org.xacml4j.v30.spi.pip.DefaultResolverContext.java Source code

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Here is the source code for org.xacml4j.v30.spi.pip.DefaultResolverContext.java

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package org.xacml4j.v30.spi.pip;

/*
 * #%L
 * Xacml4J Core Engine Implementation
 * %%
 * Copyright (C) 2009 - 2014 Xacml4J.org
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */

import java.util.Calendar;
import java.util.List;

import org.xacml4j.v30.AttributeReferenceKey;
import org.xacml4j.v30.BagOfAttributeExp;
import org.xacml4j.v30.EvaluationContext;
import org.xacml4j.v30.EvaluationException;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.common.base.Ticker;
import com.google.common.collect.ImmutableList;

final class DefaultResolverContext implements ResolverContext {
    private EvaluationContext context;
    private List<BagOfAttributeExp> keys;
    private ResolverDescriptor descriptor;

    public DefaultResolverContext(EvaluationContext context, ResolverDescriptor descriptor)
            throws EvaluationException {
        Preconditions.checkNotNull(context);
        Preconditions.checkNotNull(descriptor);
        this.context = context;
        this.descriptor = descriptor;
        this.keys = evaluateKeys(context, descriptor.getKeyRefs());
    }

    @Override
    public Calendar getCurrentDateTime() {
        return context.getCurrentDateTime();
    }

    @Override
    public Ticker getTicker() {
        return context.getTicker();
    }

    @Override
    public ResolverDescriptor getDescriptor() {
        return descriptor;
    }

    @Override
    public List<BagOfAttributeExp> getKeys() {
        return keys;
    }

    private static List<BagOfAttributeExp> evaluateKeys(EvaluationContext context,
            List<AttributeReferenceKey> keyRefs) throws EvaluationException {
        if (keyRefs == null) {
            return ImmutableList.of();
        }
        ImmutableList.Builder<BagOfAttributeExp> b = ImmutableList.builder();
        for (AttributeReferenceKey ref : keyRefs) {
            b.add(ref.resolve(context));
        }
        return b.build();
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("context", context).add("descriptor", descriptor).add("keys", keys)
                .toString();
    }

}