1 /*
2 * (c) Copyright 2006-2020 by rapiddweller GmbH & Volker Bergmann. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, is permitted under the terms of the
6 * GNU General Public License.
7 *
8 * For redistributing this software or a derivative work under a license other
9 * than the GPL-compatible Free Software License as defined by the Free
10 * Software Foundation or approved by OSI, you must first obtain a commercial
11 * license to this software product from rapiddweller GmbH & Volker Bergmann.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
14 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
15 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
17 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 package com.rapiddweller.benerator.engine.expression;
28
29 import com.rapiddweller.common.Context;
30 import com.rapiddweller.format.script.ScriptUtil;
31 import com.rapiddweller.script.Expression;
32 import com.rapiddweller.script.expression.ConstantExpression;
33 import com.rapiddweller.script.expression.DynamicExpression;
34
35 /**
36 * Evaluates a string which may be a script (indicated by {}).<br/><br/>
37 * Created: 19.02.2010 10:39:29
38 *
39 * @author Volker Bergmann
40 * @since 0.6.0
41 */
42 public class ScriptableExpression extends DynamicExpression<Object> {
43
44 private final String scriptOrText;
45 private final Expression<?> defaultValueExpression;
46 private final boolean isScript;
47
48 /**
49 * Instantiates a new Scriptable expression.
50 *
51 * @param scriptOrText the script or text
52 * @param defaultValue the default value
53 */
54 public ScriptableExpression(String scriptOrText, Object defaultValue) {
55 this(scriptOrText, (defaultValue != null ? new ConstantExpression<>(defaultValue) : null));
56 }
57
58 private ScriptableExpression(String scriptOrText, Expression<?> defaultValueExpression) {
59 this.defaultValueExpression = defaultValueExpression;
60 this.isScript = ScriptUtil.isScript(scriptOrText);
61 this.scriptOrText = scriptOrText;
62 }
63
64 /**
65 * Create with default expression expression.
66 *
67 * @param scriptOrText the script or text
68 * @param defaultValueExpression the default value expression
69 * @return the expression
70 */
71 public static Expression<?> createWithDefaultExpression(
72 String scriptOrText, Expression<?> defaultValueExpression) {
73 return new ScriptableExpression(scriptOrText, defaultValueExpression);
74 }
75
76 @Override
77 public Object evaluate(Context context) {
78 Object result;
79 if (scriptOrText == null) {
80 result = (defaultValueExpression != null ? defaultValueExpression.evaluate(context) : null);
81 } else if (isScript) {
82 result = ScriptUtil.evaluate(scriptOrText, context);
83 } else {
84 result = scriptOrText;
85 }
86 return result;
87 }
88
89 @Override
90 public String toString() {
91 return (ScriptUtil.isScript(scriptOrText) ? scriptOrText : "'" + scriptOrText + "'");
92 }
93
94 }