com.facebook.presto.jdbc.internal.jol.info.ClassData Maven / Gradle / Ivy
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/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.facebook.presto.jdbc.internal.jol.info;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* Holds the class data, without the layout information.
*
* @author Aleksey Shipilev
* @see org.openjdk.jol.layouters.Layouter
*/
public class ClassData {
/**
* Parse the existing instance.
*
* @param o object instance to parse
* @return class data instance
*/
public static ClassData parseInstance(Object o) {
Class k = o.getClass();
if (k.isArray()) {
if (k == byte[].class) return parseArray(k, ((byte[]) o).length);
if (k == boolean[].class) return parseArray(k, ((boolean[]) o).length);
if (k == short[].class) return parseArray(k, ((short[]) o).length);
if (k == char[].class) return parseArray(k, ((char[]) o).length);
if (k == int[].class) return parseArray(k, ((int[]) o).length);
if (k == float[].class) return parseArray(k, ((float[]) o).length);
if (k == double[].class) return parseArray(k, ((double[]) o).length);
if (k == long[].class) return parseArray(k, ((long[]) o).length);
return parseArray(k, ((Object[]) o).length);
}
return parseClass(k);
}
/**
* Simulate the array instance.
*
* @param arrayClass array class, e.g. int[].class
* @param length array length
* @return class data instance
*/
public static ClassData parseArray(Class arrayClass, int length) {
return new ClassData(arrayClass.getName(), arrayClass.getComponentType().getName(), length);
}
/**
* Parse the existing class.
*
* @param klass class to parse
* @return class data instance
*/
public static ClassData parseClass(Class klass) {
ClassData cd = new ClassData(klass.getCanonicalName());
do {
for (Field f : klass.getDeclaredFields()) {
if (!Modifier.isStatic(f.getModifiers())) {
cd.addField(FieldData.parse(f));
}
}
cd.addSuperClass(klass.getSimpleName());
} while ((klass = klass.getSuperclass()) != null);
return cd;
}
private final String name;
private final List fields;
private final List classNames;
private final String arrayKlass;
private final String arrayComponentKlass;
private final int length;
private final boolean isArray;
/**
* Constructs the empty ClassData, suited for regular class.
*/
public ClassData(String name) {
this.name = name;
this.fields = new ArrayList();
this.classNames = new ArrayList();
this.length = -1;
this.arrayKlass = null;
this.arrayComponentKlass = null;
this.isArray = false;
}
/**
* Constructs the empty ClassData, suited for arrays.
*
* @param arrayKlass array class, e.g. "int[]"
* @param componentKlass, e.g. "int"
* @param length array length
*/
public ClassData(String arrayKlass, String componentKlass, int length) {
this.name = arrayKlass;
this.arrayKlass = arrayKlass;
this.arrayComponentKlass = componentKlass;
this.fields = null;
this.classNames = null;
this.length = length;
this.isArray = true;
}
/**
* Add the super-class into the hierarchy.
*
* @param superClass super class name
*/
public void addSuperClass(String superClass) {
classNames.add(0, superClass);
}
/**
* Add the field data.
*
* @param fieldData the data to add
*/
public void addField(FieldData fieldData) {
fields.add(fieldData);
}
/**
* Get the fields' data, including all the fields
* in the hierarchy.
*
* @return field data
*/
public Collection fields() {
return Collections.unmodifiableList(fields);
}
/**
* Get the fields' data for the given class.
*
* @param klass class name
* @return field data
*/
public Collection fieldsFor(String klass) {
List r = new ArrayList();
for (FieldData f : fields) {
if (f.hostClass().equals(klass)) {
r.add(f);
}
}
return r;
}
/**
* Get the class names in the hierarchy,
* starting from the superclasses down to subclasses
*
* @return list of class names
*/
public List classHierarchy() {
return Collections.unmodifiableList(classNames);
}
/**
* Answer class name
*
* @return string representation of class name
*/
public String name() {
return name;
}
/**
* Is this class data for the array?
*
* @return true, if class data represents the array; false otherwise
*/
public boolean isArray() {
return isArray;
}
/**
* Answer the array class for this class data.
*
* @return array class name, e.g. "int[]".
*/
public String arrayClass() {
if (!isArray) {
throw new IllegalStateException("Asking array class for non-array ClassData");
}
return arrayKlass;
}
/**
* Answer the array component class for this class data.
*
* @return array component class name, e.g. "int" for int[] array.
*/
public String arrayComponentType() {
if (!isArray) {
throw new IllegalStateException("Asking array component type for non-array ClassData");
}
return arrayComponentKlass;
}
/**
* Answer the array length for this class data.
*
* @return array length
*/
public int arrayLength() {
if (!isArray) {
throw new IllegalStateException("Asking array length for non-array ClassData");
}
return length;
}
/**
* Merge this class data with the super-class class data
*
* @param superClassData super class data
*/
public void merge(ClassData superClassData) {
fields.addAll(superClassData.fields);
classNames.addAll(0, superClassData.classNames);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ClassData classData = (ClassData) o;
if (isArray != classData.isArray) return false;
if (length != classData.length) return false;
if (arrayComponentKlass != null ? !arrayComponentKlass.equals(classData.arrayComponentKlass) : classData.arrayComponentKlass != null)
return false;
if (arrayKlass != null ? !arrayKlass.equals(classData.arrayKlass) : classData.arrayKlass != null) return false;
if (classNames != null ? !classNames.equals(classData.classNames) : classData.classNames != null) return false;
if (fields != null ? !fields.equals(classData.fields) : classData.fields != null) return false;
return true;
}
@Override
public int hashCode() {
int result = fields != null ? fields.hashCode() : 0;
result = 31 * result + (classNames != null ? classNames.hashCode() : 0);
result = 31 * result + (arrayKlass != null ? arrayKlass.hashCode() : 0);
result = 31 * result + (arrayComponentKlass != null ? arrayComponentKlass.hashCode() : 0);
result = 31 * result + length;
result = 31 * result + (isArray ? 1 : 0);
return result;
}
}
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