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annotate graal/com.oracle.graal.phases/src/com/oracle/graal/phases/LazyName.java @ 18408:2c3666f44855

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Truffle: initial commit of object API implementation
author Andreas Woess <andreas.woess@jku.at>
date Tue, 18 Nov 2014 23:19:43 +0100
parents f3510d0dcf67
children b1530a6cce8c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.phases;
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24
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25 import com.oracle.graal.debug.*;
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26
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27 /**
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28 * A name whose {@link String} value is computed only when it is needed. This is useful in
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29 * combination with debugging facilities such as {@link Debug#scope(Object)} where the
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30 * {@link String} value of a name is only needed if debugging is enabled.
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31 */
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32 public abstract class LazyName implements CharSequence {
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33
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34 private String value;
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35
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36 public int length() {
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37 return toString().length();
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38 }
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39
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40 public char charAt(int index) {
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41 return toString().charAt(index);
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42 }
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43
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44 public CharSequence subSequence(int start, int end) {
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45 return toString().subSequence(start, end);
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46 }
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47
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48 @Override
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49 public final String toString() {
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50 if (value == null) {
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51 value = createString();
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52 }
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53 return value;
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54 }
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55
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56 /**
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57 * Creates the {@link String} value of this name.
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58 */
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59 protected abstract String createString();
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60 }