/*
 * Copyright 2005 the original author or authors.
 *
 * Licensed 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.wamblee.security.authorization;

import org.wamblee.persistence.AbstractPersistent;


/**
 * Determiens if an operation is a subclass of a specified operation.
 */
public class IsaOperationCondition extends AbstractPersistent
    implements OperationCondition {
    /**
     * Operation that the other operation must be a subclass of.
     */
    private Class<?extends Operation> operation;

/**
     * Constructs the condition.
     * 
     * @param aOperation
     *            Operation that an operation must be an instance of.
     */
    public IsaOperationCondition(Class<?extends Operation> aOperation) {
        operation = aOperation;
    }

/**
     * For OR mapping.
     * 
     */
    public IsaOperationCondition() {
        operation = null;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.wamblee.security.authorization.OperationCondition#matches(org.wamblee.security.authorization.Operation)
     */
    /**
     * DOCUMENT ME!
     *
     * @param aOperation DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public boolean matches(Operation aOperation) {
        return operation.isInstance(aOperation);
    }

    /**
     * Gets the operation as a string. For OR mapping only.
     *
     * @return Operation string.
     */
    protected String getOperationString() {
        if (operation == null) {
            return null;
        }

        return operation.getName();
    }

    /**
     * Sets the operation as a string. For OR mapping only.
     *
     * @param aOperation Operation string.
     *
     * @throws IllegalArgumentException DOCUMENT ME!
     */
    protected void setOperationString(String aOperation) {
        if (aOperation == null) {
            return;
        }

        try {
            operation = (Class<?extends Operation>) Class.forName(aOperation);
        } catch (Exception e) {
            throw new IllegalArgumentException("Unknown class '" + aOperation
                + "'");
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#toString()
     */
    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    @Override
    public String toString() {
        return "IsaOperationCondition(operation=" + operation.getName() + ")";
    }
}