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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.
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 ****************************************************************************/

package org.apache.pdfbox.preflight.action;

import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_ACTION_FORBIDDEN_ADDITIONAL_ACTION;

import java.util.List;

import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.preflight.PreflightContext;
import org.apache.pdfbox.preflight.ValidationResult.ValidationError;
import org.apache.pdfbox.preflight.exception.ValidationException;

public abstract class AbstractActionManager
{
    /**
     * ActionManager factory used to create new ActionManager
     */
    protected ActionManagerFactory actionFact = null;
    /**
     * Action name in a Additional Action dictionary
     */
    protected String aaKey = null;
    /**
     * The action dictionary checked by this class
     */
    protected COSDictionary actionDictionnary = null;
    /**
     * The validation context
     */
    protected PreflightContext context = null;

    /**
     * 
     * @param amFact
     *            Instance of ActionManagerFactory used to create ActionManager to check Next actions.
     * @param adict
     *            the COSDictionary of the action wrapped by this class.
     * @param ctx
     *            the validation context .
     * @param aaKey
     *            The name of the key which identify the action in a additional action dictionary.
     */
    AbstractActionManager(ActionManagerFactory amFact, COSDictionary adict, PreflightContext ctx, String aaKey)
    {
        this.actionFact = amFact;
        this.actionDictionnary = adict;
        this.aaKey = aaKey;
        this.context = ctx;
    }

    /**
     * @return the isAdditionalAction
     */
    public boolean isAdditionalAction()
    {
        return this.aaKey != null;
    }

    /**
     * @return the actionDictionnary
     */
    public COSDictionary getActionDictionnary()
    {
        return actionDictionnary;
    }

    /**
     * @return the aaKey
     */
    public String getAdditionalActionKey()
    {
        return aaKey;
    }

    /**
     * This method create a list of Action Managers which represent actions in the Next entry of the current action
     * dictionary. For each Next Action, the innerValid is called and the method returns false if a validation fails.
     * 
     * @return True if all Next Action are valid, false otherwise.
     * @throws ValidationException
     */
    protected boolean validNextActions() throws ValidationException
    {
        List<AbstractActionManager> lActions = this.actionFact.getNextActions(this.context, this.actionDictionnary);
        for (AbstractActionManager nAction : lActions)
        {
            if (!nAction.innerValid())
            {
                return false;
            }
        }
        return true;
    }

    /**
     * Call the {@link AbstractActionManager#valid(boolean)} method with the additionalActionAuth set to false.
     * 
     * @return the validation state.
     * @throws ValidationException
     */
    public boolean valid() throws ValidationException
    {
        return valid(false);
    }

    /**
     * Validate an Action dictionary.
     * 
     * Return false if the dictionary is invalid (ex : missing key). If the ActionManager represents an
     * AdditionalAction, this method returns false and updates the error list when the additonalActionAuth parameter is
     * set to false.
     * 
     * This method call the innerValid method to process specific checks according to the action type.
     * 
     * If innerValid successes, all actions contained in the Next entry of the Action dictionary are validated.
     * 
     * @param additonalActionAuth
     *            boolean to know if an additional action is authorized.
     * @return the validation state of the Action dictionary.
     * @throws ValidationException
     */
    public boolean valid(boolean additonalActionAuth) throws ValidationException
    {
        if (isAdditionalAction() && !additonalActionAuth)
        {
            context.addValidationError(new ValidationError(ERROR_ACTION_FORBIDDEN_ADDITIONAL_ACTION,
                    "Additional Action are forbidden"));
            return false;
        }

        if (innerValid())
        {
            return validNextActions();
        }

        return true;
    }

    /**
     * This method must be implemented by inherited classes to process specific validation.
     * 
     * @return True if the action is valid, false otherwise.
     */
    protected abstract boolean innerValid() throws ValidationException;
}

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