/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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 android.location;

/**
 * This class represents the current state of a GPS satellite.
 * This class is used in conjunction with the {@link GpsStatus} class.
 */
public final class GpsSatellite {
    /* These package private values are modified by the GpsStatus class */
    boolean mValid;
    boolean mHasEphemeris;
    boolean mHasAlmanac;
    boolean mUsedInFix;
    int mPrn;
    float mSnr;
    float mElevation;
    float mAzimuth;

    GpsSatellite(int prn) {
        mPrn = prn;
    }

    /**
     * Used by {@link LocationManager#getGpsStatus} to copy LocationManager's
     * cached GpsStatus instance to the client's copy.
     */
    void setStatus(GpsSatellite satellite) {
        if (satellite == null) {
            mValid = false;
        } else {
            mValid = satellite.mValid;
            mHasEphemeris = satellite.mHasEphemeris;
            mHasAlmanac = satellite.mHasAlmanac;
            mUsedInFix = satellite.mUsedInFix;
            mSnr = satellite.mSnr;
            mElevation = satellite.mElevation;
            mAzimuth = satellite.mAzimuth;
        }
    }

    /**
     * Returns the PRN (pseudo-random number) for the satellite.
     *
     * @return PRN number
     */
    public int getPrn() {
        return mPrn;
    }

    /**
     * Returns the signal to noise ratio for the satellite.
     *
     * @return the signal to noise ratio
     */
    public float getSnr() {
        return mSnr;
    }

    /**
     * Returns the elevation of the satellite in degrees.
     * The elevation can vary between 0 and 90.
     *
     * @return the elevation in degrees
     */
    public float getElevation() {
        return mElevation;
    }

    /**
     * Returns the azimuth of the satellite in degrees.
     * The azimuth can vary between 0 and 360.
     *
     * @return the azimuth in degrees
     */
    public float getAzimuth() {
        return mAzimuth;
    }

    /**
     * Returns true if the GPS engine has ephemeris data for the satellite.
     *
     * @return true if the satellite has ephemeris data
     */
    public boolean hasEphemeris() {
        return mHasEphemeris;
    }

    /**
     * Returns true if the GPS engine has almanac data for the satellite.
     *
     * @return true if the satellite has almanac data
     */
    public boolean hasAlmanac() {
        return mHasAlmanac;
    }

    /**
     * Returns true if the satellite was used by the GPS engine when
     * calculating the most recent GPS fix.
     *
     * @return true if the satellite was used to compute the most recent fix.
     */
    public boolean usedInFix() {
        return mUsedInFix;
    }
}