com.artemis.meta.ClassMetadataUtil Maven / Gradle / Ivy

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package com.artemis.meta;

import static org.objectweb.asm.Opcodes.ACC_FINAL;
import static org.objectweb.asm.Opcodes.ACC_STATIC;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public final class ClassMetadataUtil {
	
	private ClassMetadata meta;

	public ClassMetadataUtil(ClassMetadata meta) {
		this.meta = meta;
	}
	
	public static List instanceFields(ClassMetadata meta) {
		List instanceFields = new ArrayList();
		for (FieldDescriptor field : meta.fields()) {
			if ("$data".equals(field.name) || "$world".equals(field.name))
					continue;
			
			if ((field.access & (ACC_FINAL | ACC_STATIC)) == 0)
				instanceFields.add(field);
		}
		
		// sorting fields so that RW operations are type aligned
		Collections.sort(instanceFields, new PrimitiveSizeComparator());
		
		return instanceFields;
	}
	
	public boolean hasSetter(FieldDescriptor f) {
		String methodDesc = "(" + f.desc + ")";
		for (MethodDescriptor m : meta.methods) {
			if (m.name.equals(f.name) && m.desc.startsWith(methodDesc))
				return true;
		}
		
		return false;
	}
	
	public boolean hasGetter(FieldDescriptor f) {
		String methodDesc = "()" + f.desc;
		for (MethodDescriptor m : meta.methods) {
			if (m.name.equals(f.name) && m.desc.equals(methodDesc))
				return true;
		}
		
		return false;
	}
	
	public static Set instanceFieldTypes(ClassMetadata meta) {
		Set instanceFields = new HashSet();
		for (FieldDescriptor f : instanceFields(meta)) {
			instanceFields.add(f.desc);
		}
		return instanceFields;
	}
	
	public static String superName(ClassMetadata meta) {
		switch (meta.annotation) {
			case POOLED:
				return "com/artemis/PooledComponent";
			case NONE:
			default:
				throw new RuntimeException("Missing case : " + meta.annotation);
		}
	}
	
	public static int sizeOf(FieldDescriptor fd) {
		switch (fd.desc.charAt(0)) {
			case 'J': // long
			case 'D': // double
				return 8;
			case 'I': // int
			case 'F': // float
				return 4;
			case 'S': // short
			case 'C': // char
				return 2;
			case 'B': // byte
			case 'Z': // boolean
				return 1;
			case 'L': // object
				return 0;
			default:
				throw new RuntimeException("Unknown primtive type: " + fd.desc);
		}
	}
	
	public static int sizeOf(ClassMetadata meta) {
		int size = 0;
		for (FieldDescriptor fd : meta.fields()) {
			size +=  sizeOf(fd);
		}
		
		return size;
	}
	
	
	private static final class PrimitiveSizeComparator implements Comparator, Serializable {
		
		@Override
		public int compare(FieldDescriptor o1, FieldDescriptor o2) {
			return sizeOf(o1) - sizeOf(o2);
		}
	}
}