import java.io.IOException;
import java.io.OutputStream;
+import be.nikiroo.utils.StringUtils;
+
/**
* This {@link OutputStream} will change some of its content by replacing it
* with something else.
* @author niki
*/
public class ReplaceOutputStream extends BufferedOutputStream {
- private byte[] from;
- private byte[] to;
+ private byte[][] froms;
+ private byte[][] tos;
/**
* Create a {@link ReplaceOutputStream} that will replace <tt>from</tt> with
* the {@link String} to replace with
*/
public ReplaceOutputStream(OutputStream out, String from, String to) {
- this(out, StreamUtils.bytes(from), StreamUtils.bytes(to));
+ this(out, StringUtils.getBytes(from), StringUtils.getBytes(to));
}
/**
* the value to replace with
*/
public ReplaceOutputStream(OutputStream out, byte[] from, byte[] to) {
+ this(out, new byte[][] { from }, new byte[][] { to });
+ }
+
+ /**
+ * Create a {@link ReplaceOutputStream} that will replace all <tt>froms</tt>
+ * with <tt>tos</tt>.
+ * <p>
+ * Note that they will be replaced in order, and that for each <tt>from</tt>
+ * a <tt>to</tt> must correspond.
+ *
+ * @param out
+ * the under-laying {@link OutputStream}
+ * @param froms
+ * the values to replace
+ * @param tos
+ * the values to replace with
+ */
+ public ReplaceOutputStream(OutputStream out, String[] froms, String[] tos) {
+ this(out, StreamUtils.getBytes(froms), StreamUtils.getBytes(tos));
+ }
+
+ /**
+ * Create a {@link ReplaceOutputStream} that will replace all <tt>froms</tt>
+ * with <tt>tos</tt>.
+ * <p>
+ * Note that they will be replaced in order, and that for each <tt>from</tt>
+ * a <tt>to</tt> must correspond.
+ *
+ * @param out
+ * the under-laying {@link OutputStream}
+ * @param froms
+ * the values to replace
+ * @param tos
+ * the values to replace with
+ */
+ public ReplaceOutputStream(OutputStream out, byte[][] froms, byte[][] tos) {
super(out);
bypassFlush = false;
- this.from = from;
- this.to = to;
+ if (froms.length != tos.length) {
+ throw new IllegalArgumentException(
+ "For replacing, each FROM must have a corresponding TO");
+ }
+
+ this.froms = froms;
+ this.tos = tos;
}
+ /**
+ * Flush the {@link BufferedOutputStream}, write the current buffered data
+ * to (and optionally also flush) the under-laying stream.
+ * <p>
+ * If {@link BufferedOutputStream#bypassFlush} is false, all writes to the
+ * under-laying stream are done in this method.
+ * <p>
+ * This can be used if you want to write some data in the under-laying
+ * stream yourself (in that case, flush this {@link BufferedOutputStream}
+ * with or without flushing the under-laying stream, then you can write to
+ * the under-laying stream).
+ * <p>
+ * <b>But be careful!</b> If a replacement could be done with the end o the
+ * currently buffered data and the start of the data to come, we obviously
+ * will not be able to do it.
+ *
+ * @param includingSubStream
+ * also flush the under-laying stream
+ * @throws IOException
+ * in case of I/O error
+ */
@Override
- protected void flush(boolean includingSubStream) throws IOException {
- // Note: very simple, not efficient implementation, sorry.
+ public void flush(boolean includingSubStream) throws IOException {
+ // Note: very simple, not efficient implementation; sorry.
while (start < stop) {
- if (from.length > 0
- && StreamUtils.startsWith(from, buffer, start, stop)) {
- out.write(to);
- bytesWritten += to.length;
- start += from.length;
- } else {
+ boolean replaced = false;
+ for (int i = 0; i < froms.length; i++) {
+ if (froms[i] != null
+ && froms[i].length > 0
+ && StreamUtils
+ .startsWith(froms[i], buffer, start, stop)) {
+ if (tos[i] != null && tos[i].length > 0) {
+ out.write(tos[i]);
+ bytesWritten += tos[i].length;
+ }
+
+ start += froms[i].length;
+ replaced = true;
+ break;
+ }
+ }
+
+ if (!replaced) {
out.write(buffer[start++]);
bytesWritten++;
}