/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.xml.internal.bind.v2.runtime.unmarshaller;

import java.io.IOException;

import com.sun.xml.internal.bind.v2.runtime.output.Pcdata;

import com.sun.xml.internal.bind.v2.runtime.output.UTF8XmlOutput;

/**

 * Typed {@link CharSequence} for int[].

 *

 * <p>

 * Fed to unmarshaller when the 'text' data is actually

 * a virtual image of int array.

 *

 * <p>

 * This class holds int[] as a triplet of (data,start,len)

 * where 'start' and 'len' represents the start position of the

 * data and the length.

 *

 * @author Kohsuke Kawaguchi

 */

public final class IntArrayData extends Pcdata {

    private int[] data;

    private int start;

    private int len;

    /**

     * String representation of the data. Lazily computed.

     */

    private StringBuilder literal;

    public IntArrayData(int[] data, int start, int len) {

        set(data, start, len);

    }

    public IntArrayData() {

    }

    /**

     * Sets the int[] data to this object.

     *

     * <p>

     * This method doesn't make a copy for a performance reason.

     * The caller is still free to modify the array it passed to this method,

     * but he should do so with a care. The unmarshalling code isn't expecting

     * the value to be changed while it's being routed.

     */

    public void set(int[] data, int start, int len) {

        this.data = data;

        this.start = start;

        this.len = len;

        this.literal = null;

    }

    public int length() {

        return getLiteral().length();

    }

    public char charAt(int index) {

        return getLiteral().charAt(index);

    }

    public CharSequence subSequence(int start, int end) {

        return getLiteral().subSequence(start,end);

    }

    /**

     * Computes the literal form from the data.

     */

    private StringBuilder getLiteral() {

        if(literal!=null)   return literal;

        literal = new StringBuilder();

        int p = start;

        for( int i=len; i>0; i-- ) {

            if(literal.length()>0)  literal.append(' ');

            literal.append(data[p++]);

        }

        return literal;

    }

    public String toString() {

        return literal.toString();

    }

    public void writeTo(UTF8XmlOutput output) throws IOException {

        int p = start;

        for( int i=len; i>0; i-- ) {

            if(i!=len)

                output.write(' ');

            output.text(data[p++]);

        }

    }

}