X-Git-Url: http://git.nikiroo.be/?p=fanfix.git;a=blobdiff_plain;f=src%2Fbe%2Fnikiroo%2Futils%2Fstreams%2FReplaceOutputStream.java;fp=src%2Fbe%2Fnikiroo%2Futils%2Fstreams%2FReplaceOutputStream.java;h=c6679cc3b3eef4ad15e50e022013663c3b75dade;hp=0000000000000000000000000000000000000000;hb=d46b7b96f94e88a776bcd2dfd756549ffb300cc9;hpb=c9994f27667bc421bcd448d39e55774fddf5c431

diff --git a/src/be/nikiroo/utils/streams/ReplaceOutputStream.java b/src/be/nikiroo/utils/streams/ReplaceOutputStream.java
new file mode 100644
index 0000000..c6679cc
--- /dev/null
+++ b/src/be/nikiroo/utils/streams/ReplaceOutputStream.java
@@ -0,0 +1,148 @@
+package be.nikiroo.utils.streams;
+
+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[][] froms;
+	private byte[][] tos;
+
+	/**
+	 * Create a {@link ReplaceOutputStream} that will replace <tt>from</tt> with
+	 * <tt>to</tt>.
+	 * 
+	 * @param out
+	 *            the under-laying {@link OutputStream}
+	 * @param from
+	 *            the {@link String} to replace
+	 * @param to
+	 *            the {@link String} to replace with
+	 */
+	public ReplaceOutputStream(OutputStream out, String from, String to) {
+		this(out, StringUtils.getBytes(from), StringUtils.getBytes(to));
+	}
+
+	/**
+	 * Create a {@link ReplaceOutputStream} that will replace <tt>from</tt> with
+	 * <tt>to</tt>.
+	 * 
+	 * @param out
+	 *            the under-laying {@link OutputStream}
+	 * @param from
+	 *            the value to replace
+	 * @param 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;
+
+		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
+	public void flush(boolean includingSubStream) throws IOException {
+		// Note: very simple, not efficient implementation; sorry.
+		while (start < stop) {
+			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++;
+			}
+		}
+
+		start = 0;
+		stop = 0;
+
+		if (includingSubStream) {
+			out.flush();
+		}
+	}
+}