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java/org/apache/el/parser/AstEmpty.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* Generated By:JJTree: Do not edit this line. AstEmpty.java */
+
+package org.apache.el.parser;
+
+import java.util.Collection;
+import java.util.Map;
+
+import javax.el.ELException;
+
+import org.apache.el.lang.EvaluationContext;
+
+
+/**
+ * @author Jacob Hookom [jacob@hookom.net]
+ */
+public final class AstEmpty extends SimpleNode {
+    public AstEmpty(int id) {
+        super(id);
+    }
+
+    @Override
+    public Class<?> getType(EvaluationContext ctx)
+            throws ELException {
+        return Boolean.class;
+    }
+
+    @Override
+    public Object getValue(EvaluationContext ctx)
+            throws ELException {
+        Object obj = this.children[0].getValue(ctx);
+        if (obj == null) {
+            return Boolean.TRUE;
+        } else if (obj instanceof String) {
+            return Boolean.valueOf(((String) obj).length() == 0);
+        } else if (obj instanceof Object[]) {
+            return Boolean.valueOf(((Object[]) obj).length == 0);
+        } else if (obj instanceof Collection<?>) {
+            return Boolean.valueOf(((Collection<?>) obj).isEmpty());
+        } else if (obj instanceof Map<?,?>) {
+            return Boolean.valueOf(((Map<?,?>) obj).isEmpty());
+        }
+        return Boolean.FALSE;
+    }
+}