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/*
* Copyright 2008 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.cfg;
import com.google.gwt.core.ext.PropertyOracle;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.util.CollapsedPropertyKey;
import com.google.gwt.thirdparty.guava.common.base.Objects;
import com.google.gwt.thirdparty.guava.common.collect.Lists;
import com.google.gwt.thirdparty.guava.common.collect.Maps;
import com.google.gwt.thirdparty.guava.common.collect.Sets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
/**
* Generates all possible permutations of properties in a module. Each
* permutation consists of the list of active property values associated with
* that permutation. That list of property values is represented as an array of
* Strings corresponding to the list of properties returned by
* {@link Properties#getBindingProperties()}.
*/
public class PropertyCombinations implements Iterable {
/**
* A bundle of the ordered names of binding and configuration properties and a single set value
* for each that together uniquely identify a particular permutation.
*/
public static class PermutationDescription {
private List bindingPropertyNames = Lists.newArrayList();
private List configurationPropertyNames = Lists.newArrayList();
private List propertyValues = Lists.newArrayList();
@Override
public int hashCode() {
return Objects.hashCode(bindingPropertyNames, configurationPropertyNames, propertyValues);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof PermutationDescription) {
PermutationDescription that = (PermutationDescription) obj;
return Objects.equal(this.bindingPropertyNames, that.bindingPropertyNames)
&& Objects.equal(this.configurationPropertyNames, that.configurationPropertyNames)
&& Objects.equal(this.propertyValues, that.propertyValues);
}
return false;
}
@Override
public String toString() {
return String.format(
"PermutationDescription [bindingPropertyNames=%s, configurationPropertyNames=%s, "
+ "propertyValues=%s]", bindingPropertyNames, configurationPropertyNames, propertyValues);
}
}
/**
* Returns the list of all permutations. This method must return results in a
* consistently sorted order over multiple invocations.
*/
private static List allPermutationsOf(Properties properties,
Set activeLinkerNames) {
BindingProperty[] bindingProperties = getOrderedPropertiesOf(properties);
List permutations = new ArrayList();
if (bindingProperties.length > 0) {
permute(bindingProperties, activeLinkerNames, null, 0, permutations);
} else {
permutations.add(new String[0]);
}
return permutations;
}
private static BindingProperty[] getOrderedPropertiesOf(Properties properties) {
/*
* We delete items from this set, but want to retain the original order as
* much as possible.
*/
Set bindingProperties = Sets.newLinkedHashSet(
properties.getBindingProperties());
// Accumulates the order in which the properties should be evaluated
Map evaluationOrder = Maps.newLinkedHashMap();
/*
* Insert a property after all of the properties that it depends upon have
* been inserted.
*/
while (!bindingProperties.isEmpty()) {
boolean changed = false;
for (Iterator it = bindingProperties.iterator(); it.hasNext();) {
BindingProperty prop = it.next();
Set deps = prop.getRequiredProperties();
if (evaluationOrder.keySet().containsAll(deps)) {
it.remove();
evaluationOrder.put(prop.getName(), prop);
changed = true;
}
}
if (!changed) {
throw new IllegalStateException(
"Cycle detected within remaining property dependencies "
+ bindingProperties.toString());
}
}
return evaluationOrder.values().toArray(
new BindingProperty[evaluationOrder.size()]);
}
private static void permute(BindingProperty[] properties,
Set activeLinkerNames, String[] soFar, int whichProp,
List permutations) {
int lastProp = properties.length - 1;
BindingProperty prop = properties[whichProp];
// Find the last-one-wins Condition
Condition winner = null;
if (prop.getConditionalValues().size() == 1) {
winner = prop.getRootCondition();
} else {
BindingProperty[] answerable = new BindingProperty[soFar.length];
System.arraycopy(properties, 0, answerable, 0, soFar.length);
PropertyOracle propertyOracle = new BindingProperties(answerable, soFar,
ConfigurationProperties.EMPTY).toPropertyOracle();
for (Condition cond : prop.getConditionalValues().keySet()) {
try {
if (cond.isTrue(TreeLogger.NULL, new DeferredBindingQuery(
propertyOracle, activeLinkerNames))) {
winner = cond;
}
} catch (UnableToCompleteException e) {
throw new IllegalStateException("Should never get here for simple properties", e);
}
}
}
assert winner != null;
String[] options = prop.getGeneratedValues(winner);
for (int i = 0; i < options.length; i++) {
String knownValue = options[i];
String[] nextStep = new String[whichProp + 1];
if (whichProp > 0) {
System.arraycopy(soFar, 0, nextStep, 0, soFar.length);
}
nextStep[whichProp] = knownValue;
if (whichProp < lastProp) {
permute(properties, activeLinkerNames, nextStep, whichProp + 1,
permutations);
} else {
// Finished this permutation.
permutations.add(nextStep);
}
}
}
private final Properties properties;
private final List values;
public PropertyCombinations(Properties properties,
Set activeLinkerNames) {
this.properties = properties;
this.values = allPermutationsOf(properties, activeLinkerNames);
}
/**
* Copy constructor that allows the list of property values to be reset.
*/
public PropertyCombinations(PropertyCombinations allPermutations,
List values) {
this.properties = allPermutations.properties;
this.values = values;
}
/**
* Return a list of PropertyPermutations that represent the hard permutations
* that result from collapsing the soft properties in the
* PropertyPermutation's Properties object.
*/
public List collapseProperties() {
// Collate property values in this map
SortedMap> map = Maps.newTreeMap();
BindingProperty[] propertyKeys = getOrderedProperties();
// Loop over all possible property value permutations
for (Iterator it = iterator(); it.hasNext();) {
String[] propertyValues = it.next();
assert propertyValues.length == propertyKeys.length;
BindingProperties bindingProperties =
new BindingProperties(propertyKeys, propertyValues, ConfigurationProperties.EMPTY);
CollapsedPropertyKey key = new CollapsedPropertyKey(bindingProperties);
List list = map.get(key);
if (list == null) {
list = Lists.newArrayList();
map.put(key, list);
}
list.add(propertyValues);
}
// Return the collated values
List toReturn = new ArrayList(
map.size());
for (List list : map.values()) {
toReturn.add(new PropertyCombinations(this, list));
}
return toReturn;
}
/**
* Returns the properties used to generate permutations.
* (Parallel to {@link #getOrderedPropertyValues}.)
*/
public BindingProperty[] getOrderedProperties() {
return getOrderedPropertiesOf(properties);
}
/**
* Returns the value of each property used to generate the given permutation.
* (Parallel to {@link #getOrderedProperties()}.)
*/
public String[] getOrderedPropertyValues(int permutation) {
return values.get(permutation);
}
/**
* Returns a unique description for the given permutation.
*/
public PermutationDescription getPermutationDescription(int permutationId) {
PermutationDescription permutationDescription = new PermutationDescription();
for (BindingProperty bindingProperty : properties.getBindingProperties()) {
permutationDescription.bindingPropertyNames.add(bindingProperty.getName());
}
for (ConfigurationProperty configurationProperty : properties.getConfigurationProperties()) {
permutationDescription.configurationPropertyNames.add(configurationProperty.getName());
}
permutationDescription.propertyValues.addAll(Arrays.asList(this.values.get(permutationId)));
return permutationDescription;
}
/**
* Enumerates each permutation as an array of strings such that the index of
* each string in the array corresponds to the property at the same index in
* the array returned from {@link #getOrderedProperties()}.
*/
@Override
public Iterator iterator() {
return values.iterator();
}
public int size() {
return values.size();
}
}
