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/*
* 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.types;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.util.regexp.Regexp;
import org.apache.tools.ant.util.regexp.RegexpFactory;
/**
* A regular expression datatype. Keeps an instance of the
* compiled expression for speed purposes. This compiled
* expression is lazily evaluated (it is compiled the first
* time it is needed). The syntax is the dependent on which
* regular expression type you are using. The system property
* "ant.regexp.regexpimpl" will be the classname of the implementation
* that will be used.
*
* <pre>
* Available implementations:
*
* org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp (default)
* Based on the JDK's built-in regular expression package
*
* org.apache.tools.ant.util.regexp.JakartaOroRegexp
* Based on the jakarta-oro package
*
* org.apache.tools.ant.util.regexp.JakartaRegexpRegexp
* Based on the jakarta-regexp package
* </pre>
*
* <pre>
* <regexp [ [id="id"] pattern="expression" | refid="id" ]
* />
* </pre>
*
* @see org.apache.oro.text.regex.Perl5Compiler
* @see org.apache.regexp.RE
* @see java.util.regex.Pattern
*
* @see org.apache.tools.ant.util.regexp.Regexp
*
* @ant.datatype name="regexp"
*/
public class RegularExpression extends DataType {
/** Name of this data type */
public static final String DATA_TYPE_NAME = "regexp";
private boolean alreadyInit = false;
// The regular expression factory
private static final RegexpFactory FACTORY = new RegexpFactory();
private Regexp regexp = null;
// temporary variable
private String myPattern;
private boolean setPatternPending = false;
/**
* default constructor
*/
public RegularExpression() {
}
private void init(Project p) {
if (!alreadyInit) {
this.regexp = FACTORY.newRegexp(p);
alreadyInit = true;
}
}
private void setPattern() {
if (setPatternPending) {
regexp.setPattern(myPattern);
setPatternPending = false;
}
}
/**
* sets the regular expression pattern
* @param pattern regular expression pattern
*/
public void setPattern(String pattern) {
if (regexp == null) {
myPattern = pattern;
setPatternPending = true;
} else {
regexp.setPattern(pattern);
}
}
/***
* Gets the pattern string for this RegularExpression in the
* given project.
* @param p project
* @return pattern
*/
public String getPattern(Project p) {
init(p);
if (isReference()) {
return getRef(p).getPattern(p);
}
setPattern();
return regexp.getPattern();
}
/**
* provides a reference to the Regexp contained in this
* @param p project
* @return Regexp instance associated with this RegularExpression instance
*/
public Regexp getRegexp(Project p) {
init(p);
if (isReference()) {
return getRef(p).getRegexp(p);
}
setPattern();
return this.regexp;
}
/***
* Get the RegularExpression this reference refers to in
* the given project. Check for circular references too
* @param p project
* @return resolved RegularExpression instance
*/
public RegularExpression getRef(Project p) {
return (RegularExpression) getCheckedRef(p);
}
}
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