- /*
- * Copyright 2002,2004 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;
- 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 final 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 final 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 final 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 final 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 final void initialize() {
- String userDefinedLineBreaks = null;
- Parameter[] params = getParameters();
- if (params != null) {
- for (int i = 0; i < params.length; i++) {
- if (LINE_BREAKS_KEY.equals(params[i].getName())) {
- userDefinedLineBreaks = params[i].getValue();
- break;
- }
- }
- }
- if (userDefinedLineBreaks != null) {
- lineBreaks = userDefinedLineBreaks;
- }
- }
- }