/*
* Copyright 2014 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.ivyresolve;
import org.gradle.api.InvalidUserCodeException;
import org.gradle.api.artifacts.ComponentMetadata;
import org.gradle.api.artifacts.ComponentSelection;
import org.gradle.api.artifacts.ivy.IvyModuleDescriptor;
import org.gradle.api.internal.artifacts.ComponentSelectionInternal;
import org.gradle.api.specs.Spec;
import org.gradle.api.specs.Specs;
import org.gradle.internal.component.external.model.ModuleComponentResolveMetaData;
import org.gradle.internal.rules.SpecRuleAction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
public class ComponentSelectionRulesProcessor {
private static final Logger LOGGER = LoggerFactory.getLogger(ComponentSelectionRulesProcessor.class);
private static final String USER_CODE_ERROR = "Could not apply component selection rule.";
private final Spec<SpecRuleAction<? super ComponentSelection>> withNoInputs = new Spec<SpecRuleAction<? super ComponentSelection>>() {
public boolean isSatisfiedBy(SpecRuleAction<? super ComponentSelection> element) {
return element.getAction().getInputTypes().isEmpty();
}
};
private final Spec<SpecRuleAction<? super ComponentSelection>> withInputs = Specs.not(withNoInputs);
public void apply(ComponentSelectionInternal selection, Collection<SpecRuleAction<? super ComponentSelection>> specRuleActions, MetadataProvider metadataProvider) {
if (processRules(specRuleActions, withNoInputs, selection, metadataProvider)) {
processRules(specRuleActions, withInputs, selection, metadataProvider);
}
}
private boolean processRules(Collection<SpecRuleAction<? super ComponentSelection>> specRuleActions, Spec<SpecRuleAction<? super ComponentSelection>> filter, ComponentSelectionInternal selection, MetadataProvider metadataProvider) {
for (SpecRuleAction<? super ComponentSelection> rule : specRuleActions) {
if (filter.isSatisfiedBy(rule)) {
processRule(rule, selection, metadataProvider);
if (selection.isRejected()) {
LOGGER.info(String.format("Selection of '%s' rejected by component selection rule: %s", selection.getCandidate(), selection.getRejectionReason()));
return false;
}
}
}
return true;
}
private void processRule(SpecRuleAction<? super ComponentSelection> rule, ComponentSelection selection, MetadataProvider metadataProvider) {
if (!rule.getSpec().isSatisfiedBy(selection)) {
return;
}
List<Object> inputValues = getInputValues(rule.getAction().getInputTypes(), metadataProvider);
if (inputValues.contains(null)) {
// If any of the input values are not available for this selection, ignore the rule
return;
}
try {
rule.getAction().execute(selection, inputValues);
} catch (Exception e) {
throw new InvalidUserCodeException(USER_CODE_ERROR, e);
}
}
private List<Object> getInputValues(List<Class<?>> inputTypes, MetadataProvider metadataProvider) {
if (inputTypes.size() == 0) {
return Collections.emptyList();
}
List<Object> inputs = new ArrayList<Object>(inputTypes.size());
for (Class<?> inputType : inputTypes) {
if (inputType == ModuleComponentResolveMetaData.class) {
inputs.add(metadataProvider.getMetaData());
continue;
}
if (inputType == ComponentMetadata.class) {
inputs.add(metadataProvider.getComponentMetadata());
continue;
}
if (inputType == IvyModuleDescriptor.class) {
inputs.add(metadataProvider.getIvyModuleDescriptor());
continue;
}
// We've already validated the inputs: should never get here.
throw new IllegalStateException();
}
return inputs;
}
}