/*
* 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.types.selectors;
import java.io.File;
import org.apache.tools.ant.types.Comparison;
import org.apache.tools.ant.types.EnumeratedAttribute;
import org.apache.tools.ant.types.Parameter;
/**
* Selector that filters files based on their size.
*
* @since 1.5
*/
public class SizeSelector extends BaseExtendSelector {
/** Used for parameterized custom selector */
public static final String SIZE_KEY = "value";
/** Used for parameterized custom selector */
public static final String UNITS_KEY = "units";
/** Used for parameterized custom selector */
public static final String WHEN_KEY = "when";
private long size = -1;
private long multiplier = 1;
private long sizelimit = -1;
private Comparison when = Comparison.EQUAL;
/**
* Creates a new <code>SizeSelector</code> instance.
*
*/
public SizeSelector() {
}
/**
* Returns a <code>String</code> object representing the specified
* SizeSelector. This is "{sizeselector value: " + <"compare",
* "less", "more", "equal"> + "}".
* @return a string describing this object
*/
public String toString() {
StringBuffer buf = new StringBuffer("{sizeselector value: ");
buf.append(sizelimit);
buf.append("compare: ").append(when.getValue());
buf.append("}");
return buf.toString();
}
/**
* A size selector needs to know what size to base its selecting on.
* This will be further modified by the multiplier to get an
* actual size limit.
*
* @param size the size to select against expressed in units.
*/
public void setValue(long size) {
this.size = size;
if (multiplier != 0 && size > -1) {
sizelimit = size * multiplier;
}
}
/**
* Sets the units to use for the comparison. This is a little
* complicated because common usage has created standards that
* play havoc with capitalization rules. Thus, some people will
* use "K" for indicating 1000's, when the SI standard calls for
* "k". Others have tried to introduce "K" as a multiple of 1024,
* but that falls down when you reach "M", since "m" is already
* defined as 0.001.
* <p>
* To get around this complexity, a number of standards bodies
* have proposed the 2^10 standard, and at least one has adopted
* it. But we are still left with a populace that isn't clear on
* how capitalization should work.
* <p>
* We therefore ignore capitalization as much as possible.
* Completely mixed case is not possible, but all upper and lower
* forms are accepted for all long and short forms. Since we have
* no need to work with the 0.001 case, this practice works here.
* <p>
* This function translates all the long and short forms that a
* unit prefix can occur in and translates them into a single
* multiplier.
*
* @param units The units to compare the size to, using an
* EnumeratedAttribute.
*/
public void setUnits(ByteUnits units) {
int i = units.getIndex();
multiplier = 0;
if (i > -1 && i < 4) {
multiplier = 1000;
} else if (i > 3 && i < 9) {
multiplier = 1024;
} else if (i > 8 && i < 13) {
multiplier = 1000000;
} else if (i > 12 && i < 18) {
multiplier = 1048576;
} else if (i > 17 && i < 22) {
multiplier = 1000000000L;
} else if (i > 21 && i < 27) {
multiplier = 1073741824L;
} else if (i > 26 && i < 31) {
multiplier = 1000000000000L;
} else if (i > 30 && i < 36) {
multiplier = 1099511627776L;
}
if (multiplier > 0 && size > -1) {
sizelimit = size * multiplier;
}
}
/**
* This specifies when the file should be selected, whether it be
* when the file matches a particular size, when it is smaller,
* or whether it is larger.
*
* @param when The comparison to perform, an EnumeratedAttribute.
*/
public void setWhen(SizeComparisons when) {
this.when = when;
}
/**
* When using this as a custom selector, this method will be called.
* It translates each parameter into the appropriate setXXX() call.
*
* @param parameters the complete set of parameters for this selector.
*/
public void setParameters(Parameter[] parameters) {
super.setParameters(parameters);
if (parameters != null) {
for (int i = 0; i < parameters.length; i++) {
String paramname = parameters[i].getName();
if (SIZE_KEY.equalsIgnoreCase(paramname)) {
try {
setValue(new Long(parameters[i].getValue()
).longValue());
} catch (NumberFormatException nfe) {
setError("Invalid size setting "
+ parameters[i].getValue());
}
} else if (UNITS_KEY.equalsIgnoreCase(paramname)) {
ByteUnits units = new ByteUnits();
units.setValue(parameters[i].getValue());
setUnits(units);
} else if (WHEN_KEY.equalsIgnoreCase(paramname)) {
SizeComparisons scmp = new SizeComparisons();
scmp.setValue(parameters[i].getValue());
setWhen(scmp);
} else {
setError("Invalid parameter " + paramname);
}
}
}
}
/**
* <p>Checks to make sure all settings are kosher. In this case, it
* means that the size attribute has been set (to a positive value),
* that the multiplier has a valid setting, and that the size limit
* is valid. Since the latter is a calculated value, this can only
* fail due to a programming error.
* </p>
* <p>If a problem is detected, the setError() method is called.
* </p>
*/
public void verifySettings() {
if (size < 0) {
setError("The value attribute is required, and must be positive");
} else if (multiplier < 1) {
setError("Invalid Units supplied, must be K,Ki,M,Mi,G,Gi,T,or Ti");
} else if (sizelimit < 0) {
setError("Internal error: Code is not setting sizelimit correctly");
}
}
/**
* The heart of the matter. This is where the selector gets to decide
* on the inclusion of a file in a particular fileset.
*
* @param basedir A java.io.File object for the base directory.
* @param filename The name of the file to check.
* @param file A File object for this filename.
* @return whether the file should be selected or not.
*/
public boolean isSelected(File basedir, String filename, File file) {
// throw BuildException on error
validate();
// Directory size never selected for
if (file.isDirectory()) {
return true;
}
long diff = file.length() - sizelimit;
return when.evaluate(diff == 0 ? 0 : (int) (diff / Math.abs(diff)));
}
/**
* Enumerated attribute with the values for units.
* <p>
* This treats the standard SI units as representing powers of ten,
* as they should. If you want the powers of 2 that approximate
* the SI units, use the first two characters followed by a
* <code>bi</code>. So 1024 (2^10) becomes <code>kibi</code>,
* 1048576 (2^20) becomes <code>mebi</code>, 1073741824 (2^30)
* becomes <code>gibi</code>, and so on. The symbols are also
* accepted, and these are the first letter capitalized followed
* by an <code>i</code>. <code>Ki</code>, <code>Mi</code>,
* <code>Gi</code>, and so on. Capitalization variations on these
* are also accepted.
* <p>
* This binary prefix system is approved by the IEC and appears on
* its way for approval by other agencies, but it is not an SI
* standard. It disambiguates things for us, though.
*/
public static class ByteUnits extends EnumeratedAttribute {
/**
* @return the values as an array of strings
*/
public String[] getValues() {
return new String[]{"K", "k", "kilo", "KILO",
"Ki", "KI", "ki", "kibi", "KIBI",
"M", "m", "mega", "MEGA",
"Mi", "MI", "mi", "mebi", "MEBI",
"G", "g", "giga", "GIGA",
"Gi", "GI", "gi", "gibi", "GIBI",
"T", "t", "tera", "TERA",
/* You wish! */ "Ti", "TI", "ti", "tebi", "TEBI"
};
}
}
/**
* Enumerated attribute with the values for size comparison.
*/
public static class SizeComparisons extends Comparison {
}
}
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