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Diffstat (limited to 'src/main/java/org/apache/commons/math/util/DefaultTransformer.java')
-rw-r--r-- | src/main/java/org/apache/commons/math/util/DefaultTransformer.java | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math/util/DefaultTransformer.java b/src/main/java/org/apache/commons/math/util/DefaultTransformer.java new file mode 100644 index 0000000..e4579b2 --- /dev/null +++ b/src/main/java/org/apache/commons/math/util/DefaultTransformer.java @@ -0,0 +1,80 @@ +/* + * 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.commons.math.util; + +import java.io.Serializable; + +import org.apache.commons.math.MathException; +import org.apache.commons.math.exception.util.LocalizedFormats; + +/** + * A Default NumberTransformer for java.lang.Numbers and Numeric Strings. This + * provides some simple conversion capabilities to turn any java.lang.Number + * into a primitive double or to turn a String representation of a Number into + * a double. + * + * @version $Revision: 1073658 $ $Date: 2011-02-23 10:45:42 +0100 (mer. 23 févr. 2011) $ + */ +public class DefaultTransformer implements NumberTransformer, Serializable { + + /** Serializable version identifier */ + private static final long serialVersionUID = 4019938025047800455L; + + /** + * @param o the object that gets transformed. + * @return a double primitive representation of the Object o. + * @throws MathException if it cannot successfully be transformed. + * @see <a href="http://commons.apache.org/collections/api-release/org/apache/commons/collections/Transformer.html">Commons Collections Transformer</a> + */ + public double transform(Object o) throws MathException { + if (o == null) { + throw new MathException(LocalizedFormats.OBJECT_TRANSFORMATION); + } + + if (o instanceof Number) { + return ((Number)o).doubleValue(); + } + + try { + return Double.valueOf(o.toString()).doubleValue(); + } catch (NumberFormatException e) { + throw new MathException(e, + LocalizedFormats.CANNOT_TRANSFORM_TO_DOUBLE, e.getMessage()); + } + } + + /** {@inheritDoc} */ + @Override + public boolean equals(Object other) { + if (this == other) { + return true; + } + if (other == null) { + return false; + } + return other instanceof DefaultTransformer; + } + + /** {@inheritDoc} */ + @Override + public int hashCode() { + // some arbitrary number ... + return 401993047; + } + +} |