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/*******************************************************************************
* Copyright (c) 2009, 2017 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.report;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
/**
* Abstract base class for {@link ISourceFileLocator} locator implementations
* based on {@link InputStream}s. It handles the encoding and tab width.
*/
public abstract class InputStreamSourceFileLocator implements
ISourceFileLocator {
private final String encoding;
private final int tabWidth;
/**
* Creates a new locator with the given specification.
*
* @param encoding
* encoding of the source files, <code>null</code> for platform
* default encoding
* @param tabWidth
* tab width in source files as number of blanks
*
*/
protected InputStreamSourceFileLocator(final String encoding,
final int tabWidth) {
this.encoding = encoding;
this.tabWidth = tabWidth;
}
public Reader getSourceFile(final String packageName, final String fileName)
throws IOException {
final InputStream in;
if (packageName.length() > 0) {
in = getSourceStream(packageName + "/" + fileName);
} else {
in = getSourceStream(fileName);
}
if (in == null) {
return null;
}
if (encoding == null) {
return new InputStreamReader(in);
} else {
return new InputStreamReader(in, encoding);
}
}
public int getTabWidth() {
return tabWidth;
}
/**
* Tries to locate the given source file and opens its binary content.
*
* @param path
* local path to the resource
* @return stream if the file could be located, <code>null</code> otherwise
* @throws IOException
* in case of problems while opening the stream
*/
protected abstract InputStream getSourceStream(String path)
throws IOException;
}
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