/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.rubypeople.rdt.internal.core.search;
import org.eclipse.core.runtime.IPath;
import org.rubypeople.rdt.core.ILoadpathEntry;
import org.rubypeople.rdt.core.IRubyElement;
import org.rubypeople.rdt.core.IRubyModel;
import org.rubypeople.rdt.core.IRubyProject;
import org.rubypeople.rdt.core.RubyModelException;
import org.rubypeople.rdt.core.search.IRubySearchScope;
import org.rubypeople.rdt.core.search.SearchPattern;
import org.rubypeople.rdt.internal.compiler.util.SimpleSet;
import org.rubypeople.rdt.internal.core.ExternalSourceFolderRoot;
import org.rubypeople.rdt.internal.core.RubyModelManager;
import org.rubypeople.rdt.internal.core.RubyProject;
import org.rubypeople.rdt.internal.core.search.indexing.IndexManager;
import org.rubypeople.rdt.internal.core.search.matching.MatchLocator;
import org.rubypeople.rdt.internal.core.search.matching.MethodPattern;
/**
* Selects the indexes that correspond to projects in a given search scope
* and that are dependent on a given focus element.
*/
public class IndexSelector {
IRubySearchScope searchScope;
SearchPattern pattern;
IPath[] indexLocations; // cache of the keys for looking index up
public IndexSelector(
IRubySearchScope searchScope,
SearchPattern pattern) {
this.searchScope = searchScope;
this.pattern = pattern;
}
/**
* Returns whether elements of the given project or jar can see the given focus (an IRubyProject or
* a JarSourceFolderRot) either because the focus is part of the project or the jar, or because it is
* accessible throught the project's classpath
*/
public static boolean canSeeFocus(IRubyElement focus, boolean isPolymorphicSearch, IPath projectOrJarPath) {
try {
ILoadpathEntry[] focusEntries = null;
if (isPolymorphicSearch) {
RubyProject focusProject = (RubyProject) focus;
focusEntries = focusProject.getExpandedLoadpath(true);
}
IRubyModel model = focus.getRubyModel();
IRubyProject project = getRubyProject(projectOrJarPath, model);
if (project != null)
return canSeeFocus(focus, (RubyProject) project, focusEntries);
// projectOrJarPath is a jar
// it can see the focus only if it is on the classpath of a project that can see the focus
IRubyProject[] allProjects = model.getRubyProjects();
for (int i = 0, length = allProjects.length; i < length; i++) {
RubyProject otherProject = (RubyProject) allProjects[i];
ILoadpathEntry[] entries = otherProject.getResolvedLoadpath(true);
for (int j = 0, length2 = entries.length; j < length2; j++) {
ILoadpathEntry entry = entries[j];
if (entry.getEntryKind() == ILoadpathEntry.CPE_LIBRARY && entry.getPath().equals(projectOrJarPath))
if (canSeeFocus(focus, otherProject, focusEntries))
return true;
}
}
return false;
} catch (RubyModelException e) {
return false;
}
}
public static boolean canSeeFocus(IRubyElement focus, RubyProject javaProject, ILoadpathEntry[] focusEntriesForPolymorphicSearch) {
try {
if (focus.equals(javaProject))
return true;
if (focusEntriesForPolymorphicSearch != null) {
// look for refering project
IPath projectPath = javaProject.getProject().getFullPath();
for (int i = 0, length = focusEntriesForPolymorphicSearch.length; i < length; i++) {
ILoadpathEntry entry = focusEntriesForPolymorphicSearch[i];
if (entry.getEntryKind() == ILoadpathEntry.CPE_PROJECT && entry.getPath().equals(projectPath))
return true;
}
}
if (focus instanceof ExternalSourceFolderRoot) {
// focus is part of a jar
IPath focusPath = focus.getPath();
ILoadpathEntry[] entries = javaProject.getExpandedLoadpath(true);
for (int i = 0, length = entries.length; i < length; i++) {
ILoadpathEntry entry = entries[i];
if (entry.getEntryKind() == ILoadpathEntry.CPE_LIBRARY && entry.getPath().equals(focusPath))
return true;
}
return false;
}
// look for dependent projects
IPath focusPath = ((RubyProject) focus).getProject().getFullPath();
ILoadpathEntry[] entries = javaProject.getExpandedLoadpath(true);
for (int i = 0, length = entries.length; i < length; i++) {
ILoadpathEntry entry = entries[i];
if (entry.getEntryKind() == ILoadpathEntry.CPE_PROJECT && entry.getPath().equals(focusPath))
return true;
}
return false;
} catch (RubyModelException e) {
return false;
}
}
/*
* Compute the list of paths which are keying index files.
*/
private void initializeIndexLocations() {
IPath[] projectsAndJars = this.searchScope.enclosingProjectsAndJars();
IndexManager manager = RubyModelManager.getRubyModelManager().getIndexManager();
SimpleSet locations = new SimpleSet();
IRubyElement focus = MatchLocator.projectOrJarFocus(this.pattern);
if (focus == null) {
for (int i = 0; i < projectsAndJars.length; i++)
locations.add(manager.computeIndexLocation(projectsAndJars[i]));
} else {
try {
// find the projects from projectsAndJars that see the focus then walk those projects looking for the jars from projectsAndJars
int length = projectsAndJars.length;
RubyProject[] projectsCanSeeFocus = new RubyProject[length];
SimpleSet visitedProjects = new SimpleSet(length);
int projectIndex = 0;
SimpleSet jarsToCheck = new SimpleSet(length);
ILoadpathEntry[] focusEntries = null;
if (this.pattern instanceof MethodPattern) { // should consider polymorphic search for method patterns
RubyProject focusProject = (RubyProject) focus;
focusEntries = focusProject.getExpandedLoadpath(true);
}
IRubyModel model = RubyModelManager.getRubyModelManager().getRubyModel();
for (int i = 0; i < length; i++) {
IPath path = projectsAndJars[i];
RubyProject project = (RubyProject) getRubyProject(path, model);
if (project != null) {
visitedProjects.add(project);
if (canSeeFocus(focus, project, focusEntries)) {
locations.add(manager.computeIndexLocation(path));
projectsCanSeeFocus[projectIndex++] = project;
}
} else {
jarsToCheck.add(path);
}
}
for (int i = 0; i < projectIndex && jarsToCheck.elementSize > 0; i++) {
ILoadpathEntry[] entries = projectsCanSeeFocus[i].getResolvedLoadpath(true);
for (int j = entries.length; --j >= 0;) {
ILoadpathEntry entry = entries[j];
if (entry.getEntryKind() == ILoadpathEntry.CPE_LIBRARY) {
IPath path = entry.getPath();
if (jarsToCheck.includes(path)) {
locations.add(manager.computeIndexLocation(entry.getPath()));
jarsToCheck.remove(path);
}
}
}
}
// jar files can be included in the search scope without including one of the projects that references them, so scan all projects that have not been visited
if (jarsToCheck.elementSize > 0) {
IRubyProject[] allProjects = model.getRubyProjects();
for (int i = 0, l = allProjects.length; i < l && jarsToCheck.elementSize > 0; i++) {
RubyProject project = (RubyProject) allProjects[i];
if (!visitedProjects.includes(project)) {
ILoadpathEntry[] entries = project.getResolvedLoadpath(true);
for (int j = entries.length; --j >= 0;) {
ILoadpathEntry entry = entries[j];
if (entry.getEntryKind() == ILoadpathEntry.CPE_LIBRARY) {
IPath path = entry.getPath();
if (jarsToCheck.includes(path)) {
locations.add(manager.computeIndexLocation(entry.getPath()));
jarsToCheck.remove(path);
}
}
}
}
}
}
} catch (RubyModelException e) {
// ignored
}
}
this.indexLocations = new IPath[locations.elementSize];
Object[] values = locations.values;
int count = 0;
for (int i = values.length; --i >= 0;)
if (values[i] != null)
this.indexLocations[count++] = (IPath) values[i];
}
public IPath[] getIndexLocations() {
if (this.indexLocations == null) {
this.initializeIndexLocations();
}
return this.indexLocations;
}
/**
* Returns the ruby project that corresponds to the given path.
* Returns null if the path doesn't correspond to a project.
*/
private static IRubyProject getRubyProject(IPath path, IRubyModel model) {
IRubyProject project = model.getRubyProject(path.lastSegment());
if (project.exists()) {
return project;
}
return null;
}
}