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A set of utilities and tools to speed up and ease programming in Java.
/*
* (c) 2005 David B. Bracewell
*
* 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 com.davidbracewell.conversion;
import com.davidbracewell.collection.PrimitiveArrayList;
import com.davidbracewell.logging.Logger;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.io.ByteStreams;
import com.google.common.io.CharStreams;
import com.google.common.primitives.Bytes;
import com.google.common.primitives.Chars;
import java.io.*;
import java.lang.reflect.Array;
import java.net.URI;
import java.net.URL;
import java.nio.file.Path;
import java.sql.Blob;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* The type Primitive array converter.
*
* @author David B. Bracewell
*/
public final class PrimitiveArrayConverter {
/**
* The constant BOOLEAN.
*/
public static final Function BOOLEAN = new Function() {
@Override
public boolean[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(boolean.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to boolean[].", input.getClass());
return null;
}
};
/**
* The constant BYTE.
*/
public static final Function BYTE = new Function() {
@Override
public byte[] apply( Object o) {
if (o == null) {
return null;
}
if (o instanceof byte[]) {
return Cast.as(o);
} else if (o instanceof Byte[]) {
return Bytes.toArray(Arrays.asList(Cast.as(o)));
} else if (o instanceof CharSequence) {
return o.toString().getBytes();
} else if (o.getClass().isArray() && o.getClass().getComponentType().isPrimitive()) {
return Bytes.toArray(new PrimitiveArrayList<>(o, Byte.class));
} else if (o.getClass().isArray()) {
byte[] bytes = new byte[Array.getLength(o)];
for (int i = 0; i < bytes.length; i++) {
bytes[i] = Convert.convert(Array.get(o, i), byte.class);
}
return bytes;
} else if (o instanceof File || o instanceof Path || o instanceof URI || o instanceof URL || o instanceof InputStream || o instanceof Blob) {
try (InputStream inputStream = IOConverter.INPUT_STREAM.apply(o)) {
if (inputStream == null) {
log.fine("Could not open input stream for {0}", o);
return null;
}
return ByteStreams.toByteArray(inputStream);
} catch (IOException e) {
log.fine("Error reading in {0}: {1}", o, e);
return null;
}
} else if (o instanceof Reader) {
try (Reader reader = Cast.as(o); ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
int read;
while ((read = reader.read()) != -1) {
baos.write(read);
}
return baos.toByteArray();
} catch (IOException e) {
log.fine(e);
return null;
}
}
Iterable iterable = CollectionConverter.ITERABLE.apply(o);
if (iterable != null) {
ArrayList bytes = new ArrayList<>();
for (Object comp : iterable) {
Byte b = Convert.convert(comp, Byte.class);
if (b != null) {
bytes.add(b);
}
}
if (!bytes.isEmpty()) {
return Bytes.toArray(bytes);
}
}
log.fine("Cannot convert {0} to byte[]", o.getClass());
return null;
}
};
/**
* The constant CHAR.
*/
public static final Function CHAR = new Function() {
@Override
public char[] apply( Object o) {
if (o == null) {
return null;
}
if (o instanceof char[]) {
return Cast.as(o);
} else if (o instanceof Character[]) {
return Chars.toArray(Arrays.asList(Cast.as(o)));
} else if (o instanceof CharSequence) {
return o.toString().toCharArray();
} else if (o.getClass().isArray() && o.getClass().getComponentType().isPrimitive()) {
return Chars.toArray(new PrimitiveArrayList<>(o, Character.class));
} else if (o.getClass().isArray()) {
char[] chars = new char[Array.getLength(o)];
for (int i = 0; i < chars.length; i++) {
chars[i] = Convert.convert(Array.get(o, i), char.class);
}
return chars;
} else if (o instanceof File || o instanceof Path || o instanceof URI || o instanceof URL || o instanceof InputStream || o instanceof Blob || o instanceof Reader) {
try (Reader reader = IOConverter.READER.apply(o)) {
if (reader == null) {
log.fine("Could not open reader for {0}", o);
return null;
}
return CharStreams.toString(reader).toCharArray();
} catch (IOException e) {
log.fine("Error reading in {0}: {1}", o, e);
return null;
}
}
Iterable iterable = CollectionConverter.ITERABLE.apply(o);
if (iterable != null) {
ArrayList chars = new ArrayList<>();
for (Object comp : iterable) {
Character c = Convert.convert(comp, Character.class);
if (c != null) {
chars.add(c);
}
}
if (!chars.isEmpty()) {
return Chars.toArray(chars);
}
}
log.fine("Cannot convert {0} to byte[]", o.getClass());
return null;
}
};
/**
* The constant DOUBLE.
*/
public static final Function DOUBLE = new Function() {
@Override
public double[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(double.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to double[].", input.getClass());
return null;
}
};
/**
* The constant FLOAT.
*/
public static final Function FLOAT = new Function() {
@Override
public float[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(float.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to float[].", input.getClass());
return null;
}
};
/**
* The constant INT.
*/
public static final Function INT = new Function() {
@Override
public int[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(int.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to int[].", input.getClass());
return null;
}
};
/**
* The constant LONG.
*/
public static final Function LONG = new Function() {
@Override
public long[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(long.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to long[].", input.getClass());
return null;
}
};
/**
* The constant SHORT.
*/
public static final Function SHORT = new Function() {
@Override
public short[] apply( Object input) {
if (input == null) {
return null;
}
Object o = convertToArray(short.class, input);
if (o != null) {
return Cast.as(o);
}
log.fine("Cannot convert {0} to short[].", input.getClass());
return null;
}
};
private static final Logger log = Logger.getLogger(PrimitiveArrayConverter.class);
private PrimitiveArrayConverter() {
}
private static Object convertToArray(Class itemClass, Object obj) {
if (obj.getClass().isArray() && obj.getClass().getComponentType().equals(itemClass)) {
return obj;
}
Iterable iterable = CollectionConverter.ITERABLE.apply(obj);
if (iterable == null) {
return null;
}
List list = Lists.newArrayList(iterable);
Object array = Array.newInstance(itemClass, list.size());
for (int i = 0; i < list.size(); i++) {
Array.set(array, i, Convert.convert(list.get(i), itemClass));
}
return array;
}
}//END OF PrimitiveArrayConverter
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