| /* |
| * 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 java.util.Vector; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.types.Parameter; |
| import org.apache.tools.ant.types.RegularExpression; |
| import org.apache.tools.ant.util.regexp.Regexp; |
| |
| /** |
| * Filter which includes only those lines that contain the user-specified |
| * regular expression matching strings. |
| * |
| * Example: |
| * <pre><linecontainsregexp> |
| * <regexp pattern="foo*"> |
| * </linecontainsregexp></pre> |
| * |
| * Or: |
| * |
| * <pre><filterreader classname="org.apache.tools.ant.filters.LineContainsRegExp"> |
| * <param type="regexp" value="foo*"/> |
| * </filterreader></pre> |
| * |
| * This will fetch all those lines that contain the pattern <code>foo</code> |
| * |
| */ |
| public final class LineContainsRegExp |
| extends BaseParamFilterReader |
| implements ChainableReader { |
| /** Parameter name for the regular expression to filter on. */ |
| private static final String REGEXP_KEY = "regexp"; |
| |
| /** Parameter name for the words to filter on. */ |
| private static final String NEGATE_KEY = "negate"; |
| |
| /** Vector that holds the expressions that input lines must contain. */ |
| private Vector regexps = new Vector(); |
| |
| /** |
| * Remaining line to be read from this filter, or <code>null</code> if |
| * the next call to <code>read()</code> should read the original stream |
| * to find the next matching line. |
| */ |
| private String line = null; |
| |
| private boolean negate = false; |
| |
| /** |
| * Constructor for "dummy" instances. |
| * |
| * @see BaseFilterReader#BaseFilterReader() |
| */ |
| public LineContainsRegExp() { |
| super(); |
| } |
| |
| /** |
| * Creates a new filtered reader. |
| * |
| * @param in A Reader object providing the underlying stream. |
| * Must not be <code>null</code>. |
| */ |
| public LineContainsRegExp(final Reader in) { |
| super(in); |
| } |
| |
| /** |
| * Returns the next character in the filtered stream, only including |
| * lines from the original stream which match all of the specified |
| * regular expressions. |
| * |
| * @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 = -1; |
| |
| if (line != null) { |
| ch = line.charAt(0); |
| if (line.length() == 1) { |
| line = null; |
| } else { |
| line = line.substring(1); |
| } |
| } else { |
| final int regexpsSize = regexps.size(); |
| |
| for (line = readLine(); line != null; line = readLine()) { |
| boolean matches = true; |
| for (int i = 0; matches && i < regexpsSize; i++) { |
| RegularExpression regexp |
| = (RegularExpression) regexps.elementAt(i); |
| Regexp re = regexp.getRegexp(getProject()); |
| matches = re.matches(line); |
| } |
| if (matches ^ isNegated()) { |
| break; |
| } |
| } |
| if (line != null) { |
| return read(); |
| } |
| } |
| return ch; |
| } |
| |
| /** |
| * Adds a <code>regexp</code> element. |
| * |
| * @param regExp The <code>regexp</code> element to add. |
| * Must not be <code>null</code>. |
| */ |
| public void addConfiguredRegexp(final RegularExpression regExp) { |
| this.regexps.addElement(regExp); |
| } |
| |
| /** |
| * Sets the vector of regular expressions which must be contained within |
| * a line read from the original stream in order for it to match this |
| * filter. |
| * |
| * @param regexps A vector of regular expressions which must be contained |
| * within a line in order for it to match in this filter. Must not be |
| * <code>null</code>. |
| */ |
| private void setRegexps(final Vector regexps) { |
| this.regexps = regexps; |
| } |
| |
| /** |
| * Returns the vector of regular expressions which must be contained within |
| * a line read from the original stream in order for it to match this |
| * filter. |
| * |
| * @return the vector of regular expressions which must be contained within |
| * a line read from the original stream in order for it to match this |
| * filter. The returned object is "live" - in other words, changes made to |
| * the returned object are mirrored in the filter. |
| */ |
| private Vector getRegexps() { |
| return regexps; |
| } |
| |
| /** |
| * Creates a new LineContainsRegExp 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) { |
| LineContainsRegExp newFilter = new LineContainsRegExp(rdr); |
| newFilter.setRegexps(getRegexps()); |
| newFilter.setNegate(isNegated()); |
| return newFilter; |
| } |
| |
| /** |
| * Set the negation mode. Default false (no negation). |
| * @param b the boolean negation mode to set. |
| */ |
| public void setNegate(boolean b) { |
| negate = b; |
| } |
| |
| /** |
| * Find out whether we have been negated. |
| * @return boolean negation flag. |
| */ |
| public boolean isNegated() { |
| return negate; |
| } |
| |
| /** |
| * Parses parameters to add user defined regular expressions. |
| */ |
| private void initialize() { |
| Parameter[] params = getParameters(); |
| if (params != null) { |
| for (int i = 0; i < params.length; i++) { |
| if (REGEXP_KEY.equals(params[i].getType())) { |
| String pattern = params[i].getValue(); |
| RegularExpression regexp = new RegularExpression(); |
| regexp.setPattern(pattern); |
| regexps.addElement(regexp); |
| } else if (NEGATE_KEY.equals(params[i].getType())) { |
| setNegate(Project.toBoolean(params[i].getValue())); |
| } |
| } |
| } |
| } |
| } |