com.nedap.archie.diff.DifferentialPathGenerator Maven / Gradle / Ivy
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tools that operate on the archie reference models and archetype object model
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package com.nedap.archie.diff;
import com.nedap.archie.aom.Archetype;
import com.nedap.archie.aom.CAttribute;
import com.nedap.archie.aom.CComplexObject;
import com.nedap.archie.aom.CObject;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;
/**
* Replaces a tree of specialized CObjects and CAttributes with the differential paths where possible
**/
public class DifferentialPathGenerator {
private Archetype diffed;
public void replace(Archetype diffed) {
this.diffed = diffed;
for(CAttribute attribute:diffed.getDefinition().getAttributes()) {
replace( attribute, null);
}
}
private void replace(CAttribute attribute, @Nullable CompressablePath compressablePath) {
if(canAddToCompressablePath(attribute)) {
if(compressablePath == null) {
compressablePath = new CompressablePath(attribute);
CObject cObject = attribute.getChildren().get(0); //can only be one exactly. This prevents ConcurrentModificationExceptions
if(canAddToCompressablePath(cObject)) {
//no need to add the cObject, it's a single one anyway
replaceChildAttribute(cObject, compressablePath);
} else {
replaceChildAttributes(cObject);
}
} else {
compressablePath.addAttribute(attribute);
//this could be refactored into smaller code by combining the case above, but if single attribute paths are to be supported
//it will get messy
CObject cObject = attribute.getChildren().get(0); //can only be one exactly. This prevents ConcurrentModificationExceptions
if(canAddToCompressablePath(cObject)) {
//no need to add the cObject, it's a single one anyway
replaceChildAttribute(cObject, compressablePath);
} else {
//end the compressable path here
compressablePath.replaceWithSingleAttribute();
replaceChildAttributes(cObject);
}
}
} else {
if(compressablePath != null) {
compressablePath.addAttribute(attribute); //even though this cannot be further compressed, the attribute can be added just fine
//this is the end of the compressable path. This attribute must be added as the last bit.
compressablePath.replaceWithSingleAttribute();
}
for(CObject cObject: attribute.getChildren()){
replaceChildAttributes(cObject);
}
}
}
private void replaceChildAttribute(CObject cObject, CompressablePath compressablePath) {
CAttribute childAttribute = cObject.getAttributes().get(0); //can only be one exactly. This prevents ConcurrentModificationExceptions
replace( childAttribute, compressablePath);
}
private void replaceChildAttributes(CObject cObject) {
for (CAttribute childAttribute : cObject.getAttributes()) {
replace( childAttribute, null);
}
}
private boolean canAddToCompressablePath(CAttribute attribute) {
return attribute.getCardinality() == null && attribute.getExistence() == null && attribute.getChildren().size() == 1;
}
private boolean canAddToCompressablePath(CObject cObject) {
if(cObject instanceof CComplexObject) {
return cObject.specialisationDepth() < diffed.specializationDepth() &&
cObject.getAttributes().size() == 1 &&
cObject.getOccurrences() == null &&
cObject.getSiblingOrder() == null &&
((CComplexObject) cObject).getAttributeTuples().isEmpty();
} else {
return false;
}
}
class CompressablePath {
//storing just the start and end would be enough and save minor memory at no cpu cost, but not worth the optimization now
private List attributes = new ArrayList<>();
public CompressablePath(CAttribute rootAtttribute) {
attributes.add(rootAtttribute);
}
public void addAttribute(CAttribute attribute) {
this.attributes.add(attribute);
}
public CAttribute getRootAttribute() {
return attributes.get(0);
}
public CAttribute getLastAttribute() {
return attributes.get(attributes.size()-1);
}
public List getAttributes() {
return attributes;
}
public void replaceWithSingleAttribute() {
CAttribute root = getRootAttribute();
CAttribute last = getLastAttribute();
root.setChildren(last.getChildren());
root.setDifferentialPath(getPath());
root.setRmAttributeName(last.getRmAttributeName());
root.setExistence(last.getExistence());
root.setCardinality(last.getCardinality());
}
public String getPath() {
CAttribute last = getLastAttribute();
CAttribute root = getRootAttribute();
CObject cObject = null;
CAttribute currentAttribute = last;
StringBuilder pathBuilder = new StringBuilder();
while(currentAttribute != root) { //object != is really what we want here, do not replace with equals
addToPath(currentAttribute, cObject, pathBuilder);
cObject = currentAttribute.getParent();
currentAttribute = cObject.getParent();
}
addToPath(root, cObject, pathBuilder);
return pathBuilder.toString();
}
private void addToPath(CAttribute currentAttribute, CObject cObject, StringBuilder pathBuilder) {
if(cObject != null) {
//prepend, so this insertion order is backwards
pathBuilder.insert(0, "]");
pathBuilder.insert(0, cObject.getNodeId());
pathBuilder.insert(0, "[");
}
pathBuilder.insert(0, currentAttribute.getRmAttributeName());
pathBuilder.insert(0, "/");
}
}
}