| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 void initialize() { |
| } |
| } |
| |