lubomir@281: /**
lubomir@281:  * Back 2 Browser Bytecode Translator
lubomir@281:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
lubomir@281:  *
lubomir@281:  * This program is free software: you can redistribute it and/or modify
lubomir@281:  * it under the terms of the GNU General Public License as published by
lubomir@281:  * the Free Software Foundation, version 2 of the License.
lubomir@281:  *
lubomir@281:  * This program is distributed in the hope that it will be useful,
lubomir@281:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
lubomir@281:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
lubomir@281:  * GNU General Public License for more details.
lubomir@281:  *
lubomir@281:  * You should have received a copy of the GNU General Public License
lubomir@281:  * along with this program. Look for COPYING file in the top folder.
lubomir@281:  * If not, see http://opensource.org/licenses/GPL-2.0.
lubomir@281:  */
lubomir@281: package org.apidesign.vm4brwsr;
lubomir@281: 
lubomir@281: public final class Variable implements CharSequence {
lubomir@281:     private static final String STACK_VAR_PREFIX = "st";
lubomir@307:     private static final String LOCAL_VAR_PREFIX = "lc";
lubomir@281: 
lubomir@281:     private final String name;
lubomir@281:     private final int type;
lubomir@281:     private final int index;
lubomir@281: 
lubomir@281:     private static final char[] TYPE_IDS = { 'I', 'L', 'F', 'D', 'A' };
lubomir@281: 
lubomir@281:     private Variable(final String prefix, final int type, final int index) {
lubomir@281:         this.name = prefix + TYPE_IDS[type] + index;
lubomir@281:         this.type = type;
lubomir@281:         this.index = index;
lubomir@281:     }
lubomir@281: 
lubomir@281:     public static Variable getStackVariable(
lubomir@281:             final int type, final int index) {
lubomir@281:         // TODO: precreate frequently used variables
lubomir@281:         return new Variable(STACK_VAR_PREFIX, type, index);
lubomir@281:     }
lubomir@281: 
lubomir@307:     public static Variable getLocalVariable(
lubomir@307:             final int type, final int index) {
lubomir@307:         // TODO: precreate frequently used variables
lubomir@307:         return new Variable(LOCAL_VAR_PREFIX, type, index);
lubomir@307:     }
lubomir@307: 
lubomir@281:     public String getName() {
lubomir@281:         return name;
lubomir@281:     }
lubomir@281: 
lubomir@281:     public int getType() {
lubomir@281:         return type;
lubomir@281:     }
lubomir@281: 
lubomir@281:     public int getIndex() {
lubomir@281:         return index;
lubomir@281:     }
lubomir@281: 
lubomir@281:     public boolean isCategory2() {
lubomir@307:         return VarType.isCategory2(type);
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public int length() {
lubomir@281:         return name.length();
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public char charAt(final int index) {
lubomir@281:         return name.charAt(index);
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public CharSequence subSequence(final int start, final int end) {
lubomir@281:         return name.subSequence(start, end);
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public int hashCode() {
lubomir@281:         return name.hashCode();
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public boolean equals(final Object other) {
lubomir@281:         if (this == other) {
lubomir@281:             return true;
lubomir@281:         }
lubomir@281:         if (!(other instanceof Variable)) {
lubomir@281:             return false;
lubomir@281:         }
lubomir@281: 
lubomir@281:         return name.equals(((Variable) other).name);
lubomir@281:     }
lubomir@281: 
lubomir@281:     @Override
lubomir@281:     public String toString() {
lubomir@281:         return name;
lubomir@281:     }
lubomir@281: }