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package com.paypal.butterfly.utilities.maven;
import com.paypal.butterfly.extensions.api.exception.TransformationUtilityException;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* This is a tree of Maven artifacts, which are represented by {@link Model} objects.
* The idea here is, given a list of Maven pom.xml {@link File} objects, create a tree
* based on dependency among them, but specifying explicitly which Maven artifact should
* be at the root of the tree. That means, if any artifact in the list is not a child,
* directly or indirectly, of the root artifact, then it will end up no being in the tree.
*
* As a result of building this tree, it is possible to know, out of the initial pom.xml files list,
* which ones actually inherit, directly or not, from the root artifact. The result is retrieved
* by calling {@link #getPomFilesInTree()}
*
* @author facarvalho
*/
class ModelTree {
private ModelNode rootNode;
private List nodesInTree = new ArrayList<>();
// TODO we can comment this out in the future if we need this feature
// private List modelsInTree = new ArrayList<>();
// private List modelsNotInTree = new ArrayList<>();
private List pomFilesInTree = new ArrayList<>();
/**
* This is a tree of Maven artifacts, which are represented by {@link Model} objects.
* The idea here is, given a list of Maven pom.xml {@link File} objects, create a tree
* based on dependency among them, but specifying explicitly which Maven artifact should
* be at the root of the tree. That means, if any artifact in the list is not a child,
* directly or indirectly, of the root artifact, then it will end up no being in the tree.
*
* As a result of building this tree, it is possible to know, out of the initial pom.xml files list,
* which ones actually inherit, directly or not, from the root artifact. The result is retrieved
* by calling {@link #getPomFilesInTree()}
*
* @param rootGroupId the group id of the artifact that should be at the root of the tree
* @param rootArtifactId the artifact id of the artifact that should be at the root of the tree
* @param rootVersion the version of the artifact that should be at the root of the tree
* @param pomFiles a list of pom.xml files used to make the tree
*/
public ModelTree(String rootGroupId, String rootArtifactId, String rootVersion, List pomFiles) {
Model rootModel = new Model();
rootModel.setGroupId(rootGroupId);
rootModel.setArtifactId(rootArtifactId);
rootModel.setVersion(rootVersion);
List models = new ArrayList<>();
models.add(rootModel);
for (File pomFile : pomFiles) {
models.add(createModel(pomFile));
}
// TODO we can comment this out in the future if we need this feature
// modelsNotInTree = add(models);
add(models);
}
private Model createModel(File pomFile) {
FileInputStream fileInputStream = null;
Exception ex = null;
Model model = null;
try {
MavenXpp3Reader reader = new MavenXpp3Reader();
fileInputStream = new FileInputStream(pomFile);
model = reader.read(fileInputStream);
if (model.getGroupId() == null) model.setGroupId(model.getParent().getGroupId());
if (model.getVersion() == null) model.setVersion(model.getParent().getVersion());
model.setPomFile(pomFile);
} catch (Exception e) {
ex = e;
String exceptionMessage = String.format("Error when trying to create Maven pom file model, double check if this file has a valid Maven structure: %s", pomFile.getAbsolutePath());
throw new TransformationUtilityException(exceptionMessage, ex);
} finally {
if (fileInputStream != null) try {
fileInputStream.close();
} catch (IOException e) {
if (ex != null) ex.addSuppressed(e);
}
}
return model;
}
private List add(List models) {
int previousTreeSize = -1;
while (models.size() > 0 && size() > previousTreeSize) {
previousTreeSize = size();
List leftOverModels = models;
models = new ArrayList<>();
for (Model model : leftOverModels) {
if (!add(model)) {
models.add(model);
}
}
}
return models;
}
private boolean add(Model model) {
ModelNode temp = null;
if (rootNode == null) {
rootNode = new ModelNode(model);
nodesInTree.add(rootNode);
// TODO
// We can comment this out in the future if we want to allow
// not fixing the root artifact
// } else if (rootNode.isChildOf(model)) {
// temp = rootNode;
// rootNode = new ModelNode(model);
// rootNode.addChild(temp);
// nodesInTree.add(rootNode);
} else {
for (ModelNode n : nodesInTree) {
if(n.isParentOf(model)) {
temp = new ModelNode(model);
n.addChild(temp);
nodesInTree.add(temp);
break;
}
}
if (temp == null) {
return false;
}
}
// TODO
// We can comment this out in the future if we need this feature
// modelsInTree.add(model);
if (model.getPomFile() != null) {
pomFilesInTree.add(model.getPomFile());
}
return true;
}
public int size() {
return nodesInTree.size();
}
/**
* List of pom.xml files that, directly or not, are children of the root artifact
* set in the artifacts tree
*
* @return a list of pom.xml files that, directly or not, are children of the root artifact
* set in the artifacts tree
*/
public List getPomFilesInTree() {
return pomFilesInTree;
}
private static class ModelNode {
private Model model;
private List children;
private ModelNode(Model model) {
this.model = model;
children = new ArrayList();
}
private void addChild(ModelNode child) {
children.add(child);
}
@SuppressWarnings("PMD.SimplifyBooleanReturns")
private boolean isParentOf(Model model) {
if (model.getParent() == null) {
return false;
}
if (!this.model.getGroupId().equals(model.getParent().getGroupId())) return false;
if (!this.model.getArtifactId().equals(model.getParent().getArtifactId())) return false;
if (!this.model.getVersion().equals(model.getParent().getVersion())) return false;
return true;
}
// TODO
// We can comment this out in the future if we want to allow
// @SuppressWarnings("PMD.SimplifyBooleanReturns")
// private boolean isChildOf(Model model) {
// if (this.model.getParent() == null) {
// return false;
// }
//
// if (!model.getGroupId().equals(this.model.getParent().getGroupId())) return false;
// if (!model.getArtifactId().equals(this.model.getParent().getArtifactId())) return false;
// if (!model.getVersion().equals(this.model.getParent().getVersion())) return false;
// return true;
// }
}
}
