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C-Struct like features for Java 6+ to improve performance.
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/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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.
 */

package net.wpm.codegen;

import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;

import net.wpm.codegen.Context;
import net.wpm.codegen.Expression;
import net.wpm.codegen.ExpressionConstant;
import net.wpm.codegen.utils.Primitives;

import static java.lang.String.format;
import static net.wpm.codegen.Utils.exceptionInGeneratedClass;
import static net.wpm.codegen.utils.Preconditions.checkNotNull;
import static org.objectweb.asm.Type.getType;

/**
 * Defines methods to create a constant value
 */
public final class ExpressionConstant implements Expression {

	private final Object value;

	ExpressionConstant(Object value) {
		checkNotNull(value);
		this.value = value;
	}

	public Object getValue() {
		return value;
	}

	@Override
	public Type type(Context ctx) {
		if (value instanceof String) {
			return getType(String.class);
		} else if (value instanceof Type) {
			return (Type) value;
		} else {
			return getType(Primitives.unwrap(value.getClass()));
		}
	}

	@SuppressWarnings("rawtypes")
	@Override
	public Type load(Context ctx) {
		GeneratorAdapter g = ctx.getGeneratorAdapter();
		Type type = type(ctx);
		if (value instanceof Byte) {
			g.push((Byte) value);
		} else if (value instanceof Short) {
			g.push((Short) value);
		} else if (value instanceof Integer) {
			g.push((Integer) value);
		} else if (value instanceof Long) {
			g.push((Long) value);
		} else if (value instanceof Float) {
			g.push((Float) value);
		} else if (value instanceof Double) {
			g.push((Double) value);
		} else if (value instanceof Boolean) {
			g.push((Boolean) value);
		} else if (value instanceof Character) {
			g.push((Character) value);
		} else if (value instanceof String) {
			g.push((String) value);
		} else if (value instanceof Type) {
			g.push((Type) value);
		} else if (value instanceof Enum) {
			g.getStatic(type, ((Enum) value).name(), type);
		} else {
			throw new RuntimeException(format("%s is not primitive, wrapper, String, Type or Enum. %s",
					value.getClass(),
					exceptionInGeneratedClass(ctx))
			);
		}

		return type;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (o == null || getClass() != o.getClass()) return false;

		ExpressionConstant that = (ExpressionConstant) o;

		if (value != null ? !value.equals(that.value) : that.value != null) return false;

		return true;
	}

	@Override
	public int hashCode() {
		return value != null ? value.hashCode() : 0;
	}
}