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/*******************************************************************************
 *  Copyright (c) 2011 GitHub Inc.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  Contributors:
 *    Kevin Sawicki (GitHub Inc.) - initial API and implementation
 *******************************************************************************/
package com.jdroid.github.service;

import static com.jdroid.github.client.IGitHubConstants.SEGMENT_MILESTONES;
import static com.jdroid.github.client.IGitHubConstants.SEGMENT_REPOS;

import com.google.gson.reflect.TypeToken;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

import com.jdroid.github.IRepositoryIdProvider;
import com.jdroid.github.Milestone;
import com.jdroid.github.client.GitHubClient;
import com.jdroid.github.client.GitHubRequest;
import com.jdroid.github.client.PagedRequest;

/**
 * Milestone service class for listing the {@link Milestone} objects in use by a
 * repository and user accessed via a {@link GitHubClient}.
 *
 * @see GitHub
 *      milestones API documentation
 */
public class MilestoneService extends GitHubService {

	/**
	 * Create milestone service
	 */
	public MilestoneService() {
		super();
	}

	/**
	 * Create milestone service
	 *
	 * @param client
	 *            cannot be null
	 */
	public MilestoneService(GitHubClient client) {
		super(client);
	}

	/**
	 * Get milestones
	 *
	 * @param repository
	 * @param state
	 * @return list of milestones
	 * @throws IOException
	 */
	public List getMilestones(IRepositoryIdProvider repository,
			String state) throws IOException {
		String repoId = getId(repository);
		return getMilestones(repoId, state);
	}

	/**
	 * Get milestones
	 *
	 * @param user
	 * @param repository
	 * @param state
	 * @return list of milestones
	 * @throws IOException
	 */
	public List getMilestones(String user, String repository,
			String state) throws IOException {
		verifyRepository(user, repository);

		String repoId = user + '/' + repository;
		return getMilestones(repoId, state);
	}

	private List getMilestones(String id, String state)
			throws IOException {

		StringBuilder uri = new StringBuilder(SEGMENT_REPOS);
		uri.append('/').append(id);
		uri.append(SEGMENT_MILESTONES);
		PagedRequest request = createPagedRequest();
		if (state != null)
			request.setParams(Collections.singletonMap(
					IssueService.FILTER_STATE, state));
		request.setUri(uri).setType(new TypeToken>() {
		}.getType());
		return getAll(request);
	}

	/**
	 * Create a milestone
	 *
	 * @param repository
	 *            must be non-null
	 * @param milestone
	 *            must be non-null
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone createMilestone(IRepositoryIdProvider repository,
			Milestone milestone) throws IOException {
		String repoId = getId(repository);
		return createMilestone(repoId, milestone);
	}

	/**
	 * Create a milestone
	 *
	 * @param user
	 *            must be non-null
	 * @param repository
	 *            must be non-null
	 * @param milestone
	 *            must be non-null
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone createMilestone(String user, String repository,
			Milestone milestone) throws IOException {
		verifyRepository(user, repository);

		String repoId = user + '/' + repository;
		return createMilestone(repoId, milestone);
	}

	private Milestone createMilestone(String id, Milestone milestone)
			throws IOException {
		if (milestone == null)
			throw new IllegalArgumentException("Milestone cannot be null"); //$NON-NLS-1$

		StringBuilder uri = new StringBuilder(SEGMENT_REPOS);
		uri.append('/').append(id);
		uri.append(SEGMENT_MILESTONES);
		return client.post(uri.toString(), milestone, Milestone.class);
	}

	/**
	 * Get a milestone
	 *
	 * @param repository
	 *            must be non-null
	 * @param number
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone getMilestone(IRepositoryIdProvider repository, int number)
			throws IOException {
		return getMilestone(repository, Integer.toString(number));
	}

	/**
	 * Get a milestone
	 *
	 * @param repository
	 *            must be non-null
	 * @param number
	 *            must be non-null
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone getMilestone(IRepositoryIdProvider repository,
			String number) throws IOException {
		String repoId = getId(repository);
		return getMilestone(repoId, number);
	}

	/**
	 * Get a milestone
	 *
	 * @param user
	 *            must be non-null
	 * @param repository
	 *            must be non-null
	 * @param number
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone getMilestone(String user, String repository, int number)
			throws IOException {
		return getMilestone(user, repository, Integer.toString(number));
	}

	/**
	 * Get a milestone
	 *
	 * @param user
	 *            must be non-null
	 * @param repository
	 *            must be non-null
	 * @param number
	 *            must be non-null
	 * @return created milestone
	 * @throws IOException
	 */
	public Milestone getMilestone(String user, String repository, String number)
			throws IOException {
		verifyRepository(user, repository);

		String repoId = user + '/' + repository;
		return getMilestone(repoId, number);
	}

	private Milestone getMilestone(String id, String number) throws IOException {
		if (number == null)
			throw new IllegalArgumentException("Milestone cannot be null"); //$NON-NLS-1$
		if (number.length() == 0)
			throw new IllegalArgumentException("Milestone cannot be empty"); //$NON-NLS-1$

		StringBuilder uri = new StringBuilder(SEGMENT_REPOS);
		uri.append('/').append(id);
		uri.append(SEGMENT_MILESTONES);
		uri.append('/').append(number);
		GitHubRequest request = createRequest();
		request.setUri(uri);
		request.setType(Milestone.class);
		return (Milestone) client.get(request).getBody();
	}

	/**
	 * Delete a milestone with the given id from the given repository
	 *
	 * @param repository
	 * @param milestone
	 * @throws IOException
	 */
	public void deleteMilestone(IRepositoryIdProvider repository, int milestone)
			throws IOException {
		deleteMilestone(repository, Integer.toString(milestone));
	}

	/**
	 * Delete a milestone with the given id from the given repository
	 *
	 * @param repository
	 * @param milestone
	 * @throws IOException
	 */
	public void deleteMilestone(IRepositoryIdProvider repository,
			String milestone) throws IOException {
		String repoId = getId(repository);
		deleteMilestone(repoId, milestone);
	}

	/**
	 * Delete a milestone with the given id from the given repository
	 *
	 * @param user
	 * @param repository
	 * @param milestone
	 * @throws IOException
	 */
	public void deleteMilestone(String user, String repository, int milestone)
			throws IOException {
		deleteMilestone(user, repository, Integer.toString(milestone));
	}

	/**
	 * Delete a milestone with the given id from the given repository
	 *
	 * @param user
	 * @param repository
	 * @param milestone
	 * @throws IOException
	 */
	public void deleteMilestone(String user, String repository, String milestone)
			throws IOException {
		verifyRepository(user, repository);

		String repoId = user + '/' + repository;
		deleteMilestone(repoId, milestone);
	}

	private void deleteMilestone(String id, String milestone)
			throws IOException {
		if (milestone == null)
			throw new IllegalArgumentException("Milestone cannot be null"); //$NON-NLS-1$
		if (milestone.length() == 0)
			throw new IllegalArgumentException("Milestone cannot be empty"); //$NON-NLS-1$

		StringBuilder uri = new StringBuilder(SEGMENT_REPOS);
		uri.append('/').append(id);
		uri.append(SEGMENT_MILESTONES);
		uri.append('/').append(milestone);
		client.delete(uri.toString());
	}

	/**
	 * Edit the given milestone in the given repository
	 *
	 * @param repository
	 * @param milestone
	 * @return edited milestone
	 * @throws IOException
	 */
	public Milestone editMilestone(IRepositoryIdProvider repository,
			Milestone milestone) throws IOException {
		String repoId = getId(repository);
		if (milestone == null)
			throw new IllegalArgumentException("Milestone cannot be null"); //$NON-NLS-1$

		StringBuilder uri = new StringBuilder(SEGMENT_REPOS);
		uri.append('/').append(repoId);
		uri.append(SEGMENT_MILESTONES);
		uri.append('/').append(milestone.getNumber());

		return client.post(uri.toString(), milestone, Milestone.class);
	}
}




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