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/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.runtime.atn;

import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.misc.MurmurHash;

/**
 * Implements the {@code pushMode} lexer action by calling
 * {@link Lexer#pushMode} with the assigned mode.
 *
 * @author Sam Harwell
 * @since 4.2
 */
public final class LexerPushModeAction implements LexerAction {
	private final int mode;

	/**
	 * Constructs a new {@code pushMode} action with the specified mode value.
	 * @param mode The mode value to pass to {@link Lexer#pushMode}.
	 */
	public LexerPushModeAction(int mode) {
		this.mode = mode;
	}

	/**
	 * Get the lexer mode this action should transition the lexer to.
	 *
	 * @return The lexer mode for this {@code pushMode} command.
	 */
	public int getMode() {
		return mode;
	}

	/**
	 * {@inheritDoc}
	 * @return This method returns {@link LexerActionType#PUSH_MODE}.
	 */
	@Override
	public LexerActionType getActionType() {
		return LexerActionType.PUSH_MODE;
	}

	/**
	 * {@inheritDoc}
	 * @return This method returns {@code false}.
	 */
	@Override
	public boolean isPositionDependent() {
		return false;
	}

	/**
	 * {@inheritDoc}
	 *
	 * 

This action is implemented by calling {@link Lexer#pushMode} with the * value provided by {@link #getMode}.

*/ @Override public void execute(Lexer lexer) { lexer.pushMode(mode); } @Override public int hashCode() { int hash = MurmurHash.initialize(); hash = MurmurHash.update(hash, getActionType().ordinal()); hash = MurmurHash.update(hash, mode); return MurmurHash.finish(hash, 2); } @Override public boolean equals(Object obj) { if (obj == this) { return true; } else if (!(obj instanceof LexerPushModeAction)) { return false; } return mode == ((LexerPushModeAction)obj).mode; } @Override public String toString() { return String.format("pushMode(%d)", mode); } }




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