/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * 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.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.parser.metadata;

import java.util.Arrays;
import java.util.ListIterator;
import java.util.NoSuchElementException;

import sun.evtracing.processing.MetadataStore;

class JavaStackData implements Iterable<JavaStackFrame> {
	public static final JavaStackData UNKNOWN = new JavaStackData(new long[0], new int[0], null);

	private final JavaMethod[] methods;
	private final int[] bcis;

	public JavaStackData(long[] methods, int[] bcis, MetadataStore metadataStore) {
		assert (methods.length == bcis.length);

		this.methods = new JavaMethod[methods.length];
		for (int i = 0; i < methods.length; i++) {
			this.methods[i] = metadataStore.getOrAddMethod(methods[i]);
		}
		this.bcis = Arrays.copyOf(bcis, bcis.length);
	}

	public int frameCount() {
		return methods.length;
	}

	public boolean hasMethodFromClassLoader(long classLoader) {
		return Arrays.stream(methods).anyMatch(m -> m.clazz().classLoader() == classLoader);
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		for (JavaStackFrame frame : this) {
			sb.append(frame.toString());
			sb.append(System.lineSeparator());
		}
		return sb.toString();
	}

	@Override
	public ListIterator<JavaStackFrame> iterator() {
		return new ListItr(0);
	}

	public ListIterator<JavaStackFrame> lastIterator() {
		return new ListItr(methods.length);
	}

	private class ListItr implements ListIterator<JavaStackFrame> {

		private int index;

		public ListItr(int index) {
			this.index = index;
		}

		@Override
		public boolean hasNext() {
			return (index < methods.length);
		}

		@Override
		public JavaStackFrame next() {
			if (!hasNext()) {
				throw new NoSuchElementException();
			}
			JavaStackFrame jsf = new JavaStackFrame(methods[index], bcis[index]);
			index++;
			return jsf;
		}

		@Override
		public boolean hasPrevious() {
			return (index > 0);
		}

		@Override
		public JavaStackFrame previous() {
			if (!hasPrevious()) {
				throw new NoSuchElementException();
			}
			index--;
			return new JavaStackFrame(methods[index], bcis[index]);
		}

		@Override
		public int nextIndex() {
			return index + 1;
		}

		@Override
		public int previousIndex() {
			return index - 1;
		}

		@Override
		public void remove() {
			throw new UnsupportedOperationException();
		}

		@Override
		public void set(JavaStackFrame e) {
			throw new UnsupportedOperationException();
		}

		@Override
		public void add(JavaStackFrame e) {
			throw new UnsupportedOperationException();
		}
	}

}