ReplaceStreams: allow multiple replacements strings

[fanfix.git] / src / be / nikiroo / utils / streams / ReplaceOutputStream.java

diff --git a/src/be/nikiroo/utils/streams/ReplaceOutputStream.java b/src/be/nikiroo/utils/streams/ReplaceOutputStream.java
index e889b76ef6b756c20ca1e2e9ecec561c45ea9a55..dcb020770e003379cd88953d27d4d8bd4bc625bb 100644 (file)
--- a/src/be/nikiroo/utils/streams/ReplaceOutputStream.java
+++ b/src/be/nikiroo/utils/streams/ReplaceOutputStream.java
@@ -10,8 +10,8 @@ import java.io.OutputStream;
  * @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
@@ -40,23 +40,76 @@ public class ReplaceOutputStream extends BufferedOutputStream {
         *            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.bytes(froms), StreamUtils.bytes(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;
        }
 
        @Override
        protected 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++;
                        }