/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.jdt.internal.corext.refactoring.typeconstraints2;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jdt.internal.corext.refactoring.typeconstraints.types.TType;

public abstract class ConstraintVariable2 {

	public static final String TO_STRING= "toString"; //$NON-NLS-1$

	private Object[] fDatas;

	private TypeEquivalenceSet fTypeEquivalenceSet;

	protected final TType fType;

	/**
	 * @param type the type
	 */
	protected ConstraintVariable2(TType type) {
		fType= type;
	}

	public Object getData(String name) {
		if (fDatas == null) {
			return null;
		} else {
			for (int i= 0; i < fDatas.length; i+= 2) {
				String key= (String) fDatas[i];
				if (key.equals(name))
					return fDatas[i + 1];
			}
			return null;
		}
	}

	public TypeEquivalenceSet getTypeEquivalenceSet() {
		return fTypeEquivalenceSet;
	}

	/**
	 * @return the type binding, or <code>null</code> iff the type constraint variable has no type in the original source (e.g. {@link CollectionElementVariable2})
	 */
	public TType getType() {
		return fType;
	}

	public ITypeSet getTypeEstimate() {
		Assert.isNotNull(fTypeEquivalenceSet);
		return fTypeEquivalenceSet.getTypeEstimate();
	}

	public void setData(String name, Object data) {
		int index= 0;
		if (fDatas != null) {
			while (index < fDatas.length) {
				if (name.equals(fDatas[index]))
					break;
				index+= 2;
			}
		}
		if (data != null) { // add
			if (fDatas != null) {
				if (index == fDatas.length) {
					Object[] newTable= new Object[fDatas.length + 2];
					System.arraycopy(fDatas, 0, newTable, 0, fDatas.length);
					fDatas= newTable;
				}
			} else {
				fDatas= new Object[2];
			}
			fDatas[index]= name;
			fDatas[index + 1]= data;
		} else { // remove
			if (fDatas != null) {
				if (index != fDatas.length) {
					int length= fDatas.length - 2;
					if (length == 0) {
						fDatas= null;
					} else {
						Object[] newTable= new Object[length];
						System.arraycopy(fDatas, 0, newTable, 0, index);
						System.arraycopy(fDatas, index + 2, newTable, index, length - index);
						fDatas= newTable;
					}
				}
			}
		}
	}

	public void setTypeEquivalenceSet(TypeEquivalenceSet set) {
		fTypeEquivalenceSet= set;
	}

	@Override
	public String toString() {
		String toString= (String) getData(TO_STRING);
		if (toString != null)
			return toString;

		String name= getClass().getName();
		int dot= name.lastIndexOf('.');
		return name.substring(dot + 1) + ": " + (fType != null ? fType.getPrettySignature() : "<NONE>"); //$NON-NLS-1$ //$NON-NLS-2$
	}
}