/**
* Copyright 2010 JBoss Inc
*
* 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.eclipse.builder;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.drools.eclipse.DroolsEclipsePlugin;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
/**
* Utility class.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">kris verlaenen </a>
*/
public class Util {
public static final char[] NO_CHAR = new char[0];
private static final int DEFAULT_READING_SIZE = 8192;
public static char[] getResourceContentsAsCharArray(IFile file) throws CoreException {
String encoding = null;
try {
encoding = file.getCharset();
}
catch(CoreException ce) {
// do not use any encoding
}
InputStream stream= null;
stream = new BufferedInputStream(file.getContents(true));
try {
return getInputStreamAsCharArray(stream, -1, encoding);
} catch (IOException e) {
throw new CoreException(new Status(IStatus.ERROR, DroolsEclipsePlugin.PLUGIN_ID, IStatus.ERROR, "IOException", e));
} finally {
try {
stream.close();
} catch (IOException e) {
// ignore
}
}
}
private static char[] getInputStreamAsCharArray(InputStream stream,
int length, String encoding) throws IOException {
InputStreamReader reader = null;
reader = encoding == null ? new InputStreamReader(stream)
: new InputStreamReader(stream, encoding);
char[] contents;
if (length == -1) {
contents = NO_CHAR;
int contentsLength = 0;
int amountRead = -1;
do {
int amountRequested = Math.max(stream.available(),
DEFAULT_READING_SIZE);
if (contentsLength + amountRequested > contents.length) {
System.arraycopy(contents, 0,
contents = new char[contentsLength
+ amountRequested], 0, contentsLength);
}
amountRead = reader.read(contents, contentsLength,
amountRequested);
if (amountRead > 0) {
contentsLength += amountRead;
}
} while (amountRead != -1);
int start = 0;
if (contentsLength > 0 && "UTF-8".equals(encoding)) {
if (contents[0] == 0xFEFF) {
contentsLength--;
start = 1;
}
}
if (contentsLength < contents.length) {
System.arraycopy(contents, start,
contents = new char[contentsLength], 0, contentsLength);
}
} else {
contents = new char[length];
int len = 0;
int readSize = 0;
while ((readSize != -1) && (len != length)) {
len += readSize;
readSize = reader.read(contents, len, length - len);
}
int start = 0;
if (length > 0 && "UTF-8".equals(encoding)) {
if (contents[0] == 0xFEFF) {
len--;
start = 1;
}
}
if (len != length)
System.arraycopy(contents, start, (contents = new char[len]),
0, len);
}
return contents;
}
}