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Consistent Iterator/Stream support in PropertySources and PropertyValues

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Issue: SPR-16894
This commit is contained in:
Juergen Hoeller
2018-07-05 23:59:56 +02:00
parent bb3061d112
commit d8c7270c00
7 changed files with 194 additions and 18 deletions
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22
spring-beans/src/main/java/org/springframework/beans/MutablePropertyValues.java
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@@ -18,16 +18,21 @@ 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;
/**
* Default implementation of the {@link PropertyValues} interface.
* 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.
*
@@ -244,6 +249,21 @@ public class MutablePropertyValues implements PropertyValues, Serializable {
}
@Override
public Iterator<PropertyValue> iterator() {
return Collections.unmodifiableList(this.propertyValueList).iterator();
}
@Override
public Spliterator<PropertyValue> spliterator() {
return Spliterators.spliterator(this.propertyValueList, 0);
}
@Override
public Stream<PropertyValue> stream() {
return this.propertyValueList.stream();
}
@Override
public PropertyValue[] getPropertyValues() {
return this.propertyValueList.toArray(new PropertyValue[0]);

35
spring-beans/src/main/java/org/springframework/beans/PropertyValues.java
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@@ -16,6 +16,13 @@
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;
/**
@@ -27,7 +34,33 @@ import org.springframework.lang.Nullable;
* @since 13 May 2001
* @see PropertyValue
*/
public interface PropertyValues {
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.

2
spring-beans/src/test/java/org/springframework/beans/AbstractPropertyValuesTests.java
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@@ -30,7 +30,7 @@ public abstract class AbstractPropertyValuesTests {
/**
* Must contain: forname=Tony surname=Blair age=50
*/
protected void doTestTony(PropertyValues pvs) throws Exception {
protected void doTestTony(PropertyValues pvs) {
assertTrue("Contains 3", pvs.getPropertyValues().length == 3);
assertTrue("Contains forname", pvs.contains("forname"));
assertTrue("Contains surname", pvs.contains("surname"));

60
spring-beans/src/test/java/org/springframework/beans/MutablePropertyValuesTests.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2012 the original author or authors.
* 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.
@@ -16,8 +16,11 @@
package org.springframework.beans;
import java.util.Iterator;
import org.junit.Test;
import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;
/**
@@ -25,11 +28,12 @@ import static org.junit.Assert.*;
*
* @author Rod Johnson
* @author Chris Beams
* @author Juergen Hoeller
*/
public class MutablePropertyValuesTests extends AbstractPropertyValuesTests {
@Test
public void testValid() throws Exception {
public void testValid() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.addPropertyValue(new PropertyValue("forname", "Tony"));
pvs.addPropertyValue(new PropertyValue("surname", "Blair"));
@@ -44,7 +48,7 @@ public class MutablePropertyValuesTests extends AbstractPropertyValuesTests {
}
@Test
public void testAddOrOverride() throws Exception {
public void testAddOrOverride() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.addPropertyValue(new PropertyValue("forname", "Tony"));
pvs.addPropertyValue(new PropertyValue("surname", "Blair"));
@@ -59,7 +63,7 @@ public class MutablePropertyValuesTests extends AbstractPropertyValuesTests {
}
@Test
public void testChangesOnEquals() throws Exception {
public void testChangesOnEquals() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.addPropertyValue(new PropertyValue("forname", "Tony"));
pvs.addPropertyValue(new PropertyValue("surname", "Blair"));
@@ -70,7 +74,7 @@ public class MutablePropertyValuesTests extends AbstractPropertyValuesTests {
}
@Test
public void testChangeOfOneField() throws Exception {
public void testChangeOfOneField() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.addPropertyValue(new PropertyValue("forname", "Tony"));
pvs.addPropertyValue(new PropertyValue("surname", "Blair"));
@@ -103,4 +107,50 @@ public class MutablePropertyValuesTests extends AbstractPropertyValuesTests {
assertTrue("new value is bar", fn.getValue().equals("bar"));
}
@Test
public void iteratorContainsPropertyValue() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.add("foo", "bar");
Iterator<PropertyValue> it = pvs.iterator();
assertTrue(it.hasNext());
PropertyValue pv = it.next();
assertEquals("foo", pv.getName());
assertEquals("bar", pv.getValue());
try {
it.remove();
fail("Should have thrown UnsupportedOperationException");
}
catch (UnsupportedOperationException ex) {
// expected
}
assertFalse(it.hasNext());
}
@Test
public void iteratorIsEmptyForEmptyValues() {
MutablePropertyValues pvs = new MutablePropertyValues();
Iterator<PropertyValue> it = pvs.iterator();
assertFalse(it.hasNext());
}
@Test
public void streamContainsPropertyValue() {
MutablePropertyValues pvs = new MutablePropertyValues();
pvs.add("foo", "bar");
assertThat(pvs.stream(), notNullValue());
assertThat(pvs.stream().count(), is(1L));
assertThat(pvs.stream().anyMatch(pv -> "foo".equals(pv.getName()) && "bar".equals(pv.getValue())), is(true));
assertThat(pvs.stream().anyMatch(pv -> "bar".equals(pv.getName()) && "foo".equals(pv.getValue())), is(false));
}
@Test
public void streamIsEmptyForEmptyValues() {
MutablePropertyValues pvs = new MutablePropertyValues();
assertThat(pvs.stream(), notNullValue());
assertThat(pvs.stream().count(), is(0L));
}
}