/*
 * Copyright 2002-2019 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
 *
 *      https://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.Serializable;

import org.springframework.aop.ClassFilter;
import org.springframework.aop.MethodMatcher;
import org.springframework.aop.Pointcut;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

Convenient class for building up pointcuts.
All methods return ComposablePointcut, so we can use concise idioms like in the following example. 
Pointcut pc = new ComposablePointcut()
                     .union(classFilter)
                     .intersection(methodMatcher)
                     .intersection(pointcut);
Author:
Rod Johnson, Juergen Hoeller, Rob Harrop
See Also:
Pointcuts
Since:
11.11.2003/**
 * Convenient class for building up pointcuts.
 *
 * <p>All methods return {@code ComposablePointcut}, so we can use concise idioms
 * like in the following example.
 *
 * <pre class="code">Pointcut pc = new ComposablePointcut()
 *                      .union(classFilter)
 *                      .intersection(methodMatcher)
 *                      .intersection(pointcut);</pre>
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Rob Harrop
 * @since 11.11.2003
 * @see Pointcuts
 */
public class ComposablePointcut implements Pointcut, Serializable {

	
use serialVersionUID from Spring 1.2 for interoperability. /** use serialVersionUID from Spring 1.2 for interoperability. */
	private static final long serialVersionUID = -2743223737633663832L;

	private ClassFilter classFilter;

	private MethodMatcher methodMatcher;


	
Create a default ComposablePointcut, with ClassFilter.TRUE and MethodMatcher.TRUE. /**
	 * Create a default ComposablePointcut, with {@code ClassFilter.TRUE}
	 * and {@code MethodMatcher.TRUE}.
	 */
	public ComposablePointcut() {
		this.classFilter = ClassFilter.TRUE;
		this.methodMatcher = MethodMatcher.TRUE;
	}

	
Create a ComposablePointcut based on the given Pointcut.
Params:
pointcut – the original Pointcut/**
	 * Create a ComposablePointcut based on the given Pointcut.
	 * @param pointcut the original Pointcut
	 */
	public ComposablePointcut(Pointcut pointcut) {
		Assert.notNull(pointcut, "Pointcut must not be null");
		this.classFilter = pointcut.getClassFilter();
		this.methodMatcher = pointcut.getMethodMatcher();
	}

	
Create a ComposablePointcut for the given ClassFilter, with MethodMatcher.TRUE. 
Params:
classFilter – the ClassFilter to use/**
	 * Create a ComposablePointcut for the given ClassFilter,
	 * with {@code MethodMatcher.TRUE}.
	 * @param classFilter the ClassFilter to use
	 */
	public ComposablePointcut(ClassFilter classFilter) {
		Assert.notNull(classFilter, "ClassFilter must not be null");
		this.classFilter = classFilter;
		this.methodMatcher = MethodMatcher.TRUE;
	}

	
Create a ComposablePointcut for the given MethodMatcher, with ClassFilter.TRUE. 
Params:
methodMatcher – the MethodMatcher to use/**
	 * Create a ComposablePointcut for the given MethodMatcher,
	 * with {@code ClassFilter.TRUE}.
	 * @param methodMatcher the MethodMatcher to use
	 */
	public ComposablePointcut(MethodMatcher methodMatcher) {
		Assert.notNull(methodMatcher, "MethodMatcher must not be null");
		this.classFilter = ClassFilter.TRUE;
		this.methodMatcher = methodMatcher;
	}

	
Create a ComposablePointcut for the given ClassFilter and MethodMatcher.
Params:
classFilter – the ClassFilter to use
methodMatcher – the MethodMatcher to use/**
	 * Create a ComposablePointcut for the given ClassFilter and MethodMatcher.
	 * @param classFilter the ClassFilter to use
	 * @param methodMatcher the MethodMatcher to use
	 */
	public ComposablePointcut(ClassFilter classFilter, MethodMatcher methodMatcher) {
		Assert.notNull(classFilter, "ClassFilter must not be null");
		Assert.notNull(methodMatcher, "MethodMatcher must not be null");
		this.classFilter = classFilter;
		this.methodMatcher = methodMatcher;
	}


	
Apply a union with the given ClassFilter.
Params:
other – the ClassFilter to apply a union with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply a union with the given ClassFilter.
	 * @param other the ClassFilter to apply a union with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut union(ClassFilter other) {
		this.classFilter = ClassFilters.union(this.classFilter, other);
		return this;
	}

	
Apply an intersection with the given ClassFilter.
Params:
other – the ClassFilter to apply an intersection with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply an intersection with the given ClassFilter.
	 * @param other the ClassFilter to apply an intersection with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut intersection(ClassFilter other) {
		this.classFilter = ClassFilters.intersection(this.classFilter, other);
		return this;
	}

	
Apply a union with the given MethodMatcher.
Params:
other – the MethodMatcher to apply a union with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply a union with the given MethodMatcher.
	 * @param other the MethodMatcher to apply a union with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut union(MethodMatcher other) {
		this.methodMatcher = MethodMatchers.union(this.methodMatcher, other);
		return this;
	}

	
Apply an intersection with the given MethodMatcher.
Params:
other – the MethodMatcher to apply an intersection with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply an intersection with the given MethodMatcher.
	 * @param other the MethodMatcher to apply an intersection with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut intersection(MethodMatcher other) {
		this.methodMatcher = MethodMatchers.intersection(this.methodMatcher, other);
		return this;
	}

	
Apply a union with the given Pointcut.
Note that for a Pointcut union, methods will only match if their
original ClassFilter (from the originating Pointcut) matches as well.
MethodMatchers and ClassFilters from different Pointcuts will never
get interleaved with each other.
Params:
other – the Pointcut to apply a union with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply a union with the given Pointcut.
	 * <p>Note that for a Pointcut union, methods will only match if their
	 * original ClassFilter (from the originating Pointcut) matches as well.
	 * MethodMatchers and ClassFilters from different Pointcuts will never
	 * get interleaved with each other.
	 * @param other the Pointcut to apply a union with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut union(Pointcut other) {
		this.methodMatcher = MethodMatchers.union(
				this.methodMatcher, this.classFilter, other.getMethodMatcher(), other.getClassFilter());
		this.classFilter = ClassFilters.union(this.classFilter, other.getClassFilter());
		return this;
	}

	
Apply an intersection with the given Pointcut.
Params:
other – the Pointcut to apply an intersection with
Returns:
this composable pointcut (for call chaining)/**
	 * Apply an intersection with the given Pointcut.
	 * @param other the Pointcut to apply an intersection with
	 * @return this composable pointcut (for call chaining)
	 */
	public ComposablePointcut intersection(Pointcut other) {
		this.classFilter = ClassFilters.intersection(this.classFilter, other.getClassFilter());
		this.methodMatcher = MethodMatchers.intersection(this.methodMatcher, other.getMethodMatcher());
		return this;
	}


	@Override
	public ClassFilter getClassFilter() {
		return this.classFilter;
	}

	@Override
	public MethodMatcher getMethodMatcher() {
		return this.methodMatcher;
	}

	@Override
	public boolean equals(@Nullable Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof ComposablePointcut)) {
			return false;
		}
		ComposablePointcut otherPointcut = (ComposablePointcut) other;
		return (this.classFilter.equals(otherPointcut.classFilter) &&
				this.methodMatcher.equals(otherPointcut.methodMatcher));
	}

	@Override
	public int hashCode() {
		return this.classFilter.hashCode() * 37 + this.methodMatcher.hashCode();
	}

	@Override
	public String toString() {
		return getClass().getName() + ": " + this.classFilter + ", " + this.methodMatcher;
	}

}