- /*
- * Copyright 2003-2004 The Apache Software Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
- package org.apache.tools.ant.filters;
-
- import java.io.IOException;
- import java.io.Reader;
-
- /**
- * This method converts non-latin characters to unicode escapes.
- * Useful to load properties containing non latin
- * Example:
- *
- * <pre><escapeunicode></pre>
- *
- * Or:
- *
- * <pre><filterreader
- classname="org.apache.tools.ant.filters.EscapeUnicode"/>
- * </pre>
- *
- * @since Ant 1.6
- */
- public class EscapeUnicode
- extends BaseParamFilterReader
- implements ChainableReader {
- //this field will hold unnnn right after reading a non latin character
- //afterwards it will be truncated of one char every call to read
- private StringBuffer unicodeBuf;
-
- /**
- * Constructor for "dummy" instances.
- *
- * @see BaseFilterReader#BaseFilterReader()
- */
- public EscapeUnicode() {
- super();
- unicodeBuf = new StringBuffer();
- }
-
- /**
- * Creates a new filtered reader.
- *
- * @param in A Reader object providing the underlying stream.
- * Must not be <code>null</code>.
- */
- public EscapeUnicode(final Reader in) {
- super(in);
- unicodeBuf = new StringBuffer();
- }
-
- /**
- * Returns the next character in the filtered stream, converting non latin
- * characters to unicode escapes.
- *
- * @return the next character in the resulting stream, or -1
- * if the end of the resulting stream has been reached
- *
- * @exception IOException if the underlying stream throws
- * an IOException during reading
- */
- public final int read() throws IOException {
- if (!getInitialized()) {
- initialize();
- setInitialized(true);
- }
-
- int ch = -1;
- if (unicodeBuf.length() == 0) {
- ch = in.read();
- if (ch != -1) {
- char achar = (char) ch;
- if (achar >= '\u0080') {
- unicodeBuf = new StringBuffer("u0000");
- String s = Integer.toHexString(ch);
- //replace the last 0s by the chars contained in s
- for (int i = 0; i < s.length(); i++) {
- unicodeBuf.setCharAt(unicodeBuf.length()
- - s.length() + i,
- s.charAt(i));
- }
- ch = '\\';
- }
- }
- } else {
- ch = (int) unicodeBuf.charAt(0);
- unicodeBuf.deleteCharAt(0);
- }
- return ch;
- }
-
- /**
- * Creates a new EscapeUnicode using the passed in
- * Reader for instantiation.
- *
- * @param rdr A Reader object providing the underlying stream.
- * Must not be <code>null</code>.
- *
- * @return a new filter based on this configuration, but filtering
- * the specified reader
- */
- public final Reader chain(final Reader rdr) {
- EscapeUnicode newFilter = new EscapeUnicode(rdr);
- newFilter.setInitialized(true);
- return newFilter;
- }
-
- /**
- * Parses the parameters (currently unused)
- */
- private final void initialize() {
- }
- }
-