org.gradle.api.internalivyservice.resolveengine.graph.builder.VariantNameBuilder Maven / Gradle / Ivy
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/*
* Copyright 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
*
* 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.artifacts.ivyservice.resolveengine.graph.builder;
import com.google.common.collect.Maps;
import org.apache.commons.lang.StringUtils;
import org.gradle.internal.Describables;
import org.gradle.internal.DisplayName;
import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;
/**
* A memory-efficient builder for variant names.
*
* When a component has multiple selected nodes (or multiple selected configurations), we build a name for the variant
* from the names of the configurations. The set of names for these configurations is relatively limited, so we cache
* the generated names to avoid recreating multiple times.
*/
public class VariantNameBuilder {
private final Map, DisplayName> names = Maps.newHashMap();
@Nullable
public DisplayName getVariantName(@Nullable List parts) {
if (parts == null) {
return null;
}
DisplayName displayName = names.get(parts);
if (displayName == null) {
displayName = variantName(parts);
names.put(parts, displayName);
}
return displayName;
}
private static DisplayName variantName(List parts) {
if (parts.size() == 1) {
return Describables.of(parts.get(0));
}
return new MultipleVariantName(parts);
}
private static class MultipleVariantName implements DisplayName {
private final List parts;
private MultipleVariantName(List parts) {
this.parts = parts;
}
@Override
public String getCapitalizedDisplayName() {
return StringUtils.capitalize(getDisplayName());
}
@Override
public String getDisplayName() {
StringBuilder sb = new StringBuilder(16 * parts.size());
boolean appendPlus = false;
for (String part : parts) {
if (appendPlus) {
sb.append("+");
}
sb.append(part);
appendPlus = true;
}
return sb.toString();
}
}
}