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package com.sun.hk2.component;
import org.jvnet.hk2.component.ComponentException;
import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Iterator;
/**
* Scans the stream that follows the <tt>/META-INF/inhabitants/*</tt> format.
*
* <p>
* This class implements {@link Iterable} so that it can be used in for-each loop,
* but it cannot parse the same stream twice.
*
* @author Kohsuke Kawaguchi
*/
public class InhabitantsScanner implements Iterable<InhabitantParser>, Closeable {
private int lineNumber = 0;
private final String systemId;
private BufferedReader r;
private final KeyValuePairParser kvpp = new KeyValuePairParser();
public InhabitantsScanner(InputStream in, String systemId) throws IOException {
r = new BufferedReader(new InputStreamReader(in,"UTF-8"));
this.systemId = systemId;
}
public String getSystemId() {
return systemId;
}
public int getLineNumber() {
return lineNumber;
}
public Iterator<InhabitantParser> iterator() {
return new Iterator<InhabitantParser>() {
private String nextLine;
public boolean hasNext() {
fetch();
return nextLine!=null;
}
private void fetch() {
if(null == r || nextLine!=null) return;
try {
while((nextLine=r.readLine())!=null) {
lineNumber++;
if(nextLine.startsWith("#"))
continue; // comment
return; // found the next line
}
} catch (IOException e) {
throw new ComponentException("Failed to parse line " + lineNumber + " of " + systemId,e);
}
}
public InhabitantParser next() {
fetch();
kvpp.set(nextLine);
nextLine=null;
return new InhabitantFileBasedParser(kvpp);
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public void close() throws IOException {
if (null != r) {
r.close();
r = null;
}
}
}