org.eclipse.jdt.core/dom/org/eclipse/jdt/core/dom/LambdaExpression.java - objectteams/org.eclipse.objectteams - Gitiles

 /*******************************************************************************
  * Copyright (c) 2013 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jdt.core.dom;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * Lambda expression AST node type (added in JLS8 API).
  * <pre>
  * LambdaExpression:
  *    Identifier <b>-></b> Body
  *    <b>(</b> [ Identifier { <b>,</b> Identifier } ] <b>)</b> <b>-></b> Body
  *    <b>(</b> [ FormalParameter { <b>,</b> FormalParameter } ] <b>)</b> <b>-></b> Body
  * </pre>
  *
  *<p>
  * The first two forms use {@link VariableDeclarationFragment} for the parameter or parameters,
  * while the third form uses {@link SingleVariableDeclaration}.</p>
  *<p>The Body can be either a {@link Block} or an {@link Expression}.</p>
  *
  * @since 3.10
  * @noinstantiate This class is not intended to be instantiated by clients
  */
 public class LambdaExpression extends Expression {

 	/**
 	 * The "parentheses" structural property of this node type (type: {@link Boolean}).
 	 * <p>
 	 * Note that parentheses are required unless {@link #parameters()} contains
 	 * just a single {@link VariableDeclarationFragment}.
 	 * ASTRewrite may ignore this property if necessary.
 	 * </p>
 	 */
 	public static final SimplePropertyDescriptor PARENTHESES_PROPERTY =
 		new SimplePropertyDescriptor(LambdaExpression.class, "parentheses", boolean.class, MANDATORY); //$NON-NLS-1$

 	/**
 	 * The "parameters" structural property of this node type (element type: {@link VariableDeclaration}).
 	 * <p>
 	 * Note that all elements must be of the same type, either all {@link SingleVariableDeclaration} or all {@link VariableDeclarationFragment}.
 	 * </p>
 	 */
 	public static final ChildListPropertyDescriptor PARAMETERS_PROPERTY =
 		new ChildListPropertyDescriptor(LambdaExpression.class, "parameters", VariableDeclaration.class, CYCLE_RISK); //$NON-NLS-1$

 	/**
 	 * The "body" structural property of this node type (child type: {@link ASTNode},
 	 * must be either a {@link Block} or an {@link Expression}).
 	 */
 	public static final ChildPropertyDescriptor BODY_PROPERTY =
 		new ChildPropertyDescriptor(LambdaExpression.class, "body", ASTNode.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

 	/**
 	 * A list of property descriptors (element type:
 	 * {@link StructuralPropertyDescriptor}),
 	 * or null if uninitialized.
 	 */
 	private static final List PROPERTY_DESCRIPTORS_8_0;

 	static {
 		List propertyList = new ArrayList(4);
 		createPropertyList(LambdaExpression.class, propertyList);
 		addProperty(PARENTHESES_PROPERTY, propertyList);
 		addProperty(PARAMETERS_PROPERTY, propertyList);
 		addProperty(BODY_PROPERTY, propertyList);
 		PROPERTY_DESCRIPTORS_8_0 = reapPropertyList(propertyList);
 	}

 	/**
 	 * 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 AST.JLS* constants
 	 * @return a list of property descriptors (element type:
 	 * {@link StructuralPropertyDescriptor})
 	 */
 	public static List propertyDescriptors(int apiLevel) {
 		return PROPERTY_DESCRIPTORS_8_0;
 	}

 	/**
 	 * Indicates whether parentheses are present or not.
 	 * Defaults to <code>true</code>.
 	 */
 	private boolean hasParentheses = true;

 	/**
 	 * The parameter declarations
 	 * (element type: {@link VariableDeclaration}).
 	 * Defaults to an empty list.
 	 */
 	private ASTNode.NodeList parameters =
 		new ASTNode.NodeList(PARAMETERS_PROPERTY);

 	/**
 	 * The method body.
 	 * The method body; lazily initialized, defaults to an empty Block.
 	 */
 	private ASTNode body = null;

 	/**
 	 * Creates a new AST node for a LambdaExpression declaration owned
 	 * by the given AST.
 	 * <p>
 	 * N.B. This constructor is package-private; all subclasses must be
 	 * declared in the same package; clients are unable to declare
 	 * additional subclasses.
 	 * </p>
 	 *
 	 * @param ast the AST that is to own this node
 	 */
 	LambdaExpression(AST ast) {
 		super(ast);
 		unsupportedIn2_3_4();
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	final List internalStructuralPropertiesForType(int apiLevel) {
 		return propertyDescriptors(apiLevel);
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	final boolean internalGetSetBooleanProperty(SimplePropertyDescriptor property, boolean get, boolean value) {
 		if (property == PARENTHESES_PROPERTY) {
 			if (get) {
 				return hasParentheses();
 			} else {
 				setParentheses(value);
 				return false;
 			}
 		}
 		// allow default implementation to flag the error
 		return super.internalGetSetBooleanProperty(property, get, value);
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
 		if (property == PARAMETERS_PROPERTY) {
 			return parameters();
 		}
 		// allow default implementation to flag the error
 		return super.internalGetChildListProperty(property);
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
 		if (property == BODY_PROPERTY) {
 			if (get) {
 				return getBody();
 			} else {
 				setBody( 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.
 	 */
 	@Override
 	final int getNodeType0() {
 		return LAMBDA_EXPRESSION;
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	ASTNode clone0(AST target) {
 		LambdaExpression result = new LambdaExpression(target);
 		result.setSourceRange(getStartPosition(), getLength());
 		result.setParentheses(hasParentheses());
 		result.parameters().addAll(ASTNode.copySubtrees(target, parameters()));
 		result.setBody(ASTNode.copySubtree(target, getBody()));
 		return result;
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	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.
 	 */
 	@Override
 	void accept0(ASTVisitor visitor) {
 		boolean visitChildren = visitor.visit(this);
 		if (visitChildren) {
 			// visit children in normal left to right reading order
 			acceptChildren(visitor, this.parameters);
 			acceptChild(visitor, getBody());
 		}
 		visitor.endVisit(this);
 	}

 	/**
 	 * Returns whether parentheses around the parameters are present or not.
 	 * <p>
 	 * Note that parentheses are required unless {@link #parameters()} contains
 	 * just a single {@link VariableDeclarationFragment}.
 	 * ASTRewrite may ignore this property if necessary.
 	 * </p>
 	 *
 	 * @return <code>true</code> if this lambda expression has parentheses around
 	 * its parameters and <code>false</code> otherwise
 	 */
 	public boolean hasParentheses() {
 		return this.hasParentheses;
 	}

 	/**
 	 * Sets whether this lambda expression has parentheses around its parameters or not.
 	 * <p>
 	 * Note that parentheses are required unless {@link #parameters()} contains
 	 * just a single {@link VariableDeclarationFragment}.
 	 * ASTRewrite may ignore this property if necessary.
 	 * </p>
 	 *
 	 * @param hasParentheses <code>true</code> if this lambda expression has parentheses around its parameters
 	 *  and <code>false</code> otherwise
 	 */
 	public void setParentheses(boolean hasParentheses) {
 		preValueChange(PARENTHESES_PROPERTY);
 		this.hasParentheses = hasParentheses;
 		postValueChange(PARENTHESES_PROPERTY);
 	}

 	/**
 	 * Returns the live ordered list of formal parameters of this lambda expression.
 	 * Note that all elements must be of the same type, either
 	 * <ul>
 	 * <li>all {@link SingleVariableDeclaration} (explicit type), or</li>
 	 * <li>all {@link VariableDeclarationFragment} (inferred type).</li>
 	 * </ul>
 	 *
 	 * @return the live list of formal parameters of this lambda expression
 	 *    (element type: {@link VariableDeclaration})
 	 */
 	public List parameters() {
 		return this.parameters;
 	}

 	/**
 	 * Returns the body of this lambda expression.
 	 *
 	 * @return the lambda expression body, which can be either a {@link Block} or an {@link Expression}
 	 */
 	public ASTNode 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 lambda expression.
 	 *
 	 * @param body a block node or an expression 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>
 	 * <li>body is neither a {@link Block} nor an {@link Expression}</li>
 	 * </ul>
 	 */
 	public void setBody(ASTNode body) {
 		if (!(body instanceof Expression || body instanceof Block)) {
 			throw new IllegalArgumentException();
 		}
 		ASTNode oldChild = this.body;
 		preReplaceChild(oldChild, body, BODY_PROPERTY);
 		this.body = body;
 		postReplaceChild(oldChild, body, BODY_PROPERTY);
 	}

 	/**
 	 * Resolves and returns the binding for the lambda expression
 	 * <p>
 	 * Note that bindings are generally unavailable unless requested when the
 	 * AST is being built.
 	 * </p>
 	 *
 	 * @return the binding, or <code>null</code> if the binding cannot be
 	 *    resolved
 	 */
 	public IMethodBinding resolveMethodBinding() {
 		return this.ast.getBindingResolver().resolveMethod(this);
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	int memSize() {
 		return BASE_NODE_SIZE + 3 * 4;
 	}

 	/* (omit javadoc for this method)
 	 * Method declared on ASTNode.
 	 */
 	@Override
 	int treeSize() {
 		return
 			memSize()
 			+ this.parameters.listSize()
 			+ (this.body == null ? 0 : getBody().treeSize());
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2013 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jdt.core.dom;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* Lambda expression AST node type (added in JLS8 API).
	* <pre>
	* LambdaExpression:
	* Identifier <b>-></b> Body
	* <b>(</b> [ Identifier { <b>,</b> Identifier } ] <b>)</b> <b>-></b> Body
	* <b>(</b> [ FormalParameter { <b>,</b> FormalParameter } ] <b>)</b> <b>-></b> Body
	* </pre>
	*
	*<p>
	* The first two forms use {@link VariableDeclarationFragment} for the parameter or parameters,
	* while the third form uses {@link SingleVariableDeclaration}.</p>
	*<p>The Body can be either a {@link Block} or an {@link Expression}.</p>
	*
	* @since 3.10
	* @noinstantiate This class is not intended to be instantiated by clients
	*/
	public class LambdaExpression extends Expression {

	/**
	* The "parentheses" structural property of this node type (type: {@link Boolean}).
	* <p>
	* Note that parentheses are required unless {@link #parameters()} contains
	* just a single {@link VariableDeclarationFragment}.
	* ASTRewrite may ignore this property if necessary.
	* </p>
	*/
	public static final SimplePropertyDescriptor PARENTHESES_PROPERTY =
	new SimplePropertyDescriptor(LambdaExpression.class, "parentheses", boolean.class, MANDATORY); //$NON-NLS-1$

	/**
	* The "parameters" structural property of this node type (element type: {@link VariableDeclaration}).
	* <p>
	* Note that all elements must be of the same type, either all {@link SingleVariableDeclaration} or all {@link VariableDeclarationFragment}.
	* </p>
	*/
	public static final ChildListPropertyDescriptor PARAMETERS_PROPERTY =
	new ChildListPropertyDescriptor(LambdaExpression.class, "parameters", VariableDeclaration.class, CYCLE_RISK); //$NON-NLS-1$

	/**
	* The "body" structural property of this node type (child type: {@link ASTNode},
	* must be either a {@link Block} or an {@link Expression}).
	*/
	public static final ChildPropertyDescriptor BODY_PROPERTY =
	new ChildPropertyDescriptor(LambdaExpression.class, "body", ASTNode.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$

	/**
	* A list of property descriptors (element type:
	* {@link StructuralPropertyDescriptor}),
	* or null if uninitialized.
	*/
	private static final List PROPERTY_DESCRIPTORS_8_0;

	static {
	List propertyList = new ArrayList(4);
	createPropertyList(LambdaExpression.class, propertyList);
	addProperty(PARENTHESES_PROPERTY, propertyList);
	addProperty(PARAMETERS_PROPERTY, propertyList);
	addProperty(BODY_PROPERTY, propertyList);
	PROPERTY_DESCRIPTORS_8_0 = reapPropertyList(propertyList);
	}

	/**
	* 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 AST.JLS* constants
	* @return a list of property descriptors (element type:
	* {@link StructuralPropertyDescriptor})
	*/
	public static List propertyDescriptors(int apiLevel) {
	return PROPERTY_DESCRIPTORS_8_0;
	}

	/**
	* Indicates whether parentheses are present or not.
	* Defaults to <code>true</code>.
	*/
	private boolean hasParentheses = true;

	/**
	* The parameter declarations
	* (element type: {@link VariableDeclaration}).
	* Defaults to an empty list.
	*/
	private ASTNode.NodeList parameters =
	new ASTNode.NodeList(PARAMETERS_PROPERTY);

	/**
	* The method body.
	* The method body; lazily initialized, defaults to an empty Block.
	*/
	private ASTNode body = null;

	/**
	* Creates a new AST node for a LambdaExpression declaration owned
	* by the given AST.
	* <p>
	* N.B. This constructor is package-private; all subclasses must be
	* declared in the same package; clients are unable to declare
	* additional subclasses.
	* </p>
	*
	* @param ast the AST that is to own this node
	*/
	LambdaExpression(AST ast) {
	super(ast);
	unsupportedIn2_3_4();
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	final List internalStructuralPropertiesForType(int apiLevel) {
	return propertyDescriptors(apiLevel);
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	final boolean internalGetSetBooleanProperty(SimplePropertyDescriptor property, boolean get, boolean value) {
	if (property == PARENTHESES_PROPERTY) {
	if (get) {
	return hasParentheses();
	} else {
	setParentheses(value);
	return false;
	}
	}
	// allow default implementation to flag the error
	return super.internalGetSetBooleanProperty(property, get, value);
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	final List internalGetChildListProperty(ChildListPropertyDescriptor property) {
	if (property == PARAMETERS_PROPERTY) {
	return parameters();
	}
	// allow default implementation to flag the error
	return super.internalGetChildListProperty(property);
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
	if (property == BODY_PROPERTY) {
	if (get) {
	return getBody();
	} else {
	setBody( 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.
	*/
	@Override
	final int getNodeType0() {
	return LAMBDA_EXPRESSION;
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	ASTNode clone0(AST target) {
	LambdaExpression result = new LambdaExpression(target);
	result.setSourceRange(getStartPosition(), getLength());
	result.setParentheses(hasParentheses());
	result.parameters().addAll(ASTNode.copySubtrees(target, parameters()));
	result.setBody(ASTNode.copySubtree(target, getBody()));
	return result;
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	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.
	*/
	@Override
	void accept0(ASTVisitor visitor) {
	boolean visitChildren = visitor.visit(this);
	if (visitChildren) {
	// visit children in normal left to right reading order
	acceptChildren(visitor, this.parameters);
	acceptChild(visitor, getBody());
	}
	visitor.endVisit(this);
	}

	/**
	* Returns whether parentheses around the parameters are present or not.
	* <p>
	* Note that parentheses are required unless {@link #parameters()} contains
	* just a single {@link VariableDeclarationFragment}.
	* ASTRewrite may ignore this property if necessary.
	* </p>
	*
	* @return <code>true</code> if this lambda expression has parentheses around
	* its parameters and <code>false</code> otherwise
	*/
	public boolean hasParentheses() {
	return this.hasParentheses;
	}

	/**
	* Sets whether this lambda expression has parentheses around its parameters or not.
	* <p>
	* Note that parentheses are required unless {@link #parameters()} contains
	* just a single {@link VariableDeclarationFragment}.
	* ASTRewrite may ignore this property if necessary.
	* </p>
	*
	* @param hasParentheses <code>true</code> if this lambda expression has parentheses around its parameters
	* and <code>false</code> otherwise
	*/
	public void setParentheses(boolean hasParentheses) {
	preValueChange(PARENTHESES_PROPERTY);
	this.hasParentheses = hasParentheses;
	postValueChange(PARENTHESES_PROPERTY);
	}

	/**
	* Returns the live ordered list of formal parameters of this lambda expression.
	* Note that all elements must be of the same type, either
	* <ul>
	* <li>all {@link SingleVariableDeclaration} (explicit type), or</li>
	* <li>all {@link VariableDeclarationFragment} (inferred type).</li>
	* </ul>
	*
	* @return the live list of formal parameters of this lambda expression
	* (element type: {@link VariableDeclaration})
	*/
	public List parameters() {
	return this.parameters;
	}

	/**
	* Returns the body of this lambda expression.
	*
	* @return the lambda expression body, which can be either a {@link Block} or an {@link Expression}
	*/
	public ASTNode 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 lambda expression.
	*
	* @param body a block node or an expression 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>
	* <li>body is neither a {@link Block} nor an {@link Expression}</li>
	* </ul>
	*/
	public void setBody(ASTNode body) {
	if (!(body instanceof Expression \|\| body instanceof Block)) {
	throw new IllegalArgumentException();
	}
	ASTNode oldChild = this.body;
	preReplaceChild(oldChild, body, BODY_PROPERTY);
	this.body = body;
	postReplaceChild(oldChild, body, BODY_PROPERTY);
	}

	/**
	* Resolves and returns the binding for the lambda expression
	* <p>
	* Note that bindings are generally unavailable unless requested when the
	* AST is being built.
	* </p>
	*
	* @return the binding, or <code>null</code> if the binding cannot be
	* resolved
	*/
	public IMethodBinding resolveMethodBinding() {
	return this.ast.getBindingResolver().resolveMethod(this);
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	int memSize() {
	return BASE_NODE_SIZE + 3 * 4;
	}

	/* (omit javadoc for this method)
	* Method declared on ASTNode.
	*/
	@Override
	int treeSize() {
	return
	memSize()
	+ this.parameters.listSize()
	+ (this.body == null ? 0 : getBody().treeSize());
	}
	}