HttpRequestHeaderFieldDataOnDemand.java

/*******************************************************************************
 * Copyright 2011 André Rouél
 * 
 * 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 net.sf.jacclog.persistence.jpa;

import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import net.sf.jacclog.api.domain.http.HttpRequestHeader;
import net.sf.jacclog.persistence.jpa.entity.HttpRequestHeaderField;
import net.sf.jacclog.persistence.jpa.internal.HttpRequestHeaderFieldRepository;

public class HttpRequestHeaderFieldDataOnDemand {

	/**
	 * Test log entries
	 */
	private List<HttpRequestHeaderField> entries;

	private final HttpRequestHeaderFieldRepository repository;

	private final Random rnd = new SecureRandom();

	public HttpRequestHeaderFieldDataOnDemand(final HttpRequestHeaderFieldRepository repository) {
		if (repository == null) {
			throw new IllegalArgumentException("Argument 'repository' can not be null.");
		}

		this.repository = repository;
	}

	public HttpRequestHeaderField getNewTransientHttpRequestHeaderField(final int index) {
		return new HttpRequestHeaderField(HttpRequestHeader.HOST, index + ".jacclog.sf.net");
	}

	public HttpRequestHeaderField getRandomHttpRequestHeaderField() {
		initialize();
		final HttpRequestHeaderField field = entries.get(rnd.nextInt(entries.size()));
		return repository.find(field);
	}

	public HttpRequestHeaderField getSpecificHttpRequestHeaderField(int index) {
		initialize();
		if (index < 0) {
			index = 0;
		}
		if (index > (entries.size() - 1)) {
			index = entries.size() - 1;
		}
		final HttpRequestHeaderField field = entries.get(index);
		return repository.find(field);
	}

	public void initialize() {
		initialize(20);
	}

	/**
	 * Initialize the repository with self created log entries.
	 * 
	 * @param amount
	 *            Number of log entries to be created
	 */
	public void initialize(final int amount) {
		entries = repository.find(0, amount);
		if (entries == null) {
			throw new IllegalStateException(
					"Find entries implementation for 'HttpRequestHeaderFieldRepository' illegally returned null.");
		}
		if (!entries.isEmpty()) {
			return;
		}

		entries = new ArrayList<HttpRequestHeaderField>();
		for (int i = 0; i < amount; i++) {
			final HttpRequestHeaderField obj = getNewTransientHttpRequestHeaderField(i);
			repository.persist(obj);
			entries.add(obj);
		}
	}

	public boolean modifyHttpRequestHeaderField(final HttpRequestHeaderField obj) {
		return false;
	}

}