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// Copyright (C) 2011 The Android Open Source Project
//
// 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 gerrit;
import com.google.gerrit.common.data.LabelType;
import com.google.gerrit.rules.StoredValues;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.permissions.LabelPermission;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gwtorm.server.OrmException;
import com.googlecode.prolog_cafe.exceptions.IllegalTypeException;
import com.googlecode.prolog_cafe.exceptions.JavaException;
import com.googlecode.prolog_cafe.exceptions.PInstantiationException;
import com.googlecode.prolog_cafe.exceptions.PrologException;
import com.googlecode.prolog_cafe.exceptions.SystemException;
import com.googlecode.prolog_cafe.lang.IntegerTerm;
import com.googlecode.prolog_cafe.lang.JavaObjectTerm;
import com.googlecode.prolog_cafe.lang.Operation;
import com.googlecode.prolog_cafe.lang.Predicate;
import com.googlecode.prolog_cafe.lang.Prolog;
import com.googlecode.prolog_cafe.lang.SymbolTerm;
import com.googlecode.prolog_cafe.lang.Term;
import com.googlecode.prolog_cafe.lang.VariableTerm;
import java.util.Set;
/**
* Resolves the valid range for a label on a CurrentUser.
*
* <pre>
* '_user_label_range'(+Label, +CurrentUser, -Min, -Max)
* </pre>
*/
class PRED__user_label_range_4 extends Predicate.P4 {
PRED__user_label_range_4(Term a1, Term a2, Term a3, Term a4, Operation n) {
arg1 = a1;
arg2 = a2;
arg3 = a3;
arg4 = a4;
cont = n;
}
@Override
public Operation exec(Prolog engine) throws PrologException {
engine.setB0();
Term a1 = arg1.dereference();
Term a2 = arg2.dereference();
Term a3 = arg3.dereference();
Term a4 = arg4.dereference();
if (a1 instanceof VariableTerm) {
throw new PInstantiationException(this, 1);
}
if (!(a1 instanceof SymbolTerm)) {
throw new IllegalTypeException(this, 1, "atom", a1);
}
String label = a1.name();
if (a2 instanceof VariableTerm) {
throw new PInstantiationException(this, 2);
}
if (!(a2 instanceof JavaObjectTerm) || !a2.convertible(CurrentUser.class)) {
throw new IllegalTypeException(this, 2, "CurrentUser)", a2);
}
CurrentUser user = (CurrentUser) ((JavaObjectTerm) a2).object();
Set<LabelPermission.WithValue> can;
try {
ChangeData cd = StoredValues.CHANGE_DATA.get(engine);
LabelType type = cd.getLabelTypes().byLabel(label);
if (type == null) {
return engine.fail();
}
can = StoredValues.PERMISSION_BACKEND.get(engine).user(user).change(cd).test(type);
} catch (OrmException err) {
throw new JavaException(this, 1, err);
} catch (PermissionBackendException err) {
SystemException se = new SystemException(err.getMessage());
se.initCause(err);
throw se;
}
int min = 0;
int max = 0;
for (LabelPermission.WithValue v : can) {
min = Math.min(min, v.value());
max = Math.max(max, v.value());
}
if (!a3.unify(new IntegerTerm(min), engine.trail)) {
return engine.fail();
}
if (!a4.unify(new IntegerTerm(max), engine.trail)) {
return engine.fail();
}
return cont;
}
}
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