org.khannex.action.Command.java Source code

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Here is the source code for org.khannex.action.Command.java

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/*
 * Copyright 2016 David Lukacs
 *
 * 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.khannex.action;

import java.util.Base64;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;

import org.khannex.io.Response;
import org.khannex.io.ResponseBuilder;

public abstract class Command {

    private final List<String> params;
    private int paramPosition;

    public Command() {
        params = new LinkedList<>();
    }

    public abstract Response execute(Context context);

    public void addParam(String value) {
        if (value != null && !value.trim().isEmpty()) {
            if (org.apache.commons.codec.binary.Base64.isBase64(value.getBytes())) {
                params.add(new String(Base64.getDecoder().decode(value)));
            } else {
                params.add(value);
            }
        }
    }

    protected Optional<String> getNextParam() {
        if (paramPosition + 1 <= params.size()) {
            return Optional.of(params.get(paramPosition++));
        }

        return Optional.empty();
    }

    protected ResponseBuilder response() {
        return new ResponseBuilder();
    }

}