/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.util;
import com.google.gwt.dev.Permutation;
import com.google.gwt.dev.cfg.BindingProperty;
import com.google.gwt.dev.cfg.StaticPropertyOracle;
import java.util.Arrays;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
/**
* Creates a string representation of the binding property key/value pairs used
* in a Permutation. The value of a collapsed property will be represented by
* the set of equivalent values.
* <p>
* Assume that the <code>safari</code> and <code>ie8</code>
* <code>user.agent</code> values have been collapsed. Instead of printing
* <code>user.agent=safari</code>, this class will use
* <code>user.agent = { ie8, safari }</code>.
*/
public class CollapsedPropertyKey extends StringKey {
/**
* Create the string key for a collection of property oracles.
*/
private static String collapse(StaticPropertyOracle... oracles) {
// The map used to create the string key
SortedMap<String, SortedSet<String>> collapsedPropertyMap = new TreeMap<String, SortedSet<String>>();
for (StaticPropertyOracle oracle : oracles) {
for (int i = 0, j = oracle.getOrderedProps().length; i < j; i++) {
BindingProperty prop = oracle.getOrderedProps()[i];
String value = oracle.getOrderedPropValues()[i];
boolean isCollapsed = false;
// Iterate over the equivalence sets defined in the property
for (Set<String> equivalenceSet : prop.getCollapsedValues()) {
if (equivalenceSet.contains(value)) {
/*
* If we find a set that contains the current value, add all the
* values in the set. This accounts for the transitive nature of
* equality.
*/
SortedSet<String> toAdd = collapsedPropertyMap.get(prop.getName());
if (toAdd == null) {
toAdd = new TreeSet<String>();
collapsedPropertyMap.put(prop.getName(), toAdd);
isCollapsed = true;
}
toAdd.addAll(equivalenceSet);
}
}
if (!isCollapsed) {
// For "hard" properties, add the singleton value
collapsedPropertyMap.put(prop.getName(), new TreeSet<String>(
Arrays.asList(value)));
}
}
}
return collapsedPropertyMap.toString();
}
private final Permutation permutation;
/**
* Constructor that constructs a key containing all collapsed property/value
* pairs used by a Permutation. The given Permutation can be retrieved later
* through {@link #getPermutation()}.
*/
public CollapsedPropertyKey(Permutation permutation) {
super(collapse(permutation.getPropertyOracles()));
this.permutation = permutation;
}
/**
* Constructor that constructs a key based on all collapsed property/value
* pairs defined by the given property oracle.
*/
public CollapsedPropertyKey(StaticPropertyOracle oracle) {
super(collapse(oracle));
this.permutation = null;
}
public Permutation getPermutation() {
return permutation;
}
}