream(), charset);
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getType()
*/
@Override
public String getType() {
if (getFile() == null) {
return "";
}
return FileTools.getExtension(getFile());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getTypedName()
*/
@Override
public String getTypedName() {
if (getFile() == null) {
return "unknown";
}
return getFile().getName();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getWriter()
*/
@Override
public Writer getWriter() throws IOException {
// trigger timestamp reading
getLastModified();
if (StringTools.isEmpty(getCharset())) {
return new OutputStreamWriter(getOutputStream());
}
return new OutputStreamWriter(getOutputStream(), getCharset());
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#getWriter(java.lang.String)
*/
@Override
public Writer getWriter(String charset) throws IOException {
// trigger timestamp reading
getLastModified();
if (StringTools.isEmpty(charset)) {
return getWriter();
}
return new OutputStreamWriter(getOutputStream(), charset);
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
try {
return getFile().getCanonicalFile().hashCode();
} catch (IOException e) {
return 17;
}
}
public boolean isAppend() {
return append;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#isDirectory()
*/
@Override
public boolean isDirectory() {
return getFile().isDirectory();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.component.ISynchronizable#isOutOfSynch()
*/
@Override
public synchronized boolean isOutOfSynch() {
if (isSynchSynchronous()) {
synch();
}
return outOfSynch;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#isReadOnly()
*/
@Override
public boolean isReadOnly() {
if (super.isReadOnly()) {
return true;
}
IRandomAccess r = null;
try {
if (!getFile().exists()) {
if (getFile().createNewFile()) {
getFile().delete();
return false;
}
return true;
}
r = getRandomAccess();
if (r == null || r.isReadOnly()) {
return true;
}
return false;
} catch (IOException e) {
return true;
} finally {
StreamTools.close(r);
}
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.component.ISynchronizable#isSynchSynchronous()
*/
public boolean isSynchSynchronous() {
return synchSynchronous;
}
/**
* true if temp file should be used.
*
* @return true if temp file should be used.
*/
public boolean isUseTempFile() {
return useTempFile;
}
/*
* (non-Javadoc)
*
* @see
* de.intarsys.tools.locator.ILocator#listLocators(de.intarsys.tools.locator
* .ILocatorNameFilter)
*/
@Override
public ILocator[] listLocators(final ILocatorNameFilter filter)
throws IOException {
if (!getFile().exists()) {
throw new FileNotFoundException(getFile().getName() + " not found");
}
if (!getFile().isDirectory()) {
throw new IOException(getFile().getName() + " not a directory");
}
File[] candidates;
if (filter == null) {
candidates = getFile().listFiles();
} else {
candidates = getFile().listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String current) {
return filter.accept(FileLocator.this, current);
}
});
}
if (candidates == null) {
throw new IOException("error listing resources");
}
ILocator[] result = new ILocator[candidates.length];
for (int i = 0; i < result.length; i++) {
FileLocator l = new FileLocator(candidates[i].getPath());
l.setSynchSynchronous(isSynchSynchronous());
l.setCharset(getCharset());
result[i] = l;
}
return result;
}
@Override
public void rename(String newName) throws IOException {
if (getFile() == null) {
return;
}
File newFile = new File(newName);
if (!newFile.isAbsolute()) {
File parent = getFile().getParentFile();
if (parent == null) {
parent = getFile().getAbsoluteFile().getParentFile();
}
if (parent == null) {
newFile = new File(newName);
} else {
newFile = new File(parent, newName);
}
}
FileTools.renameFile(getFile(), newFile);
file = newFile;
canonicalFile = null;
lastModified = 0;
}
@Override
public void setCharset(String charset) {
this.charset = charset;
}
/**
* @param synchSynchronous
*/
public void setSynchSynchronous(boolean synchSynchronous) {
this.synchSynchronous = synchSynchronous;
}
/**
* @param useTempFile
*/
public void setUseTempFile(boolean useTempFile) {
this.useTempFile = useTempFile;
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.component.ISynchronizable#synch()
*/
@Override
public synchronized void synch() {
if (getFile() == null) {
return;
}
if ((getLastModified() != getFile().lastModified())) {
LogTools.getLogger(this.getClass()).log(Level.FINEST,
"'" + getFullName() + "' out of synch!");
outOfSynch = true;
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return getFile().toString();
}
/*
* (non-Javadoc)
*
* @see de.intarsys.tools.locator.ILocator#toURL()
*/
@Override
public URL toURL() {
try {
if (isDirectory()) {
return new URL("file", null, getFullName() + "/");
} else {
return new URL("file", null, getFullName());
}
} catch (MalformedURLException e) {
return null;
}
}
}
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