/*
 * Copyright (C) 2013 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.print;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * Represents a range of pages. The start and end page indices of
 * the range are zero based and inclusive.
 */
public final class PageRange implements Parcelable {

    /**
     * Constant for specifying all pages.
     */
    public static final PageRange ALL_PAGES = new PageRange(0, Integer.MAX_VALUE);

    private final int mStart;
    private final int mEnd;

    /**
     * Creates a new instance.
     *
     * @param start The start page index (zero based and inclusive).
     * @param end The end page index (zero based and inclusive).
     *
     * @throws IllegalArgumentException If start is less than zero.
     * @throws IllegalArgumentException If end is less than zero.
     * @throws IllegalArgumentException If start greater than end.
     */
    PageRange(int start, int end) {
        if (start < 0) {
            throw new IllegalArgumentException("start cannot be less than zero.");
        }
        if (end < 0) {
            throw new IllegalArgumentException("end cannot be less than zero.");
        }
        if (start > end) {
            throw new IllegalArgumentException("start must be lesser than end.");
        }
        mStart = start;
        mEnd = end;
    }

    private PageRange (Parcel parcel) {
        this(parcel.readInt(), parcel.readInt());
    }

    /**
     * Gets the start page index (zero based and inclusive).
     *
     * @return The start page index.
     */
    public int getStart() {
        return mStart;
    }

    /**
     * Gets the end page index (zero based and inclusive).
     *
     * @return The end page index.
     */
    public int getEnd() {
        return mEnd;
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel parcel, int flags) {
        parcel.writeInt(mStart);
        parcel.writeInt(mEnd);
    }

    @Override
    public String toString() {
        if (this == ALL_PAGES) {
            return "PageRange[<all pages>]";
        }
        StringBuilder builder = new StringBuilder();
        builder.append("PageRange[")
            .append(mStart)
            .append(" - ")
            .append(mEnd)
            .append("]");
        return builder.toString();
    }

    public static final Parcelable.Creator<PageRange> CREATOR =
            new Creator<PageRange>() {
        @Override
        public PageRange createFromParcel(Parcel parcel) {
            return new PageRange(parcel);
        }

        @Override
        public PageRange[] newArray(int size) {
            return new PageRange[size];
        }
    };
}