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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.devtools.build.lib.packages;
import com.google.devtools.build.lib.events.Location;
import java.util.BitSet;
/**
* Provides attribute setting and retrieval for a Rule. Encapsulating attribute access
* here means it can be passed around independently of the Rule itself. In particular,
* it can be consumed by independent {@link AttributeMap} instances that can apply
* varying kinds of logic for determining the "value" of an attribute. For example,
* a configurable attribute's "value" may be a { config --> value } dictionary
* or a configuration-bound lookup on that dictionary, depending on the context in
* which it's requested.
*
* <p>This class provides the lowest-level access to attribute information. It is *not*
* intended to be a robust public interface, but rather just an input to {@link AttributeMap}
* instances. Use those instances for all domain-level attribute access.
*/
public class AttributeContainer {
private final RuleClass ruleClass;
// Attribute values, keyed by attribute index:
private final Object[] attributeValues;
// Whether an attribute value has been set explicitly in the BUILD file, keyed by attribute index.
private final BitSet attributeValueExplicitlySpecified;
// Attribute locations, keyed by attribute index:
private final Location[] attributeLocations;
/**
* Create a container for a rule of the given rule class.
*/
AttributeContainer(RuleClass ruleClass) {
this.ruleClass = ruleClass;
this.attributeValues = new Object[ruleClass.getAttributeCount()];
this.attributeValueExplicitlySpecified = new BitSet(ruleClass.getAttributeCount());
this.attributeLocations = new Location[ruleClass.getAttributeCount()];
}
/**
* Returns an attribute value by instance, or null on no match.
*/
public Object getAttr(Attribute attribute) {
return getAttr(attribute.getName());
}
/**
* Returns an attribute value by name, or null on no match.
*/
public Object getAttr(String attrName) {
Integer idx = ruleClass.getAttributeIndex(attrName);
return idx != null ? attributeValues[idx] : null;
}
/**
* Returns true iff the given attribute exists for this rule and its value
* is explicitly set in the BUILD file (as opposed to its default value).
*/
public boolean isAttributeValueExplicitlySpecified(Attribute attribute) {
return isAttributeValueExplicitlySpecified(attribute.getName());
}
public boolean isAttributeValueExplicitlySpecified(String attributeName) {
Integer idx = ruleClass.getAttributeIndex(attributeName);
return idx != null && attributeValueExplicitlySpecified.get(idx);
}
/**
* Returns the location of the attribute definition for this rule, or null if not found.
*/
public Location getAttributeLocation(String attrName) {
Integer idx = ruleClass.getAttributeIndex(attrName);
return idx != null ? attributeLocations[idx] : null;
}
Object getAttributeValue(int index) {
return attributeValues[index];
}
void setAttributeValue(Attribute attribute, Object value, boolean explicit) {
Integer index = ruleClass.getAttributeIndex(attribute.getName());
attributeValues[index] = value;
attributeValueExplicitlySpecified.set(index, explicit);
}
void setAttributeValueByName(String attrName, Object value) {
Integer index = ruleClass.getAttributeIndex(attrName);
attributeValues[index] = value;
attributeValueExplicitlySpecified.set(index);
}
void setAttributeLocation(int attrIndex, Location location) {
attributeLocations[attrIndex] = location;
}
void setAttributeLocation(Attribute attribute, Location location) {
Integer index = ruleClass.getAttributeIndex(attribute.getName());
attributeLocations[index] = location;
}
}
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