org.springframework.beans.PropertyValues.java Source code

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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;

import java.util.Arrays;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

import org.springframework.lang.Nullable;

/**
 * Holder containing one or more {@link PropertyValue} objects,
 * typically comprising one update for a specific target bean.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 13 May 2001
 * @see PropertyValue
 */
public interface PropertyValues extends Iterable<PropertyValue> {

    /**
     * Return an {@link Iterator} over the property values.
     * @since 5.1
     */
    @Override
    default Iterator<PropertyValue> iterator() {
        return Arrays.asList(getPropertyValues()).iterator();
    }

    /**
     * Return a {@link Spliterator} over the property values.
     * @since 5.1
     */
    @Override
    default Spliterator<PropertyValue> spliterator() {
        return Spliterators.spliterator(getPropertyValues(), 0);
    }

    /**
     * Return a sequential {@link Stream} containing the property values.
     * @since 5.1
     */
    default Stream<PropertyValue> stream() {
        return StreamSupport.stream(spliterator(), false);
    }

    /**
     * Return an array of the PropertyValue objects held in this object.
     */
    PropertyValue[] getPropertyValues();

    /**
     * Return the property value with the given name, if any.
     * @param propertyName the name to search for
     * @return the property value, or {@code null} if none
     */
    @Nullable
    PropertyValue getPropertyValue(String propertyName);

    /**
     * Return the changes since the previous PropertyValues.
     * Subclasses should also override {@code equals}.
     * @param old old property values
     * @return the updated or new properties.
     * Return empty PropertyValues if there are no changes.
     * @see Object#equals
     */
    PropertyValues changesSince(PropertyValues old);

    /**
     * Is there a property value (or other processing entry) for this property?
     * @param propertyName the name of the property we're interested in
     * @return whether there is a property value for this property
     */
    boolean contains(String propertyName);

    /**
     * Does this holder not contain any PropertyValue objects at all?
     */
    boolean isEmpty();

}