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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.model.graph;
import com.yahoo.config.model.ConfigModel;
import com.yahoo.config.model.builder.xml.ConfigModelBuilder;
import java.util.ArrayList;
import java.util.List;
/**
* Used to add builders and elements in addBuilder, and then build a dependency graph based on the
* constructor arguments.
*
* @author lulf
* @since 5.1
*/
public class ModelGraphBuilder {
private final List<ConfigModelBuilder<? extends ConfigModel>> builders = new ArrayList<>();
/**
* Add a {@link com.yahoo.config.model.builder.xml.ConfigModelBuilder} to this graph.
*
* @param builder The {@link com.yahoo.config.model.builder.xml.ConfigModelBuilder} to add.
* @return this for convenience
*/
public ModelGraphBuilder addBuilder(ConfigModelBuilder<? extends ConfigModel> builder) {
builders.add(builder);
return this;
}
/**
* Build a {@link com.yahoo.config.model.graph.ModelGraph} based on the {@link com.yahoo.config.model.builder.xml.ConfigModelBuilder}s
* added to this.
*
* @return A {@link com.yahoo.config.model.graph.ModelGraph} representing the dependency graph.
*/
public ModelGraph build() {
List<ModelNode> modelNodes = new ArrayList<>();
for (ConfigModelBuilder<? extends ConfigModel> builder : builders) {
modelNodes.add(new ModelNode(builder));
}
List<ModelNode> roots = new ArrayList<>();
for (ModelNode modelNode : modelNodes) {
int numDependencies = modelNode.addDependenciesFrom(modelNodes);
if (numDependencies == 0) {
roots.add(modelNode);
}
}
return new ModelGraph(modelNodes, roots);
}
}
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