lubomir@319: /**
lubomir@319:  * Back 2 Browser Bytecode Translator
lubomir@319:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
lubomir@319:  *
lubomir@319:  * This program is free software: you can redistribute it and/or modify
lubomir@319:  * it under the terms of the GNU General Public License as published by
lubomir@319:  * the Free Software Foundation, version 2 of the License.
lubomir@319:  *
lubomir@319:  * This program is distributed in the hope that it will be useful,
lubomir@319:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
lubomir@319:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
lubomir@319:  * GNU General Public License for more details.
lubomir@319:  *
lubomir@319:  * You should have received a copy of the GNU General Public License
lubomir@319:  * along with this program. Look for COPYING file in the top folder.
lubomir@319:  * If not, see http://opensource.org/licenses/GPL-2.0.
lubomir@319:  */
lubomir@319: package org.apidesign.vm4brwsr;
lubomir@319: 
lubomir@319: final class Variable implements CharSequence {
lubomir@319:     private static final String STACK_VAR_PREFIX = "st";
lubomir@319:     private static final String LOCAL_VAR_PREFIX = "lc";
lubomir@319: 
lubomir@319:     private final String name;
lubomir@319:     private final int type;
lubomir@319:     private final int index;
lubomir@319: 
lubomir@319:     private static final char[] TYPE_IDS = { 'I', 'L', 'F', 'D', 'A' };
lubomir@319: 
lubomir@319:     private Variable(final String prefix, final int type, final int index) {
lubomir@319:         this.name = prefix + TYPE_IDS[type] + index;
lubomir@319:         this.type = type;
lubomir@319:         this.index = index;
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static Variable getStackVariable(
lubomir@319:             final int type, final int index) {
lubomir@319:         // TODO: precreate frequently used variables
lubomir@319:         return new Variable(STACK_VAR_PREFIX, type, index);
lubomir@319:     }
lubomir@319: 
lubomir@319:     public static Variable getLocalVariable(
lubomir@319:             final int type, final int index) {
lubomir@319:         // TODO: precreate frequently used variables
lubomir@319:         return new Variable(LOCAL_VAR_PREFIX, type, index);
lubomir@319:     }
lubomir@319: 
lubomir@319:     public String getName() {
lubomir@319:         return name;
lubomir@319:     }
lubomir@319: 
lubomir@319:     public int getType() {
lubomir@319:         return type;
lubomir@319:     }
lubomir@319: 
lubomir@319:     public int getIndex() {
lubomir@319:         return index;
lubomir@319:     }
lubomir@319: 
lubomir@319:     public boolean isCategory2() {
lubomir@319:         return VarType.isCategory2(type);
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public int length() {
lubomir@319:         return name.length();
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public char charAt(final int index) {
lubomir@319:         return name.charAt(index);
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public CharSequence subSequence(final int start, final int end) {
lubomir@319:         return name.subSequence(start, end);
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public int hashCode() {
lubomir@319:         return name.hashCode();
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public boolean equals(final Object other) {
lubomir@319:         if (this == other) {
lubomir@319:             return true;
lubomir@319:         }
lubomir@319:         if (!(other instanceof Variable)) {
lubomir@319:             return false;
lubomir@319:         }
lubomir@319: 
lubomir@319:         return name.equals(((Variable) other).name);
lubomir@319:     }
lubomir@319: 
lubomir@319:     @Override
lubomir@319:     public String toString() {
lubomir@319:         return name;
lubomir@319:     }
lubomir@319: }