protectrecord.java

java 读写word excel ppt

/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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 org.apache.poi.hssf.record;

import org.apache.poi.util.LittleEndian;

/**
 * Title: Protect Record<P>
 * Description:  defines whether a sheet or workbook is protected (HSSF DOES NOT SUPPORT ENCRYPTION)<P>
 * (kindly ask the US government to stop having arcane stupid encryption laws and we'll support it) <P>
 * (after all terrorists will all use US-legal encrypton right??)<P>
 * REFERENCE:  PG 373 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @version 2.0-pre
 */

public class ProtectRecord
    extends Record
{
    public final static short sid = 0x12;
    private short             field_1_protect;

    public ProtectRecord()
    {
    }

    /**
     * Constructs a Protect record and sets its fields appropriately.
     *
     * @param id id must be 0x12 or an exception will be throw upon validation
     * @param size size the size of the data area of the record
     * @param data data of the record (should not contain sid/len)
     */

    public ProtectRecord(RecordInputStream in)
    {
        super(in);
    }

    protected void validateSid(short id)
    {
        if (id != sid)
        {
            throw new RecordFormatException("NOT A PROTECT RECORD");
        }
    }

    protected void fillFields(RecordInputStream in)
    {
        field_1_protect = in.readShort();
    }

    /**
     * set whether the sheet is protected or not
     * @param protect whether to protect the sheet or not
     */

    public void setProtect(boolean protect)
    {
        if (protect)
        {
            field_1_protect = 1;
        }
        else
        {
            field_1_protect = 0;
        }
    }

    /**
     * get whether the sheet is protected or not
     * @return whether to protect the sheet or not
     */

    public boolean getProtect()
    {
        return (field_1_protect == 1);
    }

    public String toString()
    {
        StringBuffer buffer = new StringBuffer();

        buffer.append("[PROTECT]\n");
	    buffer.append("    .protect         = ").append(getProtect())
            .append("\n");
        buffer.append("[/PROTECT]\n");
        return buffer.toString();
    }

    public int serialize(int offset, byte [] data)
    {
        LittleEndian.putShort(data, 0 + offset, sid);
        LittleEndian.putShort(data, 2 + offset,
                              (( short ) 0x02));   // 2 bytes (6 total)
        LittleEndian.putShort(data, 4 + offset, field_1_protect);
        return getRecordSize();
    }

    public int getRecordSize()
    {
        return 6;
    }

    public short getSid()
    {
        return sid;
    }

    public Object clone() {
        ProtectRecord rec = new ProtectRecord();
        rec.field_1_protect = field_1_protect;
        return rec;
    }
}