ReplaceStreams: allow multiple replacements strings

[nikiroo-utils.git] / src / be / nikiroo / utils / streams / ReplaceInputStream.java

diff --git a/src/be/nikiroo/utils/streams/ReplaceInputStream.java b/src/be/nikiroo/utils/streams/ReplaceInputStream.java
index f5138eefeafc327dbd865e3b89713843c027aa0a..eea3a1ab9b74b42158d5b40e565b59c839cb690a 100644 (file)
--- a/src/be/nikiroo/utils/streams/ReplaceInputStream.java
+++ b/src/be/nikiroo/utils/streams/ReplaceInputStream.java
@@ -10,8 +10,9 @@ import java.io.InputStream;
  * @author niki
  */
 public class ReplaceInputStream extends BufferedInputStream {
-       private byte[] from;
-       private byte[] to;
+       private byte[][] froms;
+       private byte[][] tos;
+       private int maxToSize;
 
        private byte[] source;
        private int spos;
@@ -44,9 +45,55 @@ public class ReplaceInputStream extends BufferedInputStream {
         *            the value to replace with
         */
        public ReplaceInputStream(InputStream in, byte[] from, byte[] to) {
+               this(in, new byte[][] { from }, new byte[][] { to });
+       }
+
+       /**
+        * Create a {@link ReplaceInputStream} 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 in
+        *            the under-laying {@link InputStream}
+        * @param froms
+        *            the values to replace
+        * @param tos
+        *            the values to replace with
+        */
+       public ReplaceInputStream(InputStream in, String[] froms, String[] tos) {
+               this(in, StreamUtils.bytes(froms), StreamUtils.bytes(tos));
+       }
+
+       /**
+        * Create a {@link ReplaceInputStream} 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 in
+        *            the under-laying {@link InputStream}
+        * @param froms
+        *            the values to replace
+        * @param tos
+        *            the values to replace with
+        */
+       public ReplaceInputStream(InputStream in, byte[][] froms, byte[][] tos) {
                super(in);
-               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;
+
+               for (int i = 0; i < tos.length; i++) {
+                       maxToSize = Math.max(maxToSize, tos[i].length);
+               }
 
                source = new byte[4096];
                spos = 0;
@@ -55,9 +102,9 @@ public class ReplaceInputStream extends BufferedInputStream {
 
        @Override
        protected int read(InputStream in, byte[] buffer) throws IOException {
-               if (buffer.length < to.length || source.length < to.length * 2) {
+               if (buffer.length < maxToSize || source.length < maxToSize * 2) {
                        throw new IOException(
-                                       "An underlaying buffer is too small for this replace value");
+                                       "An underlaying buffer is too small for these replace values");
                }
 
                if (spos >= slen) {
@@ -67,13 +114,23 @@ public class ReplaceInputStream extends BufferedInputStream {
 
                // Note: very simple, not efficient implementation, sorry.
                int count = 0;
-               while (spos < slen && count < buffer.length - to.length) {
-                       if (from.length > 0
-                                       && StreamUtils.startsWith(from, source, spos, slen)) {
-                               System.arraycopy(to, 0, buffer, spos, to.length);
-                               count += to.length;
-                               spos += from.length;
-                       } else {
+               while (spos < slen && count < buffer.length - maxToSize) {
+                       boolean replaced = false;
+                       for (int i = 0; i < froms.length; i++) {
+                               if (froms[i] != null && froms[i].length > 0
+                                               && StreamUtils.startsWith(froms[i], source, spos, slen)) {
+                                       if (tos[i] != null && tos[i].length > 0) {
+                                               System.arraycopy(tos[i], 0, buffer, spos, tos[i].length);
+                                               count += tos[i].length;
+                                       }
+
+                                       spos += froms[i].length;
+                                       replaced = true;
+                                       break;
+                               }
+                       }
+
+                       if (!replaced) {
                                buffer[count++] = source[spos++];
                        }
                }