/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.lir.phases;

import java.util.ArrayList;
import java.util.ListIterator;

Allows storing of arbitrary data.
/** * Allows storing of arbitrary data. */
public class GenericContext { private ArrayList<Object> context; public GenericContext() { context = null; } public <T> void contextAdd(T obj) { if (context == null) { context = new ArrayList<>(); } context.add(obj); } @SuppressWarnings("unchecked") public <T> T contextLookup(Class<T> clazz) { if (context != null) { for (Object e : context) { if (clazz.isInstance(e)) { return (T) e; } } } return null; } @SuppressWarnings("unchecked") public <T> T contextRemove(Class<T> clazz) { if (context != null) { ListIterator<Object> it = context.listIterator(); while (it.hasNext()) { Object e = it.next(); if (clazz.isInstance(e)) { // remove entry it.remove(); if (context.isEmpty()) { context = null; } return (T) e; } } } return null; } }