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Copyright 2005-2014 Red Hat, Inc. Red Hat 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 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.

public abstract class ChangeRequirementSupport extends AbstractAction {
    private final FabricService fabricService;
    public ChangeRequirementSupport(FabricService fabricService) {
        this. = fabricService;
    public FabricService getFabricService() {
        return ;
    protected Object doExecute() throws Exception {
        FabricRequirements requirements = getFabricService().getRequirements();
        if (requirements == null) {
            requirements = new FabricRequirements();
        if (updateRequirements(requirements)) {
        return null;

Performs the updates on the requirements, returning true if the requirements are updated.
    protected abstract boolean updateRequirements(FabricRequirements requirements);
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