| /* |
| * 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; |
| |
| import org.apache.tools.ant.types.Parameter; |
| |
| /** |
| * Filter to flatten the stream to a single line. |
| * |
| * Example: |
| * |
| * <pre><striplinebreaks/></pre> |
| * |
| * Or: |
| * |
| * <pre><filterreader |
| * classname="org.apache.tools.ant.filters.StripLineBreaks"/></pre> |
| * |
| */ |
| public final class StripLineBreaks |
| extends BaseParamFilterReader |
| implements ChainableReader { |
| /** |
| * Line-breaking characters. |
| * What should we do on funny IBM mainframes with odd line endings? |
| */ |
| private static final String DEFAULT_LINE_BREAKS = "\r\n"; |
| |
| /** Parameter name for the line-breaking characters parameter. */ |
| private static final String LINE_BREAKS_KEY = "linebreaks"; |
| |
| /** The characters that are recognized as line breaks. */ |
| private String lineBreaks = DEFAULT_LINE_BREAKS; |
| |
| /** |
| * Constructor for "dummy" instances. |
| * |
| * @see BaseFilterReader#BaseFilterReader() |
| */ |
| public StripLineBreaks() { |
| super(); |
| } |
| |
| /** |
| * Creates a new filtered reader. |
| * |
| * @param in A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| */ |
| public StripLineBreaks(final Reader in) { |
| super(in); |
| } |
| |
| /** |
| * Returns the next character in the filtered stream, only including |
| * characters not in the set of line-breaking characters. |
| * |
| * @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 int read() throws IOException { |
| if (!getInitialized()) { |
| initialize(); |
| setInitialized(true); |
| } |
| |
| int ch = in.read(); |
| while (ch != -1) { |
| if (lineBreaks.indexOf(ch) == -1) { |
| break; |
| } else { |
| ch = in.read(); |
| } |
| } |
| return ch; |
| } |
| |
| /** |
| * Sets the line-breaking characters. |
| * |
| * @param lineBreaks A String containing all the characters to be |
| * considered as line-breaking. |
| */ |
| public void setLineBreaks(final String lineBreaks) { |
| this.lineBreaks = lineBreaks; |
| } |
| |
| /** |
| * Returns the line-breaking characters as a String. |
| * |
| * @return a String containing all the characters considered as |
| * line-breaking |
| */ |
| private String getLineBreaks() { |
| return lineBreaks; |
| } |
| |
| /** |
| * Creates a new StripLineBreaks 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 Reader chain(final Reader rdr) { |
| StripLineBreaks newFilter = new StripLineBreaks(rdr); |
| newFilter.setLineBreaks(getLineBreaks()); |
| newFilter.setInitialized(true); |
| return newFilter; |
| } |
| |
| /** |
| * Parses the parameters to set the line-breaking characters. |
| */ |
| private void initialize() { |
| String userDefinedLineBreaks = null; |
| Parameter[] params = getParameters(); |
| if (params != null) { |
| for (Parameter param : params) { |
| if (LINE_BREAKS_KEY.equals(param.getName())) { |
| userDefinedLineBreaks = param.getValue(); |
| break; |
| } |
| } |
| } |
| if (userDefinedLineBreaks != null) { |
| lineBreaks = userDefinedLineBreaks; |
| } |
| } |
| } |