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CauldronContentType.java
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CauldronContentType.java
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package knightminer.inspirations.library.recipe.cauldron.contenttype;
import com.google.gson.JsonObject;
import com.google.gson.JsonSyntaxException;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.codec.EncoderException;
import knightminer.inspirations.library.recipe.cauldron.CauldronContentTypes;
import knightminer.inspirations.library.recipe.cauldron.contents.ICauldronContents;
import net.minecraft.nbt.CompoundNBT;
import net.minecraft.network.PacketBuffer;
import net.minecraft.util.JSONUtils;
import net.minecraftforge.common.util.Constants.NBT;
import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
/**
* Represents a type of contents that can be stored in the cauldron
* @param <C> {@link ICauldronContents} implementation for this type
*/
public abstract class CauldronContentType<C extends ICauldronContents, T> {
private final Map<T, C> cache = new HashMap<>();
private final Class<C> clazz;
private final Function<? super T, ? extends C> constructor;
private final Function<C, T> valueGetter;
private final String key;
/**
* Creates a new instance
* @param clazz Content type class for validation
* @param constructor Constructor to create contents from the type
* @param valueGetter Function to get the value from a content type
* @param key Key to use for serializing and deserializing
*/
protected CauldronContentType(Class<C> clazz, Function<? super T,? extends C> constructor, Function<C,T> valueGetter, String key) {
this.clazz = clazz;
this.constructor = constructor;
this.valueGetter = valueGetter;
this.key = key;
}
/**
* Creates a new instance using "name" as the serialization key
* @param clazz Content type class for validation
* @param constructor Constructor to create contents from the type
* @param valueGetter Function to get the value from a content type
*/
protected CauldronContentType(Class<C> clazz, Function<? super T,? extends C> constructor, Function<C,T> valueGetter) {
this(clazz, constructor, valueGetter, "name");
}
/* Base methods */
/**
* Checks if the given contents matches this type
* @param contents Contents to check
* @return True if the type matches
*/
public boolean matches(ICauldronContents contents) {
return clazz.isInstance(contents);
}
/**
* Gets the contents as this type
* @param contents Contents to fetch
* @return Type to get
*/
public Optional<T> get(ICauldronContents contents) {
if (clazz.isInstance(contents)) {
return Optional.of(clazz.cast(contents)).map(valueGetter);
}
return Optional.empty();
}
/* Creation methods */
/**
* Adds an override to this type, preventing the default constructor
* @param value Override to fetch
* @param instance Instance to use for override
*/
public void addOverride(T value, C instance) {
cache.put(value, instance);
}
/**
* Gets a value of the given type
* @param value Type of value
* @return Value to fetch
*/
public C of(T value) {
return cache.computeIfAbsent(value, constructor);
}
/* Serializing and deserializing */
/**
* Gets the name of the given value for writing to JSON and NBT
* @param value Value
* @return Name of the value
*/
public abstract String getName(T value);
/**
* Gets the entry for a given value
* @param name Name
* @return Entry, or null if missing
*/
@Nullable
public abstract T getEntry(String name);
/**
* Gets the key used for JSON and NBT
* @return JSON and NBT key
*/
public String getKey() {
return key;
}
/**
* Reads the given type from NBT
* @param tag NBT tag
* @return Read value
*/
@Nullable
public C read(CompoundNBT tag) {
if (tag.contains(key, NBT.TAG_STRING)) {
T value = getEntry(tag.getString(key));
if (value != null) {
return of(value);
}
}
return null;
}
/**
* Reads the given type from JSON
* @param json JSON object
* @return Read value=
* @throws com.google.gson.JsonSyntaxException if the JSON is invalid
*/
public C read(JsonObject json) {
String name = JSONUtils.getString(json, key);
T value = getEntry(name);
if (value == null) {
throw new JsonSyntaxException("Invalid name '" + name + "' for type '" + CauldronContentTypes.getName(this) + "'");
}
return of(value);
}
/**
* Reads the given type from the packet buffer
* @param buffer Packet buffer
* @return Read value
* @throws DecoderException if the type is invalid
*/
public C read(PacketBuffer buffer) {
String name = buffer.readString(Short.MAX_VALUE);
T value = getEntry(name);
if (value != null) {
return of(value);
}
throw new DecoderException("Invalid name '" + name + "' for type " + this);
}
/**
* Gets the name of the given value
* @param value Value
* @return Name of the value
*/
private String getName(C value) {
return getName(valueGetter.apply(value));
}
/**
* Writes the given type to NBT
* @param contents Contents to write
* @param tag NBT tag
*/
public void write(ICauldronContents contents, CompoundNBT tag) {
if (clazz.isInstance(contents)) {
tag.putString(key, getName(clazz.cast(contents)));
}
}
/**
* Writes the given type to JSON
* @param contents Contents to write
* @param json JSON object
*/
public void write(ICauldronContents contents, JsonObject json) {
if (clazz.isInstance(contents)) {
json.addProperty(key, getName(clazz.cast(contents)));
}
}
/**
* Writes the given type to the packet buffer
* @param contents Contents to write
* @param buffer Packet buffer
*/
public void write(ICauldronContents contents, PacketBuffer buffer) {
if (clazz.isInstance(contents)) {
buffer.writeString(getName(clazz.cast(contents)));
} else {
throw new EncoderException("Invalid type for contents argument");
}
}
@Override
public String toString() {
return String.format("CauldronContentType[%s]", CauldronContentTypes.getName(this));
}
}