de.factoryfx.data.attribute.ImmutableValueAttribute Maven / Gradle / Ivy

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package de.factoryfx.data.attribute;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;

import com.fasterxml.jackson.annotation.JsonValue;
import de.factoryfx.data.Data;

/** base class for Attributes with immutable value(for Changelistener)*/
public abstract class ImmutableValueAttribute> extends Attribute {
    //    @JsonProperty
    protected T value;
    private final Class dataType;

    public ImmutableValueAttribute(Class dataType) {
        super();
        this.dataType=dataType;
    }

    @Override
    public boolean internal_match(T value) {
        return Objects.equals(this.value, value);
    }

    @Override
    public void internal_fixDuplicateObjects(Map idToDataMap) {
        //do nothing
    }

    @Override
    public T get() {
        return value;
    }

    @Override
    public void set(T value) {
        this.value = value;
        if (listeners!=null){
            updateListeners(value);
        }
    }

    List> listeners;

    protected void updateListeners(T value){
        if (listeners==null){
            return;
        }
        for (AttributeChangeListener listener: listeners){
            listener.changed(this,value);
        }
    }

    protected boolean listenersEmpty(){
        if (listeners==null){
            return true;
        }
        return listeners.isEmpty();
    }

    //override to change copy e.g mutable value
    protected void copyTo(Attribute copyAttribute){
        copyAttribute.set(get());
    }

    @Override
    public void internal_copyTo(A copyAttribute, Function dataCopyProvider) {
        copyTo(copyAttribute);
    }

    @Override
    public void internal_semanticCopyTo(A copyAttribute) {
        copyTo(copyAttribute);
    }

    @Override
    public void internal_addListener(AttributeChangeListener listener) {
        if (listeners==null){
            listeners=new ArrayList<>();
        }
        listeners.add(listener);
    }

    @Override
    public void internal_removeListener(AttributeChangeListener listener) {
        if (listeners==null){
            return;
        }
        for (AttributeChangeListener listenerItem: new ArrayList<>(listeners)){
            if (listenerItem.unwrap()==listener || listenerItem.unwrap()==null){
                listeners.remove(listenerItem);
            }
        }
    }

    @Override
    public String getDisplayText() {
        if (value!=null){
            return value.toString();
        }
        return "";
    }

    @Override
    public AttributeTypeInfo internal_getAttributeType() {
        return new AttributeTypeInfo(dataType);
    }

    @JsonValue
    protected T getValue() {
        return get();
    }

    @JsonValue
    protected void setValue(T value) {
        set(value);
    }

}