umagesh 02/02/22 19:28:04
Added:
proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters
PrefixLines.java
Log:
A filter that attaches a prefix to every line of data read.
Revision Changes Path
1.1
jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters/PrefixLines.java
Index: PrefixLines.java
===================================================================
package org.apache.tools.ant.filters;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import org.apache.tools.ant.types.Parameter;
import org.apache.tools.ant.types.Parameterizable;
/**
* Attach a prefix to every line
*
* @author <a href="mailto:[EMAIL PROTECTED]">Magesh Umasankar</a>
*/
public final class PrefixLines
extends FilterReader
implements Parameterizable
{
/**
* prefix key
*/
private static final String PREFIX_KEY = "prefix";
private Parameter[] parameters;
private boolean initialized = false;
private String prefix = null;
private String queuedData = null;
/**
* Create a new filtered reader.
*
* @param in a Reader object providing the underlying stream.
*/
public PrefixLines(final Reader in) {
super(in);
}
public final int read() throws IOException {
if (!initialized) {
initialize();
initialized = true;
}
int ch = -1;
if (queuedData != null) {
if (queuedData.length() == 0) {
queuedData = null;
} else {
ch = queuedData.charAt(0);
queuedData = queuedData.substring(1);
}
} else {
ch = in.read();
while (ch != -1) {
if (queuedData == null) {
if (prefix != null) {
queuedData = prefix;
} else {
queuedData = "";
}
}
queuedData += (char) ch;
if (ch == '\n') {
break;
}
ch = in.read();
}
if (queuedData != null) {
return read();
}
}
return ch;
}
public final int read(final char cbuf[], final int off,
final int len) throws IOException {
for (int i = 0; i < len; i++) {
final int ch = read();
if (ch == -1) {
if (i == 0) {
return -1;
} else {
return i;
}
}
cbuf[off + i] = (char) ch;
}
return len;
}
public final long skip(long n) throws IOException {
for (long i = 0; i < n; i++) {
if (in.read() == -1) {
return i;
}
}
return n;
}
/**
* Set Parameters
*/
public final void setParameters(final Parameter[] parameters) {
this.parameters = parameters;
initialized = false;
}
private final void initialize() {
if (parameters != null) {
for (int i = 0; i < parameters.length; i++) {
if (PREFIX_KEY.equals(parameters[i].getName())) {
prefix = parameters[i].getValue();
break;
}
}
}
}
}
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