Ant example source code file (EscapeUnicode.java)

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Java - Ant tags/keywords

baseparamfilterreader, chainablereader, escapeunicode, escapeunicode, io, ioexception, ioexception, reader, reader, string, stringbuffer, stringbuffer

The EscapeUnicode.java source code

/*
 *  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>

* * 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. */ 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. * * @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() { } }