/
ListTag.java
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/
ListTag.java
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/*
* WorldEdit, a Minecraft world manipulation toolkit
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldEdit team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package net.aufdemrand.denizen.utilities.jnbt;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* The {@code TAG_List} tag.
*/
public final class ListTag extends Tag {
private final Class<? extends Tag> type;
private final List<Tag> value;
/**
* Creates the tag with an empty name.
*
* @param type the type of tag
* @param value the value of the tag
*/
public ListTag(Class<? extends Tag> type, List<? extends Tag> value) {
super();
checkNotNull(value);
this.type = type;
this.value = Collections.unmodifiableList(value);
}
/**
* Gets the type of item in this list.
*
* @return The type of item in this list.
*/
public Class<? extends Tag> getType() {
return type;
}
@Override
public List<Tag> getValue() {
return value;
}
/**
* Create a new list tag with this tag's name and type.
*
* @param list the new list
* @return a new list tag
*/
public ListTag setValue(List<Tag> list) {
return new ListTag(getType(), list);
}
/**
* Get the tag if it exists at the given index.
*
* @param index the index
* @return the tag or null
*/
@Nullable
public Tag getIfExists(int index) {
try {
return value.get(index);
} catch (NoSuchElementException e) {
return null;
}
}
/**
* Get a byte array named with the given index.
*
* <p>If the index does not exist or its value is not a byte array tag,
* then an empty byte array will be returned.</p>
*
* @param index the index
* @return a byte array
*/
public byte[] getByteArray(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ByteArrayTag) {
return ((ByteArrayTag) tag).getValue();
} else {
return new byte[0];
}
}
/**
* Get a byte named with the given index.
*
* <p>If the index does not exist or its value is not a byte tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a byte
*/
public byte getByte(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ByteTag) {
return ((ByteTag) tag).getValue();
} else {
return (byte) 0;
}
}
/**
* Get a double named with the given index.
*
* <p>If the index does not exist or its value is not a double tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a double
*/
public double getDouble(int index) {
Tag tag = getIfExists(index);
if (tag instanceof DoubleTag) {
return ((DoubleTag) tag).getValue();
} else {
return 0;
}
}
/**
* Get a double named with the given index, even if it's another
* type of number.
*
* <p>If the index does not exist or its value is not a number,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a double
*/
public double asDouble(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ByteTag) {
return ((ByteTag) tag).getValue();
} else if (tag instanceof ShortTag) {
return ((ShortTag) tag).getValue();
} else if (tag instanceof IntTag) {
return ((IntTag) tag).getValue();
} else if (tag instanceof LongTag) {
return ((LongTag) tag).getValue();
} else if (tag instanceof FloatTag) {
return ((FloatTag) tag).getValue();
} else if (tag instanceof DoubleTag) {
return ((DoubleTag) tag).getValue();
} else {
return 0;
}
}
/**
* Get a float named with the given index.
*
* <p>If the index does not exist or its value is not a float tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a float
*/
public float getFloat(int index) {
Tag tag = getIfExists(index);
if (tag instanceof FloatTag) {
return ((FloatTag) tag).getValue();
} else {
return 0;
}
}
/**
* Get a {@code int[]} named with the given index.
*
* <p>If the index does not exist or its value is not an int array tag,
* then an empty array will be returned.</p>
*
* @param index the index
* @return an int array
*/
public int[] getIntArray(int index) {
Tag tag = getIfExists(index);
if (tag instanceof IntArrayTag) {
return ((IntArrayTag) tag).getValue();
} else {
return new int[0];
}
}
/**
* Get an int named with the given index.
*
* <p>If the index does not exist or its value is not an int tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return an int
*/
public int getInt(int index) {
Tag tag = getIfExists(index);
if (tag instanceof IntTag) {
return ((IntTag) tag).getValue();
} else {
return 0;
}
}
/**
* Get an int named with the given index, even if it's another
* type of number.
*
* <p>If the index does not exist or its value is not a number,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return an int
*/
public int asInt(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ByteTag) {
return ((ByteTag) tag).getValue();
} else if (tag instanceof ShortTag) {
return ((ShortTag) tag).getValue();
} else if (tag instanceof IntTag) {
return ((IntTag) tag).getValue();
} else if (tag instanceof LongTag) {
return ((LongTag) tag).getValue().intValue();
} else if (tag instanceof FloatTag) {
return ((FloatTag) tag).getValue().intValue();
} else if (tag instanceof DoubleTag) {
return ((DoubleTag) tag).getValue().intValue();
} else {
return 0;
}
}
/**
* Get a list of tags named with the given index.
*
* <p>If the index does not exist or its value is not a list tag,
* then an empty list will be returned.</p>
*
* @param index the index
* @return a list of tags
*/
public List<Tag> getList(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ListTag) {
return ((ListTag) tag).getValue();
} else {
return Collections.emptyList();
}
}
/**
* Get a {@code TagList} named with the given index.
*
* <p>If the index does not exist or its value is not a list tag,
* then an empty tag list will be returned.</p>
*
* @param index the index
* @return a tag list instance
*/
public ListTag getListTag(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ListTag) {
return (ListTag) tag;
} else {
return new ListTag(StringTag.class, Collections.<Tag>emptyList());
}
}
/**
* Get a list of tags named with the given index.
*
* <p>If the index does not exist or its value is not a list tag,
* then an empty list will be returned. If the given index references
* a list but the list of of a different type, then an empty
* list will also be returned.</p>
*
* @param index the index
* @param listType the class of the contained type
* @return a list of tags
* @param <T> the NBT type
*/
@SuppressWarnings("unchecked")
public <T extends Tag> List<T> getList(int index, Class<T> listType) {
Tag tag = getIfExists(index);
if (tag instanceof ListTag) {
ListTag listTag = (ListTag) tag;
if (listTag.getType().equals(listType)) {
return (List<T>) listTag.getValue();
} else {
return Collections.emptyList();
}
} else {
return Collections.emptyList();
}
}
/**
* Get a long named with the given index.
*
* <p>If the index does not exist or its value is not a long tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a long
*/
public long getLong(int index) {
Tag tag = getIfExists(index);
if (tag instanceof LongTag) {
return ((LongTag) tag).getValue();
} else {
return 0L;
}
}
/**
* Get a long named with the given index, even if it's another
* type of number.
*
* <p>If the index does not exist or its value is not a number,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a long
*/
public long asLong(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ByteTag) {
return ((ByteTag) tag).getValue();
} else if (tag instanceof ShortTag) {
return ((ShortTag) tag).getValue();
} else if (tag instanceof IntTag) {
return ((IntTag) tag).getValue();
} else if (tag instanceof LongTag) {
return ((LongTag) tag).getValue();
} else if (tag instanceof FloatTag) {
return ((FloatTag) tag).getValue().longValue();
} else if (tag instanceof DoubleTag) {
return ((DoubleTag) tag).getValue().longValue();
} else {
return 0;
}
}
/**
* Get a short named with the given index.
*
* <p>If the index does not exist or its value is not a short tag,
* then {@code 0} will be returned.</p>
*
* @param index the index
* @return a short
*/
public short getShort(int index) {
Tag tag = getIfExists(index);
if (tag instanceof ShortTag) {
return ((ShortTag) tag).getValue();
} else {
return 0;
}
}
/**
* Get a string named with the given index.
*
* <p>If the index does not exist or its value is not a string tag,
* then {@code ""} will be returned.</p>
*
* @param index the index
* @return a string
*/
public String getString(int index) {
Tag tag = getIfExists(index);
if (tag instanceof StringTag) {
return ((StringTag) tag).getValue();
} else {
return "";
}
}
@Override
public String toString() {
StringBuilder bldr = new StringBuilder();
bldr.append("TAG_List").append(": ").append(value.size()).append(" entries of type ").append(NBTUtils.getTypeName(type)).append("\r\n{\r\n");
for (Tag t : value) {
bldr.append(" ").append(t.toString().replaceAll("\r\n", "\r\n ")).append("\r\n");
}
bldr.append("}");
return bldr.toString();
}
}