type.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derby.impl.services.bytecode.Type

   Copyright 1999, 2004 The Apache Software Foundation or its licensors, as applicable.

   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 org.apache.derby.impl.services.bytecode;

import org.apache.derby.iapi.services.classfile.VMDescriptor;
import org.apache.derby.iapi.services.classfile.ClassHolder;

final class Type {

	static final Type LONG = new Type("long", VMDescriptor.LONG);
	static final Type INT = new Type("int", VMDescriptor.INT);
	static final Type SHORT = new Type("short", VMDescriptor.SHORT);
	static final Type BYTE = new Type("byte", VMDescriptor.BYTE);
	static final Type BOOLEAN = new Type("boolean", VMDescriptor.BOOLEAN);
	static final Type FLOAT = new Type("float", VMDescriptor.FLOAT);
	static final Type DOUBLE = new Type("double", VMDescriptor.DOUBLE);
	static final Type STRING = new Type("java.lang.String", "Ljava/lang/String;");

	private final String javaName; // e.g. java.lang.Object
	private final short vmType; // e.g. BCExpr.vm_reference
	private final String vmName; // e.g. Ljava/lang/Object;
	final String vmNameSimple; // e.g. java/lang/Object

	Type(String javaName, String vmName) {
		this.vmName = vmName;
		this.javaName = javaName;
		vmType = BCJava.vmTypeId(vmName);
		vmNameSimple = ClassHolder.convertToInternalClassName(javaName);
	}

	/*
	** Class specific methods.
	*/
	
	String javaName() {
		return javaName;
	}

	/**
	 * Get the VM Type name (java/lang/Object)
	 */
	String vmName() {
		return vmName;
	}
	/**
		Get the VM type (eg. VMDescriptor.INT)
	*/
	short vmType() {
		return vmType;
	}

	int width() {
		return Type.width(vmType);
	}

	static int width(short type) {
		switch (type) {
		case BCExpr.vm_void:
			return 0;
		case BCExpr.vm_long:
		case BCExpr.vm_double:
			return 2;
		default:
			return 1;
		}
	}
}