1 files changed, 115 insertions, 0 deletions
diff --git a/javaparser-core/src/main/java/com/github/javaparser/printer/concretesyntaxmodel/CsmConditional.java b/javaparser-core/src/main/java/com/github/javaparser/printer/concretesyntaxmodel/CsmConditional.java
new file mode 100644
index 000000000..a2ca7cdd1
--- /dev/null
+++ b/javaparser-core/src/main/java/com/github/javaparser/printer/concretesyntaxmodel/CsmConditional.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
+ * Copyright (C) 2011, 2013-2016 The JavaParser Team.
+ *
+ * This file is part of JavaParser.
+ *
+ * JavaParser can be used either under the terms of
+ * a) the GNU Lesser General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * b) the terms of the Apache License
+ *
+ * You should have received a copy of both licenses in LICENCE.LGPL and
+ * LICENCE.APACHE. Please refer to those files for details.
+ *
+ * JavaParser is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+package com.github.javaparser.printer.concretesyntaxmodel;
+
+import com.github.javaparser.ast.Node;
+import com.github.javaparser.ast.NodeList;
+import com.github.javaparser.ast.observer.ObservableProperty;
+import com.github.javaparser.printer.SourcePrinter;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class CsmConditional implements CsmElement {
+    private final Condition condition;
+    private final List<ObservableProperty> properties;
+    private final CsmElement thenElement;
+    private final CsmElement elseElement;
+
+    public Condition getCondition() {
+        return condition;
+    }
+
+    public ObservableProperty getProperty() {
+        if (properties.size() > 1) {
+            throw new IllegalStateException();
+        }
+        return properties.get(0);
+    }
+
+    public CsmElement getThenElement() {
+        return thenElement;
+    }
+
+    public CsmElement getElseElement() {
+        return elseElement;
+    }
+
+    public enum Condition {
+        IS_EMPTY,
+        IS_NOT_EMPTY,
+        IS_PRESENT,
+        FLAG;
+
+        boolean evaluate(Node node, ObservableProperty property){
+            if (this == IS_PRESENT) {
+                return !property.isNullOrNotPresent(node);
+            }
+            if (this == FLAG) {
+                return property.getValueAsBooleanAttribute(node);
+            }
+            if (this == IS_EMPTY) {
+                NodeList value = property.getValueAsMultipleReference(node);
+                return value == null || value.isEmpty();
+            }
+            if (this == IS_NOT_EMPTY) {
+                NodeList value = property.getValueAsMultipleReference(node);
+                return value != null && !value.isEmpty();
+            }
+            throw new UnsupportedOperationException(name());
+        }
+    }
+
+    public CsmConditional(ObservableProperty property, Condition condition, CsmElement thenElement, CsmElement elseElement) {
+        this.properties = Arrays.asList(property);
+        this.condition = condition;
+        this.thenElement = thenElement;
+        this.elseElement = elseElement;
+    }
+
+    public CsmConditional(List<ObservableProperty> properties, Condition condition, CsmElement thenElement, CsmElement elseElement) {
+        if (properties.size() < 1) {
+            throw new IllegalArgumentException();
+        }
+        this.properties = properties;
+        this.condition = condition;
+        this.thenElement = thenElement;
+        this.elseElement = elseElement;
+    }
+
+    public CsmConditional(ObservableProperty property, Condition condition, CsmElement thenElement) {
+        this(property, condition, thenElement, new CsmNone());
+    }
+
+    @Override
+    public void prettyPrint(Node node, SourcePrinter printer) {
+        boolean test = false;
+        for (ObservableProperty prop : properties) {
+            test = test || condition.evaluate(node, prop);
+        }
+        if (test) {
+            thenElement.prettyPrint(node, printer);
+        } else {
+            elseElement.prettyPrint(node, printer);
+        }
+    }
+}