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XML Security Implementation

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/*
 * Licensed to the University Corporation for Advanced Internet Development,
 * Inc. (UCAID) under one or more contributor license agreements.  See the
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID licenses this file to You 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 org.opensaml.xmlsec.impl;

import javax.annotation.Nullable;

import net.shibboleth.utilities.java.support.logic.Constraint;

import org.opensaml.xmlsec.algorithm.AlgorithmRegistry;

import com.google.common.base.Predicate;

/**
 * A predicate which evaluates whether a cryptographic algorithm URI is effectively supported by
 * the runtime environment, as determined by {@link AlgorithmRegistry#isRuntimeSupported(String)}.
 */
public class AlgorithmRuntimeSupportedPredicate implements Predicate {
    
    /** The algorithm registry instance. */
    private AlgorithmRegistry registry;
    
    /**
     * Constructor.
     *
     * @param algorithmRegistry the algorithm registry instance to use
     */
    public AlgorithmRuntimeSupportedPredicate(final AlgorithmRegistry algorithmRegistry) {
        registry = Constraint.isNotNull(algorithmRegistry, "AlgorithmRegistry may not be null");
    }

    /** {@inheritDoc} */
    public boolean apply(@Nullable final String input) {
        return registry.isRuntimeSupported(input);
    }

}