umagesh 02/02/18 12:56:01
Added:
proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters
TabsToSpaces.java
Log:
Converts Tabs to Spaces.
Revision Changes Path
1.1
jakarta-ant/proposal/sandbox/filterreaders/src/main/org/apache/tools/ant/filters/TabsToSpaces.java
Index: TabsToSpaces.java
===================================================================
package org.apache.tools.ant.filters;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.util.Hashtable;
import org.apache.tools.ant.types.Parameter;
import org.apache.tools.ant.types.Parameterizable;
/**
* Converts tabs to spaces.
*
* Example Usage:
* =============
* <filterreader classname="org.apache.tools.ant.filters.TabsToSpaces">
* <param name="tablength" value="8"/>
* </filterreader>
*
* @author <a href="mailto:[EMAIL PROTECTED]">Magesh Umasankar</a>
*/
public final class TabsToSpaces
extends FilterReader
implements Parameterizable
{
private static final int DEFAULT_TAB_LENGTH = 8;
private static final String TAB_LENGTH_KEY = "tablength";
private Parameter[] parameters;
private boolean initialized;
private int tabLength = DEFAULT_TAB_LENGTH;
private int spacesRemaining = 0;
/**
* Create a new filtered reader.
*
* @param in a Reader object providing the underlying stream.
*/
public TabsToSpaces(final Reader in) {
super(in);
}
/**
* Convert tabs with spaces
*/
public final int read() throws IOException {
if (!initialized) {
initialize();
initialized = true;
}
int ch = -1;
if (spacesRemaining > 0) {
spacesRemaining--;
ch = ' ';
} else {
ch = in.read();
if (ch == '\t') {
spacesRemaining = tabLength - 1;
ch = ' ';
}
}
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;
}
/**
* Initialize tokens and load the replacee-replacer hashtable.
*/
private final void initialize() {
if (parameters != null) {
for (int i = 0; i < parameters.length; i++) {
if (parameters[i] != null) {
if (TAB_LENGTH_KEY.equals(parameters[i].getName())) {
tabLength =
new Integer(parameters[i].getValue()).intValue();
break;
}
}
}
}
}
}
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