/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.aop.support;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Arrays;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Abstract base regular expression pointcut bean. JavaBean properties are:
* <ul>
* <li>pattern: regular expression for the fully-qualified method names to match.
* The exact regexp syntax will depend on the subclass (e.g. Perl5 regular expressions)
* <li>patterns: alternative property taking a String array of patterns. The result will
* be the union of these patterns.
* </ul>
*
* <p>Note: the regular expressions must be a match. For example,
* <code>.*get.*</code> will match com.mycom.Foo.getBar().
* <code>get.*</code> will not.
*
* <p>This base class is serializable. Subclasses should declare all fields transient
* - the initPatternRepresentation method in this class will be invoked again on the
* client side on deserialization.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rob Harrop
* @since 1.1
* @see JdkRegexpMethodPointcut
*/
public abstract class AbstractRegexpMethodPointcut extends StaticMethodMatcherPointcut
implements Serializable {
/** Regular expressions to match */
private String[] patterns = new String[0];
/** Regaular expressions <strong>not</strong> to match */
private String[] excludedPatterns = new String[0];
/**
* Convenience method when we have only a single pattern.
* Use either this method or {@link #setPatterns}, not both.
* @see #setPatterns
*/
public void setPattern(String pattern) {
setPatterns(new String[] {pattern});
}
/**
* Set the regular expressions defining methods to match.
* Matching will be the union of all these; if any match,
* the pointcut matches.
*/
public void setPatterns(String[] patterns) {
Assert.notEmpty(patterns, "'patterns' must not be empty");
this.patterns = new String[patterns.length];
for (int i = 0; i < patterns.length; i++) {
this.patterns[i] = StringUtils.trimWhitespace(patterns[i]);
}
initPatternRepresentation(this.patterns);
}
/**
* Return the regular expressions for method matching.
*/
public String[] getPatterns() {
return this.patterns;
}
/**
* Convenience method when we have only a single exclusion pattern.
* Use either this method or {@link #setExcludedPatterns}, not both.
* @see #setExcludedPatterns
*/
public void setExcludedPattern(String excludedPattern) {
setExcludedPatterns(new String[] {excludedPattern});
}
/**
* Set the regular expressions defining methods to match for exclusion.
* Matching will be the union of all these; if any match,
* the pointcut matches.
*/
public void setExcludedPatterns(String[] excludedPatterns) {
Assert.notEmpty(excludedPatterns, "'excludedPatterns' must not be empty");
this.excludedPatterns = new String[excludedPatterns.length];
for (int i = 0; i < excludedPatterns.length; i++) {
this.excludedPatterns[i] = StringUtils.trimWhitespace(excludedPatterns[i]);
}
initExcludedPatternRepresentation(this.excludedPatterns);
}
/**
* Returns the regular expressions for exclusion matching.
*/
public String[] getExcludedPatterns() {
return this.excludedPatterns;
}
/**
* Try to match the regular expression against the fully qualified name
* of the target class as well as against the method's declaring class,
* plus the name of the method.
*/
public boolean matches(Method method, Class targetClass) {
return ((targetClass != null && matchesPattern(targetClass.getName() + "." + method.getName())) ||
matchesPattern(method.getDeclaringClass().getName() + "." + method.getName()));
}
/**
* Match the specified candidate against the configured patterns.
* @param signatureString "java.lang.Object.hashCode" style signature
* @return whether the candidate matches at least one of the specified patterns
*/
protected boolean matchesPattern(String signatureString) {
for (int i = 0; i < this.patterns.length; i++) {
boolean matched = matches(signatureString, i);
if (matched) {
for (int j = 0; j < this.excludedPatterns.length; j++) {
boolean excluded = matchesExclusion(signatureString, j);
if (excluded) {
return false;
}
}
return true;
}
}
return false;
}
/**
* Subclasses must implement this to initialize regexp pointcuts.
* Can be invoked multiple times.
* <p>This method will be invoked from the {@link #setPatterns} method,
* and also on deserialization.
* @param patterns the patterns to initialize
* @throws IllegalArgumentException in case of an invalid pattern
*/
protected abstract void initPatternRepresentation(String[] patterns) throws IllegalArgumentException;
/**
* Subclasses must implement this to initialize regexp pointcuts.
* Can be invoked multiple times.
* <p>This method will be invoked from the {@link #setExcludedPatterns} method,
* and also on deserialization.
* @param patterns the patterns to initialize
* @throws IllegalArgumentException in case of an invalid pattern
*/
protected abstract void initExcludedPatternRepresentation(String[] patterns) throws IllegalArgumentException;
/**
* Does the pattern at the given index match this string?
* @param pattern <code>String</code> pattern to match
* @param patternIndex index of pattern from 0
* @return <code>true</code> if there is a match, else <code>false</code>.
*/
protected abstract boolean matches(String pattern, int patternIndex);
/**
* Does the exclusion pattern at the given index match this string?
* @param pattern <code>String</code> pattern to match.
* @param patternIndex index of pattern starting from 0.
* @return <code>true</code> if there is a match, else <code>false</code>.
*/
protected abstract boolean matchesExclusion(String pattern, int patternIndex);
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof AbstractRegexpMethodPointcut)) {
return false;
}
AbstractRegexpMethodPointcut otherPointcut = (AbstractRegexpMethodPointcut) other;
return (Arrays.equals(this.patterns, otherPointcut.patterns) &&
Arrays.equals(this.excludedPatterns, otherPointcut.excludedPatterns));
}
public int hashCode() {
int result = 27;
for (int i = 0; i < this.patterns.length; i++) {
String pattern = this.patterns[i];
result = 13 * result + pattern.hashCode();
}
for (int i = 0; i < this.excludedPatterns.length; i++) {
String excludedPattern = this.excludedPatterns[i];
result = 13 * result + excludedPattern.hashCode();
}
return result;
}
public String toString() {
return getClass().getName() + ": patterns " + ObjectUtils.nullSafeToString(this.patterns) +
", excluded patterns " + ObjectUtils.nullSafeToString(this.excludedPatterns);
}
}