org.drools.core.io.impl.FileSystemResource Maven / Gradle / Ivy
/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* 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 org.drools.core.io.impl;
import java.io.Externalizable;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Reader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.drools.core.util.IoUtils;
import org.drools.core.util.StringUtils;
import org.drools.core.io.internal.InternalResource;
import org.kie.api.io.Resource;
import org.kie.api.io.ResourceType;
/**
* Borrowed gratuitously from Spring under ASL2.0.
*/
public class FileSystemResource extends BaseResource implements InternalResource, Externalizable {
private File file;
private long lastRead = -1;
private String encoding;
public FileSystemResource() {
}
/**
* Create a new FileSystemResource from a File handle.
* Note: When building relative resources via {@link #createRelative},
* the relative path will apply at the same directory level:
* e.g. new File("C:/dir1"), relative path "dir2" -> "C:/dir2"!
* If you prefer to have relative paths built underneath the given root
* directory, use the {@link #FileSystemResource(String) constructor with a file path}
* to append a trailing slash to the root path: "C:/dir1/", which
* indicates this directory as root for all relative paths.
* @param file a File handle
*/
public FileSystemResource(File file) {
if ( file == null ) {
throw new IllegalArgumentException( "File must not be null" );
}
this.file = new File( StringUtils.cleanPath(file.getPath()) );
try {
setSourcePath( file.getCanonicalPath() );
} catch (IOException e) {
setSourcePath( file.getAbsolutePath() );
}
setResourceType( ResourceType.determineResourceType( getSourcePath() ) );
}
public FileSystemResource(File file, String encoding) {
this(file);
this.encoding = encoding;
}
/**
* Create a new FileSystemResource from a file path.
*
Note: When building relative resources via {@link #createRelative},
* it makes a difference whether the specified resource base path here
* ends with a slash or not. In the case of "C:/dir1/", relative paths
* will be built underneath that root: e.g. relative path "dir2" ->
* "C:/dir1/dir2". In the case of "C:/dir1", relative paths will apply
* at the same directory level: relative path "dir2" -> "C:/dir2".
* @param path a file path
*/
public FileSystemResource(String path) {
if ( path == null ) {
throw new IllegalArgumentException( "Path must not be null" );
}
this.file = new File(StringUtils.cleanPath(path));
setSourcePath( path );
setResourceType( ResourceType.determineResourceType( getSourcePath() ) );
}
public FileSystemResource(String path, String encoding) {
this(path);
this.encoding = encoding;
}
public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal( out );
out.writeObject(this.file);
out.writeObject(this.encoding);
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
super.readExternal( in );
this.file = (File) in.readObject();
this.encoding = (String) in.readObject();
}
public String getEncoding() {
return this.encoding;
}
/**
* This implementation opens a FileInputStream for the underlying file.
* @see java.io.FileInputStream
*/
public InputStream getInputStream() throws IOException {
this.lastRead = getLastModified();
return new FileInputStream(this.file);
}
public Reader getReader() throws IOException {
if (this.encoding != null) {
return new InputStreamReader(getInputStream(), this.encoding);
}
else {
return new InputStreamReader(getInputStream(), IoUtils.UTF8_CHARSET);
}
}
public File getFile() {
return this.file;
}
public boolean isDirectory() {
return this.file.isDirectory();
}
public Collection listResources() {
File[] files = this.file.listFiles();
List resources = new ArrayList();
for ( File file : files ) {
resources.add( new FileSystemResource( file ) );
}
return resources;
}
/**
* This implementation returns a URL for the underlying file.
* @see java.io.File#toURI()
*/
public URL getURL() throws IOException {
return this.file.toURI().toURL();
}
public boolean hasURL() {
return true;
}
public long getLastModified() {
long date = this.file.lastModified();
return date;
}
public long getLastRead() {
return this.lastRead;
}
public String toString() {
return "FileResource[file=" + this.file.toString() + "]";
}
public boolean equals(Object object) {
if ( object == null ) {
return false;
}
return ( object == this || ( object instanceof FileSystemResource && file.equals( ((FileSystemResource)object).file ) ) );
}
public int hashCode() {
return this.file.hashCode();
}
}