/*******************************************************************************
 * Copyright (c) 2000, 2004 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 org.eclipse.jdt.core.dom;

import java.util.List;

/**
 * Static or instance initializer AST node type.
 * <pre>
 * Initializer:
 *     [ <b>static</b> ] Block
 * </pre>
 * 
 * @since 2.0
 */
public class Initializer extends BodyDeclaration {
	
	/**
	 * The "javadoc" structural property of this node type.
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor JAVADOC_PROPERTY = 
		internalJavadocPropertyFactory(Initializer.class);

	/**
	 * The "modifiers" structural property of this node type (JLS2 API only).
	 * @since 3.0
	 */
    // TODO (jeem) When JLS3 support is complete (post 3.0) - deprecated Replaced by {@link #MODIFIERS2_PROPERTY} in the JLS3 API.
	public static final SimplePropertyDescriptor MODIFIERS_PROPERTY = 
		internalModifiersPropertyFactory(Initializer.class);
	
	/**
	 * The "modifiers" structural property of this node type (added in JLS3 API).
	 * @since 3.0
	 */
	public static final ChildListPropertyDescriptor MODIFIERS2_PROPERTY = 
		internalModifiers2PropertyFactory(Initializer.class);
	
	/**
	 * The "body" structural property of this node type.
	 * @since 3.0
	 */
	public static final ChildPropertyDescriptor BODY_PROPERTY = 
		new ChildPropertyDescriptor(Initializer.class, "body", Block.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

	/**
	 * A list of property descriptors (element type: 
	 * {@link StructuralPropertyDescriptor}),
	 * or null if uninitialized.
	 * @since 3.0
	 */
	private static final List PROPERTY_DESCRIPTORS_2_0;
	
	/**
	 * A list of property descriptors (element type: 
	 * {@link StructuralPropertyDescriptor}),
	 * or null if uninitialized.
	 * @since 3.0
	 */
	private static final List PROPERTY_DESCRIPTORS_3_0;
	
	static {
		createPropertyList(Initializer.class);
		addProperty(JAVADOC_PROPERTY);
		addProperty(MODIFIERS_PROPERTY);
		addProperty(BODY_PROPERTY);
		PROPERTY_DESCRIPTORS_2_0 = reapPropertyList();
		
		createPropertyList(Initializer.class);
		addProperty(JAVADOC_PROPERTY);
		addProperty(MODIFIERS2_PROPERTY);
		addProperty(BODY_PROPERTY);
		PROPERTY_DESCRIPTORS_3_0 = reapPropertyList();
	}

	/**
	 * Returns a list of structural property descriptors for this node type.
	 * Clients must not modify the result.
	 * 
	 * @param apiLevel the API level; one of the
	 * <code>AST.JLS&ast;</code> constants

	 * @return a list of property descriptors (element type: 
	 * {@link StructuralPropertyDescriptor})
	 * @since 3.0
	 */
	public static List propertyDescriptors(int apiLevel) {
		if (apiLevel == AST.JLS2) {
			return PROPERTY_DESCRIPTORS_2_0;
		} else {
			return PROPERTY_DESCRIPTORS_3_0;
		}
	}
			
	/**
	 * The initializer body; lazily initialized; defaults to an empty block.
	 */
	private Block body = null;

	/**
	 * Creates a new AST node for an initializer declaration owned by the given 
	 * AST. By default, the initializer has no modifiers and an empty block.
	 * The javadoc comment is not used for initializers.
	 * <p>
	 * N.B. This constructor is package-private.
	 * </p>
	 * 
	 * @param ast the AST that is to own this node
	 */
	Initializer(AST ast) {
		super(ast);
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 * @since 3.0
	 */
	final List internalStructuralPropertiesForType(int apiLevel) {
		return propertyDescriptors(apiLevel);
	}
	
	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	final int internalGetSetIntProperty(SimplePropertyDescriptor property, boolean get, int value) {
		if (property == MODIFIERS_PROPERTY) {
			if (get) {
				return getModifiers();
			} else {
				setModifiers(value);
				return 0;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetIntProperty(property, get, value);
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
		if (property == JAVADOC_PROPERTY) {
			if (get) {
				return getJavadoc();
			} else {
				setJavadoc((Javadoc) child);
				return null;
			}
		}
		if (property == BODY_PROPERTY) {
			if (get) {
				return getBody();
			} else {
				setBody((Block) child);
				return null;
			}
		}
		// allow default implementation to flag the error
		return super.internalGetSetChildProperty(property, get, child);
	}
	
	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
		if (property == MODIFIERS2_PROPERTY) {
			return modifiers();
		}
		// allow default implementation to flag the error
		return super.internalGetChildListProperty(property);
	}
	
	/* (omit javadoc for this method)
	 * Method declared on BodyDeclaration.
	 */
	final ChildPropertyDescriptor internalJavadocProperty() {
		return JAVADOC_PROPERTY;
	}

	/* (omit javadoc for this method)
	 * Method declared on BodyDeclaration.
	 */
	final ChildListPropertyDescriptor internalModifiers2Property() {
		return MODIFIERS2_PROPERTY;
	}

	/* (omit javadoc for this method)
	 * Method declared on BodyDeclaration.
	 */
	final SimplePropertyDescriptor internalModifiersProperty() {
		return MODIFIERS_PROPERTY;
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	final int getNodeType0() {
		return INITIALIZER;
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	ASTNode clone0(AST target) {
		Initializer result = new Initializer(target);
		result.setSourceRange(this.getStartPosition(), this.getLength());
		if (this.ast.apiLevel == AST.JLS2) {
			result.setModifiers(getModifiers());
		}
		if (this.ast.apiLevel >= AST.JLS3) {
			result.modifiers().addAll(ASTNode.copySubtrees(target, modifiers()));
		}
		result.setJavadoc(
			(Javadoc) ASTNode.copySubtree(target, getJavadoc()));
		result.setBody((Block) getBody().clone(target));
		return result;
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	final boolean subtreeMatch0(ASTMatcher matcher, Object other) {
		// dispatch to correct overloaded match method
		return matcher.match(this, other);
	}

	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	void accept0(ASTVisitor visitor) {
		boolean visitChildren = visitor.visit(this);
		if (visitChildren) {
			acceptChild(visitor, getJavadoc());
			if (this.ast.apiLevel >= AST.JLS3) {
				acceptChildren(visitor, this.modifiers);
			}
			acceptChild(visitor, getBody());
		}
		visitor.endVisit(this);
	}
	
	/**
	 * Returns the body of this initializer declaration.
	 * 
	 * @return the initializer body
	 */ 
	public Block getBody() {
		if (this.body == null) {
			// lazy init must be thread-safe for readers
			synchronized (this) {
				if (this.body == null) {
					preLazyInit();
					this.body= new Block(this.ast);
					postLazyInit(this.body, BODY_PROPERTY);
				}
			}
		}
		return this.body;
	}
	
	/**
	 * Sets the body of this initializer declaration.
	 * 
	 * @param body the block node
	 * @exception IllegalArgumentException if:
	 * <ul>
	 * <li>the node belongs to a different AST</li>
	 * <li>the node already has a parent</li>
	 * <li>a cycle in would be created</li>
	 * </ul>
	 */ 
	public void setBody(Block body) {
		if (body == null) {
			throw new IllegalArgumentException();
		}
		ASTNode oldChild = this.body;
		preReplaceChild(oldChild, body, BODY_PROPERTY);
		this.body = body;
		postReplaceChild(oldChild, body, BODY_PROPERTY);
	}
	
	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	int memSize() {
		return super.memSize() + 1 * 4;
	}
	
	/* (omit javadoc for this method)
	 * Method declared on ASTNode.
	 */
	int treeSize() {
		return
			memSize()
			+ (this.optionalDocComment == null ? 0 : getJavadoc().treeSize())
			+ (this.modifiers == null ? 0 : this.modifiers.listSize())
			+ (this.body == null ? 0 : getBody().treeSize());
	}
}