org.springframework.beans.factory.support.MethodOverrides.java Source code

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Here is the source code for org.springframework.beans.factory.support.MethodOverrides.java

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/*
 * Copyright 2002-2018 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.beans.factory.support;

import java.lang.reflect.Method;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

import org.springframework.lang.Nullable;

/**
 * Set of method overrides, determining which, if any, methods on a
 * managed object the Spring IoC container will override at runtime.
 *
 * <p>The currently supported {@link MethodOverride} variants are
 * {@link LookupOverride} and {@link ReplaceOverride}.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 1.1
 * @see MethodOverride
 */
public class MethodOverrides {

    private final Set<MethodOverride> overrides = Collections.synchronizedSet(new LinkedHashSet<>(2));

    private volatile boolean modified = false;

    /**
     * Create new MethodOverrides.
     */
    public MethodOverrides() {
    }

    /**
     * Deep copy constructor.
     */
    public MethodOverrides(MethodOverrides other) {
        addOverrides(other);
    }

    /**
     * Copy all given method overrides into this object.
     */
    public void addOverrides(@Nullable MethodOverrides other) {
        if (other != null) {
            this.modified = true;
            this.overrides.addAll(other.overrides);
        }
    }

    /**
     * Add the given method override.
     */
    public void addOverride(MethodOverride override) {
        this.modified = true;
        this.overrides.add(override);
    }

    /**
     * Return all method overrides contained by this object.
     * @return a Set of MethodOverride objects
     * @see MethodOverride
     */
    public Set<MethodOverride> getOverrides() {
        this.modified = true;
        return this.overrides;
    }

    /**
     * Return whether the set of method overrides is empty.
     */
    public boolean isEmpty() {
        return (!this.modified || this.overrides.isEmpty());
    }

    /**
     * Return the override for the given method, if any.
     * @param method method to check for overrides for
     * @return the method override, or {@code null} if none
     */
    @Nullable
    public MethodOverride getOverride(Method method) {
        if (!this.modified) {
            return null;
        }
        synchronized (this.overrides) {
            MethodOverride match = null;
            for (MethodOverride candidate : this.overrides) {
                if (candidate.matches(method)) {
                    match = candidate;
                }
            }
            return match;
        }
    }

    @Override
    public boolean equals(@Nullable Object other) {
        if (this == other) {
            return true;
        }
        if (!(other instanceof MethodOverrides)) {
            return false;
        }
        MethodOverrides that = (MethodOverrides) other;
        return this.overrides.equals(that.overrides);

    }

    @Override
    public int hashCode() {
        return this.overrides.hashCode();
    }

}