org.netbeans.lib.profiler.heap.HprofProxy Maven / Gradle / Ivy

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/*
 * 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.netbeans.lib.profiler.heap;

import java.util.Iterator;
import java.util.Properties;


/**
 *
 * @author Tomas Hurka
 */
class HprofProxy {
    //~ Constructors -------------------------------------------------------------------------------------------------------------

    HprofProxy() {
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    static Properties getProperties(Instance propertiesInstance) {
        Instance defaultsObj = (Instance) propertiesInstance.getValueOfField("defaults"); // NOI18N
        ObjectArrayDump entriesObj = (ObjectArrayDump) propertiesInstance.getValueOfField("table"); // NOI18N
        Properties props;

        if (defaultsObj != null) {
            props = new Properties(getProperties(defaultsObj));
        } else {
            props = new Properties();
        }
        if (entriesObj != null) {
            return getPropertiesFromTable(entriesObj, props, "key", "value");   // NOI18N
        } else {    // JDK 9
            Instance map = (Instance) propertiesInstance.getValueOfField("map"); // NOI18N
            if (map != null) {
                entriesObj = (ObjectArrayDump) map.getValueOfField("table"); // NOI18N
                return getPropertiesFromTable(entriesObj, props, "key", "val"); // NOI18N
            } else {    // old Hashtable
                entriesObj = (ObjectArrayDump) propertiesInstance.getValueOfField("elementData"); // NOI18N
                if (entriesObj != null) {
                    return getPropertiesFromTable(entriesObj, props, "key", "value");   // NOI18N
                }
            }
        }
        return null;
    }

    private static Properties getPropertiesFromTable(ObjectArrayDump entriesObj, Properties props, String keyName, String valueName) {
        Iterator enIt = entriesObj.getValues().iterator();
        while (enIt.hasNext()) {
            Instance entry = (Instance) enIt.next();
            
            for (; entry != null; entry = (Instance) entry.getValueOfField("next")) { // NOI18N
                Instance key = (Instance) entry.getValueOfField(keyName);
                Instance val = (Instance) entry.getValueOfField(valueName);
                if (key != null) {
                    props.setProperty(getString(key), getString(val));
                }
            }
        }
        
        return props;
    }

    static String getString(Instance stringInstance) {
        if (stringInstance == null) {
            return "*null*"; // NOI18N
        }
        String className = stringInstance.getJavaClass().getName();
        if (String.class.getName().equals(className)) {
            Byte coder = (Byte) stringInstance.getValueOfField("coder"); // NOI18N
            PrimitiveArrayDump chars = (PrimitiveArrayDump) stringInstance.getValueOfField("value"); // NOI18N
            if (chars != null) {
                Integer offset = (Integer) stringInstance.getValueOfField("offset"); // NOI18N
                Integer len = (Integer) stringInstance.getValueOfField("count"); // NOI18N
                if (offset == null) {
                    offset = Integer.valueOf(0);
                }
                if (len == null) {
                    len = chars.getLength();
                }
                char[] charArr = getChars(chars, coder, offset.intValue(), len.intValue());

                return new String(charArr).intern();
            }
            return "*null*"; // NOI18N
        }
        // what? Non-string in system properties?
        return "*"+className+"#"+stringInstance.getInstanceNumber()+"*";  // NOI18N
    }

    private static char[] getChars(PrimitiveArrayDump chars, Byte coder, int offset, int len) {
        if (coder == null) {
            return chars.getChars(offset, len);
        }
        int cdr = coder.intValue();
        switch (cdr) {
            case 0: {
                char[] charArr = new char[len];
                byte[] bytes = chars.getBytes(offset, len);
                for (int i=0; i