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/**
 * This file is part of Eclipse Steady.
 *
 * Licensed 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved.
 */
package com.sap.psr.vulas.monitor;

import java.util.HashSet;
import java.util.Set;

import javassist.ClassPool;
import javassist.LoaderClassPath;

/**
 * Wraps a {@link ClassLoader} to facilitate the search of parent and child class loaders.
 * Specifically, {@link ClassLoader} does not allow navigating to the child class loader(s).
 */
public class Loader {
	private ClassLoader classLoader = null;
	private Loader parent = null;
	private Set childs = new HashSet();
	private ClassPool classPool = null;
	Loader(ClassLoader _loader) {
		this.classLoader = _loader;
	}
	/**
	 * 

Setter for the field parent.

* * @param _l a {@link com.sap.psr.vulas.monitor.Loader} object. */ public void setParent(Loader _l) { if(this.parent==null) this.parent = _l; if(!_l.getChilds().contains(this)) _l.addChild(this); } /** *

Getter for the field parent.

* * @return a {@link com.sap.psr.vulas.monitor.Loader} object. */ public Loader getParent() { return this.parent; } /** *

addChild.

* * @param _l a {@link com.sap.psr.vulas.monitor.Loader} object. */ public void addChild(Loader _l) { this.childs.add(_l); } /** {@inheritDoc} */ @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((classLoader == null) ? 0 : classLoader.hashCode()); return result; } /** {@inheritDoc} */ @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Loader other = (Loader) obj; if (classLoader == null) { if (other.classLoader != null) return false; } else if (!classLoader.equals(other.classLoader)) return false; return true; } /** *

Getter for the field childs.

* * @return a {@link java.util.Set} object. */ public Set getChilds() { return this.childs; } /** *

isLeaf.

* * @return a boolean. */ public boolean isLeaf() { return this.childs.size()==0; } /** *

isRoot.

* * @return a boolean. */ public boolean isRoot() { return this.parent==null; } /** *

getDepth.

* * @return a int. */ public int getDepth() { return (this.parent==null ? 0 : parent.getDepth()+1); } /** *

Getter for the field classLoader.

* * @return a {@link java.lang.ClassLoader} object. */ public ClassLoader getClassLoader() { return this.classLoader; } /** *

Getter for the field classPool.

* * @return a {@link javassist.ClassPool} object. */ public ClassPool getClassPool() { return this.classPool; } /** *

createClassPool.

* * @param _parent a {@link com.sap.psr.vulas.monitor.Loader} object. * @param _classloader a {@link java.lang.ClassLoader} object. */ public void createClassPool(Loader _parent, ClassLoader _classloader) { if(_parent==null) { this.classPool = new ClassPool(); } else { this.classPool = new ClassPool(_parent.getClassPool()); } this.classPool.appendClassPath(new LoaderClassPath(_classloader)); } /** *

toString.

* * @return a {@link java.lang.String} object. */ public String toString() { final StringBuilder b = new StringBuilder(); b.append("Loader [classLoader=").append(this.classLoader.getClass().getName()); b.append(",hashCode=").append(this.classLoader.hashCode()); b.append(",#childs=").append(this.childs.size()); b.append(",depth=").append(this.getDepth()).append("]"); return b.toString(); } /** *

toJSON.

* * @return a {@link java.lang.String} object. */ public String toJSON() { StringBuilder b = new StringBuilder(); b.append(" { \"classLoader\" : \"").append(this.classLoader.getClass().getName()).append("\""); b.append(" , \"hashCode\" : \"").append(this.classLoader.hashCode()).append("\""); b.append(" , \"depth\" : \"").append(this.getDepth()).append("\" }"); return b.toString(); } }




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