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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.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;

import org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;

/**
 * The default implementation of the {@link PropertyValues} interface.
 * Allows simple manipulation of properties, and provides constructors
 * to support deep copy and construction from a Map.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Rob Harrop
 * @since 13 May 2001
 */
@SuppressWarnings("serial")
public class MutablePropertyValues implements PropertyValues, Serializable {

	private final List propertyValueList;

	@Nullable
	private Set processedProperties;

	private volatile boolean converted = false;


	/**
	 * Creates a new empty MutablePropertyValues object.
	 * 

Property values can be added with the {@code add} method. * @see #add(String, Object) */ public MutablePropertyValues() { this.propertyValueList = new ArrayList<>(0); } /** * Deep copy constructor. Guarantees PropertyValue references * are independent, although it can't deep copy objects currently * referenced by individual PropertyValue objects. * @param original the PropertyValues to copy * @see #addPropertyValues(PropertyValues) */ public MutablePropertyValues(@Nullable PropertyValues original) { // We can optimize this because it's all new: // There is no replacement of existing property values. if (original != null) { PropertyValue[] pvs = original.getPropertyValues(); this.propertyValueList = new ArrayList<>(pvs.length); for (PropertyValue pv : pvs) { this.propertyValueList.add(new PropertyValue(pv)); } } else { this.propertyValueList = new ArrayList<>(0); } } /** * Construct a new MutablePropertyValues object from a Map. * @param original a Map with property values keyed by property name Strings * @see #addPropertyValues(Map) */ public MutablePropertyValues(@Nullable Map original) { // We can optimize this because it's all new: // There is no replacement of existing property values. if (original != null) { this.propertyValueList = new ArrayList<>(original.size()); original.forEach((attrName, attrValue) -> this.propertyValueList.add( new PropertyValue(attrName.toString(), attrValue))); } else { this.propertyValueList = new ArrayList<>(0); } } /** * Construct a new MutablePropertyValues object using the given List of * PropertyValue objects as-is. *

This is a constructor for advanced usage scenarios. * It is not intended for typical programmatic use. * @param propertyValueList a List of PropertyValue objects */ public MutablePropertyValues(@Nullable List propertyValueList) { this.propertyValueList = (propertyValueList != null ? propertyValueList : new ArrayList<>()); } /** * Return the underlying List of PropertyValue objects in its raw form. * The returned List can be modified directly, although this is not recommended. *

This is an accessor for optimized access to all PropertyValue objects. * It is not intended for typical programmatic use. */ public List getPropertyValueList() { return this.propertyValueList; } /** * Return the number of PropertyValue entries in the list. */ public int size() { return this.propertyValueList.size(); } /** * Copy all given PropertyValues into this object. Guarantees PropertyValue * references are independent, although it can't deep copy objects currently * referenced by individual PropertyValue objects. * @param other the PropertyValues to copy * @return this in order to allow for adding multiple property values in a chain */ public MutablePropertyValues addPropertyValues(@Nullable PropertyValues other) { if (other != null) { PropertyValue[] pvs = other.getPropertyValues(); for (PropertyValue pv : pvs) { addPropertyValue(new PropertyValue(pv)); } } return this; } /** * Add all property values from the given Map. * @param other a Map with property values keyed by property name, * which must be a String * @return this in order to allow for adding multiple property values in a chain */ public MutablePropertyValues addPropertyValues(@Nullable Map other) { if (other != null) { other.forEach((attrName, attrValue) -> addPropertyValue( new PropertyValue(attrName.toString(), attrValue))); } return this; } /** * Add a PropertyValue object, replacing any existing one for the * corresponding property or getting merged with it (if applicable). * @param pv the PropertyValue object to add * @return this in order to allow for adding multiple property values in a chain */ public MutablePropertyValues addPropertyValue(PropertyValue pv) { for (int i = 0; i < this.propertyValueList.size(); i++) { PropertyValue currentPv = this.propertyValueList.get(i); if (currentPv.getName().equals(pv.getName())) { pv = mergeIfRequired(pv, currentPv); setPropertyValueAt(pv, i); return this; } } this.propertyValueList.add(pv); return this; } /** * Overloaded version of {@code addPropertyValue} that takes * a property name and a property value. *

Note: As of Spring 3.0, we recommend using the more concise * and chaining-capable variant {@link #add}. * @param propertyName name of the property * @param propertyValue value of the property * @see #addPropertyValue(PropertyValue) */ public void addPropertyValue(String propertyName, Object propertyValue) { addPropertyValue(new PropertyValue(propertyName, propertyValue)); } /** * Add a PropertyValue object, replacing any existing one for the * corresponding property or getting merged with it (if applicable). * @param propertyName name of the property * @param propertyValue value of the property * @return this in order to allow for adding multiple property values in a chain */ public MutablePropertyValues add(String propertyName, @Nullable Object propertyValue) { addPropertyValue(new PropertyValue(propertyName, propertyValue)); return this; } /** * Modify a PropertyValue object held in this object. * Indexed from 0. */ public void setPropertyValueAt(PropertyValue pv, int i) { this.propertyValueList.set(i, pv); } /** * Merges the value of the supplied 'new' {@link PropertyValue} with that of * the current {@link PropertyValue} if merging is supported and enabled. * @see Mergeable */ private PropertyValue mergeIfRequired(PropertyValue newPv, PropertyValue currentPv) { Object value = newPv.getValue(); if (value instanceof Mergeable) { Mergeable mergeable = (Mergeable) value; if (mergeable.isMergeEnabled()) { Object merged = mergeable.merge(currentPv.getValue()); return new PropertyValue(newPv.getName(), merged); } } return newPv; } /** * Remove the given PropertyValue, if contained. * @param pv the PropertyValue to remove */ public void removePropertyValue(PropertyValue pv) { this.propertyValueList.remove(pv); } /** * Overloaded version of {@code removePropertyValue} that takes a property name. * @param propertyName name of the property * @see #removePropertyValue(PropertyValue) */ public void removePropertyValue(String propertyName) { this.propertyValueList.remove(getPropertyValue(propertyName)); } @Override public Iterator iterator() { return Collections.unmodifiableList(this.propertyValueList).iterator(); } @Override public Spliterator spliterator() { return Spliterators.spliterator(this.propertyValueList, 0); } @Override public Stream stream() { return this.propertyValueList.stream(); } @Override public PropertyValue[] getPropertyValues() { return this.propertyValueList.toArray(new PropertyValue[0]); } @Override @Nullable public PropertyValue getPropertyValue(String propertyName) { for (PropertyValue pv : this.propertyValueList) { if (pv.getName().equals(propertyName)) { return pv; } } return null; } /** * Get the raw property value, if any. * @param propertyName the name to search for * @return the raw property value, or {@code null} if none found * @since 4.0 * @see #getPropertyValue(String) * @see PropertyValue#getValue() */ @Nullable public Object get(String propertyName) { PropertyValue pv = getPropertyValue(propertyName); return (pv != null ? pv.getValue() : null); } @Override public PropertyValues changesSince(PropertyValues old) { MutablePropertyValues changes = new MutablePropertyValues(); if (old == this) { return changes; } // for each property value in the new set for (PropertyValue newPv : this.propertyValueList) { // if there wasn't an old one, add it PropertyValue pvOld = old.getPropertyValue(newPv.getName()); if (pvOld == null || !pvOld.equals(newPv)) { changes.addPropertyValue(newPv); } } return changes; } @Override public boolean contains(String propertyName) { return (getPropertyValue(propertyName) != null || (this.processedProperties != null && this.processedProperties.contains(propertyName))); } @Override public boolean isEmpty() { return this.propertyValueList.isEmpty(); } /** * Register the specified property as "processed" in the sense * of some processor calling the corresponding setter method * outside of the PropertyValue(s) mechanism. *

This will lead to {@code true} being returned from * a {@link #contains} call for the specified property. * @param propertyName the name of the property. */ public void registerProcessedProperty(String propertyName) { if (this.processedProperties == null) { this.processedProperties = new HashSet<>(4); } this.processedProperties.add(propertyName); } /** * Clear the "processed" registration of the given property, if any. * @since 3.2.13 */ public void clearProcessedProperty(String propertyName) { if (this.processedProperties != null) { this.processedProperties.remove(propertyName); } } /** * Mark this holder as containing converted values only * (i.e. no runtime resolution needed anymore). */ public void setConverted() { this.converted = true; } /** * Return whether this holder contains converted values only ({@code true}), * or whether the values still need to be converted ({@code false}). */ public boolean isConverted() { return this.converted; } @Override public boolean equals(@Nullable Object other) { return (this == other || (other instanceof MutablePropertyValues && this.propertyValueList.equals(((MutablePropertyValues) other).propertyValueList))); } @Override public int hashCode() { return this.propertyValueList.hashCode(); } @Override public String toString() { PropertyValue[] pvs = getPropertyValues(); if (pvs.length > 0) { return "PropertyValues: length=" + pvs.length + "; " + StringUtils.arrayToDelimitedString(pvs, "; "); } return "PropertyValues: length=0"; } }





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