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package org.jvnet.hk2.component;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.jvnet.hk2.component.matcher.SimpleLdapMatcher;
/**
* Builder for constructing InhabitantTrackerContext types.
*
* @author Jeff Trent
*
* @since 3.1
*/
public class InhabitantTrackerContextBuilder {
private InhabitantFilter filter;
private Boolean presence;
private Set<String> classNames;
protected InhabitantTrackerContextBuilder() {
}
/**
* Creates a builder appropriate for the given habitat
*
* @param h the habitat
*
* @return the factory
*/
public static InhabitantTrackerContextBuilder create(Habitat h) {
// the habitat is not needed to distinguish the implementation at present
return new InhabitantTrackerContextBuilder();
}
@Override
public String toString() {
return getClass().getSimpleName() + "-" + System.identityHashCode(this) +
"(" + build() + ")";
}
public InhabitantTrackerContextBuilder presence(Boolean presence) {
this.presence = presence;
return this;
}
public Boolean getPresence() {
return presence;
}
public InhabitantTrackerContextBuilder classNames(String... classNames) {
this.classNames = new HashSet<String>(Arrays.asList(classNames));
return this;
}
public InhabitantTrackerContextBuilder classNames(Set<String> classNames) {
this.classNames = new HashSet<String>(classNames);
return this;
}
public Set<String> getClassNames() {
return Collections.unmodifiableSet(classNames);
}
public InhabitantTrackerContextBuilder filter(InhabitantFilter filter) {
this.filter = filter;
return this;
}
public InhabitantFilter getFilter() {
return filter;
}
public InhabitantTrackerContextBuilder ldapFilter(String ldapExpression)
throws ComponentException {
SimpleLdapMatcher matcher = SimpleLdapMatcher.create(ldapExpression);
Set<String> classNames = matcher.getTheAndSetFor(Constants.OBJECTCLASS, true);
if (classNames.isEmpty()) throw new IllegalArgumentException("invalid expression");
for (String item : classNames) {
if (hasWildcard(item)) {
throw new ComponentException("no wilcards permitted");
}
}
return filter(new AlteredLdapMatcherFilter(matcher)).classNames(classNames);
}
protected boolean hasWildcard(String item) {
return (item.indexOf('*') >= 0);
}
public InhabitantTrackerContext build() {
if (null == classNames || classNames.isEmpty()) throw new IllegalStateException();
return new InhabitantTrackerContextImpl(filter, presence, classNames);
}
protected static class AlteredLdapMatcherFilter implements InhabitantFilter {
private final SimpleLdapMatcher matcher;
protected AlteredLdapMatcherFilter(SimpleLdapMatcher matcher) {
this.matcher = matcher;
}
@Override
public boolean matches(Inhabitant<?> i) {
MultiMap<String, String> map = i.metadata();
if (null == map || map.size() == 0) {
return true;
}
return matcher.matches(map);
}
@Override
public String toString() {
return matcher.toString();
}
}
}