org.opensaml.messaging.context.navigate.ParentContextLookup Maven / Gradle / Ivy
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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.messaging.context.navigate;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.opensaml.messaging.context.BaseContext;
import net.shibboleth.utilities.java.support.annotation.ParameterName;
import net.shibboleth.utilities.java.support.logic.Constraint;
/**
* A {@link ContextDataLookupFunction} that gets the parent of a given context.
*
* @param type of starting context
* @param type of the parent context
*/
public class ParentContextLookup
implements ContextDataLookupFunction {
/** Parent type. */
@Nonnull private final Class parentType;
/**
* Constructor.
*
* @param type parent context type to look up
*/
public ParentContextLookup(@Nonnull @ParameterName(name="type") final Class type) {
parentType = Constraint.isNotNull(type, "Parent context type cannot be null");
}
/** {@inheritDoc} */
@Nullable public ParentContext apply(@Nullable final StartContext input) {
if (input != null) {
final BaseContext parent = input.getParent();
if (parentType.isInstance(parent)) {
return parentType.cast(parent);
}
}
return null;
}
}