-HasFreeSpace condition (java6 only)

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@486150 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/condition/HasFreeSpace.java

@@ -0,0 +1,76 @@
+/*
+ *  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.
+ *
+ */
+
+package org.apache.tools.ant.taskdefs.condition;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.util.JavaEnvUtils;
+import org.apache.tools.ant.util.ReflectWrapper;
+import org.apache.tools.ant.util.StringUtils;
+
+/**
+ * <hasfreespace>
+ * <p>Condition returns true if selected partition 
+ * has the requested space, false otherwise.</p>
+ * @since Ant 1.7
+ */
+public class HasFreeSpace implements Condition {
+
+	private String partition;
+	private String needed;
+	
+	public boolean eval() throws BuildException {
+		try {
+			if (JavaEnvUtils.isAtLeastJavaVersion("1.6")) {
+				//reflection to avoid bootstrap/build problems
+				String j6FileUtils = "org.apache.tools.ant.util.java16.Java6FileUtils";
+				ReflectWrapper w = new ReflectWrapper(getClass().getClassLoader(), j6FileUtils);
+				long free = ((Long)w.invoke("freeSpace", String.class, partition)).longValue();
+				return free >= StringUtils.parseHumanSizes(needed);
+			} else {
+				throw new BuildException("HasFreeSpace condition not supported on Java5 or less.");
+			}
+		} catch (Exception e) {
+			throw new BuildException(e);
+		}
+	}
+
+	/**
+	 * The partition/device to check
+	 * @return
+	 */
+	public String getPartition() {
+		return partition;
+	}
+
+	public void setPartition(String partition) {
+		this.partition = partition;
+	}
+
+	/**
+	 * The amount of free space required
+	 * @return the amount required
+	 */
+	public String getNeeded() {
+		return needed;
+	}
+
+	public void setNeeded(String needed) {
+		this.needed = needed;
+	}
+}