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/*******************************************************************************
* Copyright (c) 2007 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Robert Fuhrer (rfuhrer@watson.ibm.com) - initial API and implementation
*******************************************************************************/
package org.eclipse.imp.builder;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.resources.IProject;
/**
* Tracks dependencies among compilation units in a given project.<br>
* @author rfuhrer@watson.ibm.com
*/
public class DependencyInfo {
protected final Map<String /*unitPath*/, Set<String /*unitPath*/>> fDependsUpon= new HashMap<String,Set<String>>();
protected final Map<String /*unitPath*/, Set<String /*unitPath*/>> fIsDependedUponBy= new HashMap<String,Set<String>>();
protected final IProject fProject;
protected final String fWorkspacePath;
public DependencyInfo(IProject project) {
fProject= project;
fWorkspacePath= fProject.getProject().getWorkspace().getRoot().getLocation().toString();
}
protected Set<String /*unitPath*/> getEntry(Map<String /*unitPath*/, Set<String /*unitPath*/>> map, String unitPath) {
Set<String> result;
if (!map.containsKey(unitPath))
result= Collections.emptySet();
else
result= map.get(unitPath);
return result;
}
protected Set<String> getOrCreateEntry(Map<String,Set<String>> map, String unitPath) {
Set<String> result;
if (!map.containsKey(unitPath))
map.put(unitPath, result= new HashSet<String>());
else
result= (Set<String>) map.get(unitPath);
return result;
}
/**
* Records a dependency between the two compilation units.
* @param fromPath a compilation unit path; should be workspace-relative
* @param uponPath a compilation unit path; should be workspace-relative
*/
public void addDependency(String fromPath, String uponPath) {
Set<String> fwdEntry= getOrCreateEntry(fDependsUpon, fromPath);
fwdEntry.add(uponPath);
Set<String> bkwdEntry= getOrCreateEntry(fIsDependedUponBy, uponPath);
bkwdEntry.add(fromPath);
}
/**
* Clears the memory of all dependencies among all compilation units tracked by
* this DependencyInfo instance.
*/
public void clearAllDependencies() {
fDependsUpon.clear();
fIsDependedUponBy.clear();
}
/**
* Clears any dependencies related to the given compilation unit
* @param unitPath should be workspace-relative
*/
public void clearDependenciesOf(String unitPath) {
Set<String> entry= getEntry(fDependsUpon, unitPath);
fDependsUpon.put(unitPath, new HashSet<String>());
for(Iterator<String> iter= entry.iterator(); iter.hasNext(); ) {
String uponPath= (String) iter.next();
Set<String> uponSet= getEntry(fIsDependedUponBy, uponPath);
uponSet.remove(unitPath);
}
}
/**
* @return a Map from workspace-relative unit paths to Sets of dependent
* workspace-relative unit paths
*/
public Map<String /*path*/, Set<String /*path*/>> getDependencies() {
return Collections.unmodifiableMap(fDependsUpon);
}
/**
* @param unitPath should be workspace-relative
* @return a Set of dependent workspace--relative unit paths
*/
public Set<String /*path*/> getDependentsOf(String unitPath) {
return (Set) fIsDependedUponBy.get(unitPath);
}
public void dump() {
System.out.print(toString());
// System.out.println("*** Dependencies ***:");
// for(Iterator<String> iter= fDependsUpon.keySet().iterator(); iter.hasNext(); ) {
// String unit= iter.next();
// Set<String /*path*/> dependents= (Set) fDependsUpon.get(unit);
//
// System.out.println("Unit " + unit + ": ");
// for(Iterator<String> iterator= dependents.iterator(); iterator.hasNext(); ) {
// String uponUnit= iterator.next();
// System.out.print(" ");
// System.out.print(uponUnit);
// if (iterator.hasNext()) System.out.print(", ");
// }
// System.out.println();
// }
}
@Override
public String toString() {
StringBuilder sb= new StringBuilder();
sb.append("*** Dependencies ***:\n");
for(Iterator<String> iter= fDependsUpon.keySet().iterator(); iter.hasNext(); ) {
String unit= iter.next();
Set<String /*path*/> dependents= (Set) fDependsUpon.get(unit);
sb.append("Unit " + unit + ": \n");
for(Iterator<String> iterator= dependents.iterator(); iterator.hasNext(); ) {
String uponUnit= iterator.next();
sb.append(" ");
sb.append(uponUnit);
if (iterator.hasNext()) sb.append(", ");
}
sb.append("\n");
}
return sb.toString();
}
}
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