/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpdt.internal.compiler.lookup;

import net.sourceforge.phpdt.core.compiler.CharOperation;
import net.sourceforge.phpdt.internal.compiler.impl.Constant;

public final class ArrayBinding extends TypeBinding {
	// creation and initialization of the length field
	// the declaringClass of this field is intentionally set to null so it can
	// be distinguished.
	public static final FieldBinding LengthField = new FieldBinding(LENGTH,
			IntBinding, AccPublic | AccFinal, null, Constant.NotAConstant);

	public TypeBinding leafComponentType;

	public int dimensions;

	char[] constantPoolName;

	public ArrayBinding(TypeBinding type, int dimensions) {
		this.tagBits |= IsArrayType;
		this.leafComponentType = type;
		this.dimensions = dimensions;
	}

	/*
	 * Answer the receiver's constant pool name.
	 * 
	 * NOTE: This method should only be used during/after code gen.
	 */

	public char[] constantPoolName() /* [Ljava/lang/Object; */{
		if (constantPoolName != null)
			return constantPoolName;

		char[] brackets = new char[dimensions];
		for (int i = dimensions - 1; i >= 0; i--)
			brackets[i] = '[';
		return constantPoolName = CharOperation.concat(brackets,
				leafComponentType.signature());
	}

	String debugName() {
		StringBuffer brackets = new StringBuffer(dimensions * 2);
		for (int i = dimensions; --i >= 0;)
			brackets.append("[]"); //$NON-NLS-1$
		return leafComponentType.debugName() + brackets.toString();
	}

	public int dimensions() {
		return this.dimensions;
	}

	/*
	 * Answer an array whose dimension size is one less than the receiver.
	 * 
	 * When the receiver's dimension size is one then answer the leaf component
	 * type.
	 */

	public TypeBinding elementsType(Scope scope) {
		if (dimensions == 1)
			return leafComponentType;
		else
			return scope.createArray(leafComponentType, dimensions - 1);
	}

	public PackageBinding getPackage() {
		return leafComponentType.getPackage();
	}

	/*
	 * Answer true if the receiver type can be assigned to the argument type
	 * (right)
	 */

	public boolean isCompatibleWith(TypeBinding right) {
		if (this == right)
			return true;

		char[][] rightName;
		if (right.isArrayType()) {
			ArrayBinding rightArray = (ArrayBinding) right;
			if (rightArray.leafComponentType.isBaseType())
				return false; // relying on the fact that all equal arrays are
								// identical
			if (dimensions == rightArray.dimensions)
				return leafComponentType
						.isCompatibleWith(rightArray.leafComponentType);
			if (dimensions < rightArray.dimensions)
				return false; // cannot assign 'String[]' into 'Object[][]'
								// but can assign 'byte[][]' into 'Object[]'
			rightName = ((ReferenceBinding) rightArray.leafComponentType).compoundName;
		} else {
			if (right.isBaseType())
				return false;
			rightName = ((ReferenceBinding) right).compoundName;
		}
		// Check dimensions - Java does not support explicitly sized dimensions
		// for types.
		// However, if it did, the type checking support would go here.

		if (CharOperation.equals(rightName, JAVA_LANG_OBJECT))
			return true;
		if (CharOperation.equals(rightName, JAVA_LANG_CLONEABLE))
			return true;
		if (CharOperation.equals(rightName, JAVA_IO_SERIALIZABLE))
			return true;
		return false;
	}

	public TypeBinding leafComponentType() {
		return leafComponentType;
	}

	/*
	 * API Answer the problem id associated with the receiver. NoError if the
	 * receiver is a valid binding.
	 */

	public int problemId() {
		return leafComponentType.problemId();
	}

	/**
	 * Answer the source name for the type. In the case of member types, as the
	 * qualified name from its top level type. For example, for a member type N
	 * defined inside M & A: "A.M.N".
	 */

	public char[] qualifiedSourceName() {
		char[] brackets = new char[dimensions * 2];
		for (int i = dimensions * 2 - 1; i >= 0; i -= 2) {
			brackets[i] = ']';
			brackets[i - 1] = '[';
		}
		return CharOperation.concat(leafComponentType.qualifiedSourceName(),
				brackets);
	}

	public char[] readableName() /* java.lang.Object[] */{
		char[] brackets = new char[dimensions * 2];
		for (int i = dimensions * 2 - 1; i >= 0; i -= 2) {
			brackets[i] = ']';
			brackets[i - 1] = '[';
		}
		return CharOperation.concat(leafComponentType.readableName(), brackets);
	}

	public char[] shortReadableName() {
		char[] brackets = new char[dimensions * 2];
		for (int i = dimensions * 2 - 1; i >= 0; i -= 2) {
			brackets[i] = ']';
			brackets[i - 1] = '[';
		}
		return CharOperation.concat(leafComponentType.shortReadableName(),
				brackets);
	}

	public char[] sourceName() {
		char[] brackets = new char[dimensions * 2];
		for (int i = dimensions * 2 - 1; i >= 0; i -= 2) {
			brackets[i] = ']';
			brackets[i - 1] = '[';
		}
		return CharOperation.concat(leafComponentType.sourceName(), brackets);
	}

	public String toString() {
		return leafComponentType != null ? debugName() : "NULL TYPE ARRAY"; //$NON-NLS-1$
	}
}