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org.gradle.api.internal.attributes.DefaultImmutableAttributes Maven / Gradle / Ivy
/*
* Copyright 2017 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
*
* http://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.gradle.api.internal.attributes;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import org.gradle.api.Named;
import org.gradle.api.attributes.Attribute;
import org.gradle.api.attributes.AttributeContainer;
import org.gradle.internal.Cast;
import org.gradle.internal.isolation.Isolatable;
import javax.annotation.Nullable;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
final class DefaultImmutableAttributes implements ImmutableAttributes, AttributeValue {
private static final Comparator> ATTRIBUTE_NAME_COMPARATOR = Comparator.comparing(Attribute::getName);
// Coercion is an expensive process, so we cache the result of coercing to other attribute types.
// We can afford using a hashmap here because attributes are interned, and their lifetime doesn't
// exceed a build
private final Map, Object> coercionCache = Maps.newConcurrentMap();
final Attribute attribute;
final Isolatable value;
private final ImmutableMap, DefaultImmutableAttributes> hierarchy;
private final ImmutableMap hierarchyByName;
private final int hashCode;
// Optimize for the single entry case, makes findEntry faster
private final String singleEntryName;
private final DefaultImmutableAttributes singleEntryValue;
DefaultImmutableAttributes() {
this.attribute = null;
this.value = null;
this.hashCode = 0;
this.hierarchy = ImmutableMap.of();
this.hierarchyByName = ImmutableMap.of();
this.singleEntryName = null;
this.singleEntryValue = null;
}
DefaultImmutableAttributes(DefaultImmutableAttributes parent, Attribute key, Isolatable value) {
this.attribute = key;
this.value = value;
Map, DefaultImmutableAttributes> hierarchy = Maps.newLinkedHashMap();
hierarchy.putAll(parent.hierarchy);
hierarchy.put(attribute, this);
this.hierarchy = ImmutableMap.copyOf(hierarchy);
Map hierarchyByName = Maps.newLinkedHashMap();
hierarchyByName.putAll(parent.hierarchyByName);
hierarchyByName.put(attribute.getName(), this);
this.hierarchyByName = ImmutableMap.copyOf(hierarchyByName);
int hashCode = parent.hashCode();
hashCode = 31 * hashCode + attribute.hashCode();
hashCode = 31 * hashCode + value.hashCode();
this.hashCode = hashCode;
if (hierarchyByName.size() == 1) {
Map.Entry entry = hierarchyByName.entrySet().iterator().next();
singleEntryName = entry.getKey();
singleEntryValue = entry.getValue();
} else {
singleEntryName = null;
singleEntryValue = null;
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
DefaultImmutableAttributes that = (DefaultImmutableAttributes) o;
if (hierarchy.size() != that.hierarchy.size()) {
return false;
}
for (Map.Entry, DefaultImmutableAttributes> entry : hierarchy.entrySet()) {
if (!entry.getValue().value.isolate().equals(that.getAttribute(entry.getKey()))) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public ImmutableSet> keySet() {
return hierarchy.keySet();
}
@Override
public AttributeContainer attribute(Attribute key, T value) {
throw new UnsupportedOperationException("Mutation of attributes is not allowed");
}
@Override
public T getAttribute(Attribute key) {
Isolatable isolatable = getIsolatableAttribute(key);
return isolatable == null ? null : isolatable.isolate();
}
@Nullable
protected Isolatable getIsolatableAttribute(Attribute key) {
DefaultImmutableAttributes attributes = hierarchy.get(key);
return Cast.uncheckedCast(attributes == null ? null : attributes.value);
}
/**
* Locates the entry for the given attribute. Returns a 'missing' value when not present.
*/
@Override
public AttributeValue findEntry(Attribute key) {
DefaultImmutableAttributes attributes = hierarchy.get(key);
return Cast.uncheckedNonnullCast(attributes == null ? MISSING : attributes);
}
/**
* Locates the entry for the attribute with the given name. Returns a 'missing' value when not present.
*/
@Override
public AttributeValue findEntry(String key) {
//noinspection StringEquality
if (singleEntryName == key) {
// The identity check is intentional here, do not replace with .equals()
return singleEntryValue;
}
DefaultImmutableAttributes attributes = hierarchyByName.get(key);
return attributes == null ? MISSING : attributes;
}
@Override
public Object get() {
return value.isolate();
}
@Nullable
private String desugar() {
// We support desugaring for all non-primitive types supported in GradleModuleMetadataWriter.writeAttributes(), which are:
// - Named
// - Enum
if (Named.class.isAssignableFrom(attribute.getType())) {
return ((Named) get()).getName();
}
if (Enum.class.isAssignableFrom(attribute.getType())) {
return ((Enum) get()).name();
}
return null;
}
@Nullable
private S coerce(Class type) {
if (value != null) {
return value.coerce(type);
}
return null;
}
@Override
public S coerce(Attribute otherAttribute) {
S s = Cast.uncheckedCast(coercionCache.get(otherAttribute));
if (s == null) {
s = uncachedCoerce(otherAttribute);
coercionCache.put(otherAttribute, s);
}
return s;
}
private S uncachedCoerce(Attribute otherAttribute) {
Class otherAttributeType = otherAttribute.getType();
// If attribute types are already compatible, go with it. There are two cases covered here:
// 1) Both attributes are strongly typed and match, usually the case if both are sourced from the local build
// 2) Both attributes are desugared, usually the case if both are sourced from published metadata
if (otherAttributeType.isAssignableFrom(attribute.getType())) {
return Cast.uncheckedCast(get());
}
// Attempt to coerce myself into the other attribute's type
// - I am desugared and the other attribute is strongly typed, usually the case if I am sourced from published metadata and the other from the local build
S converted = coerce(otherAttributeType);
if (converted != null) {
return converted;
} else if (otherAttributeType.isAssignableFrom(String.class)) {
// Attempt to desugar myself
// - I am strongly typed and the other is desugared, usually the case if I am sourced from the local build and the other is sourced from published metadata
converted = Cast.uncheckedCast(desugar());
if (converted != null) {
return converted;
}
}
String foundType = get().getClass().getName();
if (foundType.equals(otherAttributeType.getName())) {
foundType += " with a different ClassLoader";
}
throw new IllegalArgumentException(String.format("Unexpected type for attribute '%s' provided. Expected a value of type %s but found a value of type %s.", attribute.getName(), otherAttributeType.getName(), foundType));
}
@Override
public boolean isPresent() {
return attribute != null;
}
@Override
public boolean isEmpty() {
return attribute == null;
}
@Override
public boolean contains(Attribute key) {
return hierarchy.containsKey(key);
}
@Override
public ImmutableAttributes asImmutable() {
return this;
}
@Override
public Map, ?> asMap() {
ImmutableMap.Builder, ?> builder = ImmutableMap.builder();
for (Attribute attribute : keySet()) {
builder.put(attribute, Cast.uncheckedCast(getAttribute(attribute)));
}
return builder.build();
}
@Override
public AttributeContainer getAttributes() {
return this;
}
@Override
public String toString() {
Map, Object> sorted = new TreeMap<>(ATTRIBUTE_NAME_COMPARATOR);
for (Map.Entry, DefaultImmutableAttributes> entry : hierarchy.entrySet()) {
sorted.put(entry.getKey(), entry.getValue().value.isolate());
}
return sorted.toString();
}
}