Copyright (c) 2009 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
/*******************************************************************************
 * Copyright (c) 2009 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.core.search.matching;

import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.core.search.SearchPattern;
import org.eclipse.jdt.internal.compiler.ExtraFlags;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;

public class ConstructorDeclarationPattern extends ConstructorPattern {
	public int extraFlags;
	
	public int declaringTypeModifiers;
	public char[] declaringPackageName;
	
	public int modifiers;
	public char[] signature;
	public char[][] parameterTypes;
	public char[][] parameterNames;

public ConstructorDeclarationPattern(char[] declaringPackageName, char[] declaringSimpleName, int matchRule) {
	this(matchRule);
	this.declaringSimpleName = (this.isCaseSensitive || this.isCamelCase) ? declaringSimpleName : CharOperation.toLowerCase(declaringSimpleName);
	this.declaringPackageName = declaringPackageName;
	this.findDeclarations = true;
	this.findReferences = false;
	this.parameterCount = -1;
	this.mustResolve = false;
}

ConstructorDeclarationPattern(int matchRule) {
	super(matchRule);
}
@Override
public void decodeIndexKey(char[] key) {
	int last = key.length - 1;
	int slash = CharOperation.indexOf(SEPARATOR, key, 0);
	this.declaringSimpleName = CharOperation.subarray(key, 0, slash);
	
	int start = slash + 1;
	slash = CharOperation.indexOf(SEPARATOR, key, start);
	last = slash - 1;
	
	boolean isDefaultConstructor = key[last] == '#';
	if (isDefaultConstructor) {
		this.parameterCount = -1;
	} else {
		this.parameterCount = 0;
		int power = 1;
		for (int i = last; i >= start; i--) {
			if (i == last) {
				this.parameterCount = key[i] - '0';
			} else {
				power *= 10;
				this.parameterCount += power * (key[i] - '0');
			}
		}
	}
	
	slash = slash + 3;
	last = slash - 1;
	
	int typeModifiersWithExtraFlags = key[last-1] + (key[last]<<16);
	this.declaringTypeModifiers = decodeModifers(typeModifiersWithExtraFlags);
	this.extraFlags = decodeExtraFlags(typeModifiersWithExtraFlags);
	
	// initialize optional fields
	this.declaringPackageName = null;
	this.modifiers = 0;
	this.signature = null;
	this.parameterTypes = null;
	this.parameterNames = null;
	
	boolean isMemberType = (this.extraFlags & ExtraFlags.IsMemberType) != 0;
	
	if (!isMemberType) {
		start = slash + 1;
		if (this.parameterCount == -1) {
			slash = key.length;
			last = slash - 1;
		} else {
			slash = CharOperation.indexOf(SEPARATOR, key, start);
		}
		last = slash - 1;
		
		this.declaringPackageName = CharOperation.subarray(key, start, slash);
		
		start = slash + 1;
		if (this.parameterCount == 0) {
			slash = slash + 3;
			last = slash - 1;
			
			this.modifiers = key[last-1] + (key[last]<<16);
		} else if (this.parameterCount > 0){
			slash = CharOperation.indexOf(SEPARATOR, key, start);
			last = slash - 1;
			
			boolean hasParameterStoredAsSignature = (this.extraFlags & ExtraFlags.ParameterTypesStoredAsSignature) != 0;
			if (hasParameterStoredAsSignature) {
				this.signature  = CharOperation.subarray(key, start, slash);
				CharOperation.replace(this.signature , '\\', SEPARATOR);
			} else {
				this.parameterTypes = CharOperation.splitOn(PARAMETER_SEPARATOR, key, start, slash);
			}
			start = slash + 1;
			slash = CharOperation.indexOf(SEPARATOR, key, start);
			last = slash - 1;
			
			if (slash != start) {
				this.parameterNames = CharOperation.splitOn(PARAMETER_SEPARATOR, key, start, slash);
			}
			
			slash = slash + 3;
			last = slash - 1;
			
			this.modifiers = key[last-1] + (key[last]<<16);
		} else {
			this.modifiers = ClassFileConstants.AccPublic;
		}
	}
	
	removeInternalFlags(); // remove internal flags
}

@Override
public SearchPattern getBlankPattern() {
	return new ConstructorDeclarationPattern(R_EXACT_MATCH | R_CASE_SENSITIVE);
}
@Override
public char[][] getIndexCategories() {
	return DECL_CATEGORIES;
}
@Override
public boolean matchesDecodedKey(SearchPattern decodedPattern) {
	ConstructorDeclarationPattern pattern = (ConstructorDeclarationPattern) decodedPattern;
	
	// only top level types
	if ((pattern.extraFlags & ExtraFlags.IsMemberType) != 0) return false;
	
	// check package - exact match only
	if (this.declaringPackageName != null && !CharOperation.equals(this.declaringPackageName, pattern.declaringPackageName, true))
		return false;

	return (this.parameterCount == pattern.parameterCount || this.parameterCount == -1 || this.varargs)
		&& matchesName(this.declaringSimpleName, pattern.declaringSimpleName);
}
private void removeInternalFlags() {
	this.extraFlags = this.extraFlags & ~ExtraFlags.ParameterTypesStoredAsSignature; // ParameterTypesStoredAsSignature is an internal flags only used to decode key
}
}