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/*
* Copyright 2002-2017 Drew Noakes
*
* 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.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.gif;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Directory;
import java.util.HashMap;
/**
* @author Drew Noakes https://drewnoakes.com
* @author Kevin Mott https://github.com/kwhopper
*/
@SuppressWarnings("WeakerAccess")
public class GifControlDirectory extends Directory
{
public static final int TAG_DELAY = 1;
public static final int TAG_DISPOSAL_METHOD = 2;
public static final int TAG_USER_INPUT_FLAG = 3;
public static final int TAG_TRANSPARENT_COLOR_FLAG = 4;
public static final int TAG_TRANSPARENT_COLOR_INDEX = 5;
@NotNull
protected static final HashMap<Integer, String> _tagNameMap = new HashMap<Integer, String>();
static
{
_tagNameMap.put(TAG_DELAY, "Delay");
_tagNameMap.put(TAG_DISPOSAL_METHOD, "Disposal Method");
_tagNameMap.put(TAG_USER_INPUT_FLAG, "User Input Flag");
_tagNameMap.put(TAG_TRANSPARENT_COLOR_FLAG, "Transparent Color Flag");
_tagNameMap.put(TAG_TRANSPARENT_COLOR_INDEX, "Transparent Color Index");
}
public GifControlDirectory()
{
this.setDescriptor(new GifControlDescriptor(this));
}
@Override
@NotNull
public String getName()
{
return "GIF Control";
}
/**
* @return The {@link DisposalMethod}.
*/
@NotNull
public DisposalMethod getDisposalMethod() {
return (DisposalMethod) getObject(TAG_DISPOSAL_METHOD);
}
/**
* @return Whether the GIF has transparency.
*/
public boolean isTransparent() {
Boolean transparent = getBooleanObject(TAG_TRANSPARENT_COLOR_FLAG);
return transparent != null && transparent;
}
@Override
@NotNull
protected HashMap<Integer, String> getTagNameMap()
{
return _tagNameMap;
}
/**
* Disposal method indicates the way in which the graphic is to be treated
* after being displayed.
*/
public enum DisposalMethod {
NOT_SPECIFIED,
DO_NOT_DISPOSE,
RESTORE_TO_BACKGROUND_COLOR,
RESTORE_TO_PREVIOUS,
TO_BE_DEFINED,
INVALID;
public static DisposalMethod typeOf(int value) {
switch (value) {
case 0: return NOT_SPECIFIED;
case 1: return DO_NOT_DISPOSE;
case 2: return RESTORE_TO_BACKGROUND_COLOR;
case 3: return RESTORE_TO_PREVIOUS;
case 4:
case 5:
case 6:
case 7: return TO_BE_DEFINED;
default: return INVALID;
}
}
@Override
public String toString() {
switch (this) {
case DO_NOT_DISPOSE:
return "Don't Dispose";
case INVALID:
return "Invalid value";
case NOT_SPECIFIED:
return "Not Specified";
case RESTORE_TO_BACKGROUND_COLOR:
return "Restore to Background Color";
case RESTORE_TO_PREVIOUS:
return "Restore to Previous";
case TO_BE_DEFINED:
return "To Be Defined";
default:
return super.toString();
}
}
}
}
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